/drupal7/includes/common.inc - Club Drupal - Forge Centrale Marseille

root / drupal7 / includes / common.inc @ 2196f227

       <?php
       /**
        * @file
        * Common functions that many Drupal modules will need to reference.
+       *
        * The functions that are critical and need to be available even when serving
        * a cached page are instead located in bootstrap.inc.
        */
       /**
        * @defgroup php_wrappers PHP wrapper functions
        * @{
        * Functions that are wrappers or custom implementations of PHP functions.
+       *
        * Certain PHP functions should not be used in Drupal. Instead, Drupal's
        * replacement functions should be used.
+       *
        * For example, for improved or more secure UTF8-handling, or RFC-compliant
        * handling of URLs in Drupal.
+       *
        * For ease of use and memorizing, all these wrapper functions use the same name
        * as the original PHP function, but prefixed with "drupal_". Beware, however,
        * that not all wrapper functions support the same arguments as the original
        * functions.
+       *
        * You should always use these wrapper functions in your code.
+       *
        * Wrong:
        * @code
        *   $my_substring = substr($original_string, 0, 5);
        * @endcode
+       *
        * Correct:
        * @code
        *   $my_substring = drupal_substr($original_string, 0, 5);
        * @endcode
+       *
        * @}
        */
       /**
        * Return status for saving which involved creating a new item.
        */
       define('SAVED_NEW', 1);
       /**
        * Return status for saving which involved an update to an existing item.
        */
       define('SAVED_UPDATED', 2);
       /**
        * Return status for saving which deleted an existing item.
        */
       define('SAVED_DELETED', 3);
       /**
        * The default group for system CSS files added to the page.
        */
       define('CSS_SYSTEM', -100);
       /**
        * The default group for module CSS files added to the page.
        */
       define('CSS_DEFAULT', 0);
       /**
        * The default group for theme CSS files added to the page.
        */
       define('CSS_THEME', 100);
       /**
        * The default group for JavaScript and jQuery libraries added to the page.
        */
       define('JS_LIBRARY', -100);
       /**
        * The default group for module JavaScript code added to the page.
        */
       define('JS_DEFAULT', 0);
       /**
        * The default group for theme JavaScript code added to the page.
        */
       define('JS_THEME', 100);
       /**
        * Error code indicating that the request exceeded the specified timeout.
+       *
        * @see drupal_http_request()
        */
       define('HTTP_REQUEST_TIMEOUT', -1);
       /**
        * @defgroup block_caching Block Caching
        * @{
        * Constants that define each block's caching state.
+       *
        * Modules specify how their blocks can be cached in their hook_block_info()
        * implementations. Caching can be turned off (DRUPAL_NO_CACHE), managed by the
        * module declaring the block (DRUPAL_CACHE_CUSTOM), or managed by the core
        * Block module. If the Block module is managing the cache, you can specify that
        * the block is the same for every page and user (DRUPAL_CACHE_GLOBAL), or that
        * it can change depending on the page (DRUPAL_CACHE_PER_PAGE) or by user
        * (DRUPAL_CACHE_PER_ROLE or DRUPAL_CACHE_PER_USER). Page and user settings can
        * be combined with a bitwise-binary or operator; for example,
        * DRUPAL_CACHE_PER_ROLE | DRUPAL_CACHE_PER_PAGE means that the block can change
        * depending on the user role or page it is on.
+       *
        * The block cache is cleared in cache_clear_all(), and uses the same clearing
        * policy than page cache (node, comment, user, taxonomy added or updated...).
        * Blocks requiring more fine-grained clearing might consider disabling the
        * built-in block cache (DRUPAL_NO_CACHE) and roll their own.
+       *
        * Note that user 1 is excluded from block caching.
        */
       /**
        * The block should not get cached.
+       *
        * This setting should be used:
        * - For simple blocks (notably those that do not perform any db query), where
        *   querying the db cache would be more expensive than directly generating the
        *   content.
        * - For blocks that change too frequently.
        */
       define('DRUPAL_NO_CACHE', -1);
       /**
        * The block is handling its own caching in its hook_block_view().
+       *
        * This setting is useful when time based expiration is needed or a site uses a
        * node access which invalidates standard block cache.
        */
       define('DRUPAL_CACHE_CUSTOM', -2);
       /**
        * The block or element can change depending on the user's roles.
+       *
        * This is the default setting for blocks, used when the block does not specify
        * anything.
        */
       define('DRUPAL_CACHE_PER_ROLE', 0x0001);
       /**
        * The block or element can change depending on the user.
+       *
        * This setting can be resource-consuming for sites with large number of users,
        * and thus should only be used when DRUPAL_CACHE_PER_ROLE is not sufficient.
        */
       define('DRUPAL_CACHE_PER_USER', 0x0002);
       /**
        * The block or element can change depending on the page being viewed.
        */
       define('DRUPAL_CACHE_PER_PAGE', 0x0004);
       /**
        * The block or element is the same for every user and page that it is visible.
        */
       define('DRUPAL_CACHE_GLOBAL', 0x0008);
       /**
        * @} End of "defgroup block_caching".
        */
       /**
        * Adds content to a specified region.
+       *
        * @param $region
        *   Page region the content is added to.
        * @param $data
        *   Content to be added.
        */
       function drupal_add_region_content($region = NULL, $data = NULL) {
         static $content = array();
         if (isset($region) && isset($data)) {
           $content[$region][] = $data;
+        }
         return $content;
+      }
       /**
        * Gets assigned content for a given region.
+       *
        * @param $region
        *   A specified region to fetch content for. If NULL, all regions will be
        *   returned.
        * @param $delimiter
        *   Content to be inserted between imploded array elements.
        */
       function drupal_get_region_content($region = NULL, $delimiter = ' ') {
         $content = drupal_add_region_content();
         if (isset($region)) {
           if (isset($content[$region]) && is_array($content[$region])) {
             return implode($delimiter, $content[$region]);
+          }
+        }
         else {
           foreach (array_keys($content) as $region) {
             if (is_array($content[$region])) {
               $content[$region] = implode($delimiter, $content[$region]);
+            }
+          }
           return $content;
+        }
+      }
       /**
        * Gets the name of the currently active installation profile.
+       *
        * When this function is called during Drupal's initial installation process,
        * the name of the profile that's about to be installed is stored in the global
        * installation state. At all other times, the standard Drupal systems variable
        * table contains the name of the current profile, and we can call
        * variable_get() to determine what one is active.
+       *
        * @return $profile
        *   The name of the installation profile.
        */
       function drupal_get_profile() {
         global $install_state;
         if (isset($install_state['parameters']['profile'])) {
           $profile = $install_state['parameters']['profile'];
+        }
         else {
           $profile = variable_get('install_profile', 'standard');
+        }
         return $profile;
+      }
       /**
        * Sets the breadcrumb trail for the current page.
+       *
        * @param $breadcrumb
        *   Array of links, starting with "home" and proceeding up to but not including
        *   the current page.
        */
       function drupal_set_breadcrumb($breadcrumb = NULL) {
         $stored_breadcrumb = &drupal_static(__FUNCTION__);
         if (isset($breadcrumb)) {
           $stored_breadcrumb = $breadcrumb;
+        }
         return $stored_breadcrumb;
+      }
       /**
        * Gets the breadcrumb trail for the current page.
        */
       function drupal_get_breadcrumb() {
         $breadcrumb = drupal_set_breadcrumb();
         if (!isset($breadcrumb)) {
           $breadcrumb = menu_get_active_breadcrumb();
+        }
         return $breadcrumb;
+      }
       /**
        * Returns a string containing RDF namespace declarations for use in XML and
        * XHTML output.
        */
       function drupal_get_rdf_namespaces() {
         $xml_rdf_namespaces = array();
         // Serializes the RDF namespaces in XML namespace syntax.
         if (function_exists('rdf_get_namespaces')) {
           foreach (rdf_get_namespaces() as $prefix => $uri) {
             $xml_rdf_namespaces[] = 'xmlns:' . $prefix . '="' . $uri . '"';
+          }
+        }
         return count($xml_rdf_namespaces) ? "\n  " . implode("\n  ", $xml_rdf_namespaces) : '';
+      }
       /**
        * Adds output to the HEAD tag of the HTML page.
+       *
        * This function can be called as long as the headers aren't sent. Pass no
        * arguments (or NULL for both) to retrieve the currently stored elements.
+       *
        * @param $data
        *   A renderable array. If the '#type' key is not set then 'html_tag' will be
        *   added as the default '#type'.
        * @param $key
        *   A unique string key to allow implementations of hook_html_head_alter() to
        *   identify the element in $data. Required if $data is not NULL.
+       *
        * @return
        *   An array of all stored HEAD elements.
+       *
        * @see theme_html_tag()
        */
       function drupal_add_html_head($data = NULL, $key = NULL) {
         $stored_head = &drupal_static(__FUNCTION__);
         if (!isset($stored_head)) {
           // Make sure the defaults, including Content-Type, come first.
           $stored_head = _drupal_default_html_head();
+        }
         if (isset($data) && isset($key)) {
           if (!isset($data['#type'])) {
             $data['#type'] = 'html_tag';
+          }
           $stored_head[$key] = $data;
+        }
         return $stored_head;
+      }
       /**
        * Returns elements that are always displayed in the HEAD tag of the HTML page.
        */
       function _drupal_default_html_head() {
         // Add default elements. Make sure the Content-Type comes first because the
         // IE browser may be vulnerable to XSS via encoding attacks from any content
         // that comes before this META tag, such as a TITLE tag.
         $elements['system_meta_content_type'] = array(
           '#type' => 'html_tag',
           '#tag' => 'meta',
           '#attributes' => array(
             'http-equiv' => 'Content-Type',
             'content' => 'text/html; charset=utf-8',
           ),
           // Security: This always has to be output first.
           '#weight' => -1000,
         );
         // Show Drupal and the major version number in the META GENERATOR tag.
         // Get the major version.
         list($version, ) = explode('.', VERSION);
         $elements['system_meta_generator'] = array(
           '#type' => 'html_tag',
           '#tag' => 'meta',
           '#attributes' => array(
             'name' => 'Generator',
             'content' => 'Drupal ' . $version . ' (http://drupal.org)',
           ),
         );
         // Also send the generator in the HTTP header.
         $elements['system_meta_generator']['#attached']['drupal_add_http_header'][] = array('X-Generator', $elements['system_meta_generator']['#attributes']['content']);
         return $elements;
+      }
       /**
        * Retrieves output to be displayed in the HEAD tag of the HTML page.
        */
       function drupal_get_html_head() {
         $elements = drupal_add_html_head();
         drupal_alter('html_head', $elements);
         return drupal_render($elements);
+      }
       /**
        * Adds a feed URL for the current page.
+       *
        * This function can be called as long the HTML header hasn't been sent.
+       *
        * @param $url
        *   An internal system path or a fully qualified external URL of the feed.
        * @param $title
        *   The title of the feed.
        */
       function drupal_add_feed($url = NULL, $title = '') {
         $stored_feed_links = &drupal_static(__FUNCTION__, array());
         if (isset($url)) {
           $stored_feed_links[$url] = theme('feed_icon', array('url' => $url, 'title' => $title));
           drupal_add_html_head_link(array(
             'rel' => 'alternate',
             'type' => 'application/rss+xml',
             'title' => $title,
             // Force the URL to be absolute, for consistency with other <link> tags
             // output by Drupal.
             'href' => url($url, array('absolute' => TRUE)),
           ));
+        }
         return $stored_feed_links;
+      }
       /**
        * Gets the feed URLs for the current page.
+       *
        * @param $delimiter
        *   A delimiter to split feeds by.
        */
       function drupal_get_feeds($delimiter = "\n") {
         $feeds = drupal_add_feed();
         return implode($feeds, $delimiter);
+      }
       /**
        * @defgroup http_handling HTTP handling
        * @{
        * Functions to properly handle HTTP responses.
        */
       /**
        * Processes a URL query parameter array to remove unwanted elements.
+       *
        * @param $query
        *   (optional) An array to be processed. Defaults to $_GET.
        * @param $exclude
        *   (optional) A list of $query array keys to remove. Use "parent[child]" to
        *   exclude nested items. Defaults to array('q').
        * @param $parent
        *   Internal use only. Used to build the $query array key for nested items.
+       *
        * @return
        *   An array containing query parameters, which can be used for url().
        */
       function drupal_get_query_parameters(array $query = NULL, array $exclude = array('q'), $parent = '') {
         // Set defaults, if none given.
         if (!isset($query)) {
           $query = $_GET;
+        }
         // If $exclude is empty, there is nothing to filter.
         if (empty($exclude)) {
           return $query;
+        }
         elseif (!$parent) {
           $exclude = array_flip($exclude);
+        }
         $params = array();
         foreach ($query as $key => $value) {
           $string_key = ($parent ? $parent . '[' . $key . ']' : $key);
           if (isset($exclude[$string_key])) {
             continue;
+          }
           if (is_array($value)) {
             $params[$key] = drupal_get_query_parameters($value, $exclude, $string_key);
+          }
           else {
             $params[$key] = $value;
+          }
+        }
         return $params;
+      }
       /**
        * Splits a URL-encoded query string into an array.
+       *
        * @param $query
        *   The query string to split.
+       *
        * @return
        *   An array of URL decoded couples $param_name => $value.
        */
       function drupal_get_query_array($query) {
         $result = array();
         if (!empty($query)) {
           foreach (explode('&', $query) as $param) {
             $param = explode('=', $param, 2);
             $result[$param[0]] = isset($param[1]) ? rawurldecode($param[1]) : '';
+          }
+        }
         return $result;
+      }
       /**
        * Parses an array into a valid, rawurlencoded query string.
+       *
        * This differs from http_build_query() as we need to rawurlencode() (instead of
        * urlencode()) all query parameters.
+       *
        * @param $query
        *   The query parameter array to be processed, e.g. $_GET.
        * @param $parent
        *   Internal use only. Used to build the $query array key for nested items.
+       *
        * @return
        *   A rawurlencoded string which can be used as or appended to the URL query
        *   string.
+       *
        * @see drupal_get_query_parameters()
        * @ingroup php_wrappers
        */
       function drupal_http_build_query(array $query, $parent = '') {
         $params = array();
         foreach ($query as $key => $value) {
           $key = ($parent ? $parent . '[' . rawurlencode($key) . ']' : rawurlencode($key));
           // Recurse into children.
           if (is_array($value)) {
             $params[] = drupal_http_build_query($value, $key);
+          }
           // If a query parameter value is NULL, only append its key.
           elseif (!isset($value)) {
             $params[] = $key;
+          }
           else {
             // For better readability of paths in query strings, we decode slashes.
             $params[] = $key . '=' . str_replace('%2F', '/', rawurlencode($value));
+          }
+        }
         return implode('&', $params);
+      }
       /**
        * Prepares a 'destination' URL query parameter for use with drupal_goto().
+       *
        * Used to direct the user back to the referring page after completing a form.
        * By default the current URL is returned. If a destination exists in the
        * previous request, that destination is returned. As such, a destination can
        * persist across multiple pages.
+       *
        * @return
        *   An associative array containing the key:
        *   - destination: The path provided via the destination query string or, if
        *     not available, the current path.
+       *
        * @see current_path()
        * @see drupal_goto()
        */
       function drupal_get_destination() {
         $destination = &drupal_static(__FUNCTION__);
         if (isset($destination)) {
           return $destination;
+        }
         if (isset($_GET['destination'])) {
           $destination = array('destination' => $_GET['destination']);
+        }
         else {
           $path = $_GET['q'];
           $query = drupal_http_build_query(drupal_get_query_parameters());
           if ($query != '') {
             $path .= '?' . $query;
+          }
           $destination = array('destination' => $path);
+        }
         return $destination;
+      }
       /**
        * Parses a URL string into its path, query, and fragment components.
+       *
        * This function splits both internal paths like @code node?b=c#d @endcode and
        * external URLs like @code https://example.com/a?b=c#d @endcode into their
        * component parts. See
        * @link http://tools.ietf.org/html/rfc3986#section-3 RFC 3986 @endlink for an
        * explanation of what the component parts are.
+       *
        * Note that, unlike the RFC, when passed an external URL, this function
        * groups the scheme, authority, and path together into the path component.
+       *
        * @param string $url
        *   The internal path or external URL string to parse.
+       *
        * @return array
        *   An associative array containing:
        *   - path: The path component of $url. If $url is an external URL, this
        *     includes the scheme, authority, and path.
        *   - query: An array of query parameters from $url, if they exist.
        *   - fragment: The fragment component from $url, if it exists.
+       *
        * @see drupal_goto()
        * @see l()
        * @see url()
        * @see http://tools.ietf.org/html/rfc3986
+       *
        * @ingroup php_wrappers
        */
       function drupal_parse_url($url) {
         $options = array(
           'path' => NULL,
           'query' => array(),
           'fragment' => '',
         );
         // External URLs: not using parse_url() here, so we do not have to rebuild
         // the scheme, host, and path without having any use for it.
         if (strpos($url, '://') !== FALSE) {
           // Split off everything before the query string into 'path'.
           $parts = explode('?', $url);
           $options['path'] = $parts[0];
           // If there is a query string, transform it into keyed query parameters.
           if (isset($parts[1])) {
             $query_parts = explode('#', $parts[1]);
             parse_str($query_parts[0], $options['query']);
             // Take over the fragment, if there is any.
             if (isset($query_parts[1])) {
               $options['fragment'] = $query_parts[1];
+            }
+          }
+        }
         // Internal URLs.
         else {
           // parse_url() does not support relative URLs, so make it absolute. E.g. the
           // relative URL "foo/bar:1" isn't properly parsed.
           $parts = parse_url('http://example.com/' . $url);
           // Strip the leading slash that was just added.
           $options['path'] = substr($parts['path'], 1);
           if (isset($parts['query'])) {
             parse_str($parts['query'], $options['query']);
+          }
           if (isset($parts['fragment'])) {
             $options['fragment'] = $parts['fragment'];
+          }
+        }
         // The 'q' parameter contains the path of the current page if clean URLs are
         // disabled. It overrides the 'path' of the URL when present, even if clean
         // URLs are enabled, due to how Apache rewriting rules work.
         if (isset($options['query']['q'])) {
           $options['path'] = $options['query']['q'];
           unset($options['query']['q']);
+        }
         return $options;
+      }
       /**
        * Encodes a Drupal path for use in a URL.
+       *
        * For aesthetic reasons slashes are not escaped.
+       *
        * Note that url() takes care of calling this function, so a path passed to that
        * function should not be encoded in advance.
+       *
        * @param $path
        *   The Drupal path to encode.
        */
       function drupal_encode_path($path) {
         return str_replace('%2F', '/', rawurlencode($path));
+      }
       /**
        * Sends the user to a different page.
+       *
        * This issues an on-site HTTP redirect. The function makes sure the redirected
        * URL is formatted correctly.
+       *
        * Usually the redirected URL is constructed from this function's input
        * parameters. However you may override that behavior by setting a
        * destination in either the $_REQUEST-array (i.e. by using
        * the query string of an URI) This is used to direct the user back to
        * the proper page after completing a form. For example, after editing
        * a post on the 'admin/content'-page or after having logged on using the
        * 'user login'-block in a sidebar. The function drupal_get_destination()
        * can be used to help set the destination URL.
+       *
        * Drupal will ensure that messages set by drupal_set_message() and other
        * session data are written to the database before the user is redirected.
+       *
        * This function ends the request; use it instead of a return in your menu
        * callback.
+       *
        * @param $path
        *   (optional) A Drupal path or a full URL, which will be passed to url() to
        *   compute the redirect for the URL.
        * @param $options
        *   (optional) An associative array of additional URL options to pass to url().
        * @param $http_response_code
        *   (optional) The HTTP status code to use for the redirection, defaults to
        *   302. The valid values for 3xx redirection status codes are defined in
        *   @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3 RFC 2616 @endlink
        *   and the
        *   @link http://tools.ietf.org/html/draft-reschke-http-status-308-07 draft for the new HTTP status codes: @endlink
        *   - 301: Moved Permanently (the recommended value for most redirects).
        *   - 302: Found (default in Drupal and PHP, sometimes used for spamming search
        *     engines).
        *   - 303: See Other.
        *   - 304: Not Modified.
        *   - 305: Use Proxy.
        *   - 307: Temporary Redirect.
+       *
        * @see drupal_get_destination()
        * @see url()
        */
       function drupal_goto($path = '', array $options = array(), $http_response_code = 302) {
         // A destination in $_GET always overrides the function arguments.
         // We do not allow absolute URLs to be passed via $_GET, as this can be an attack vector.
         if (isset($_GET['destination']) && !url_is_external($_GET['destination'])) {
           $destination = drupal_parse_url($_GET['destination']);
           $path = $destination['path'];
           $options['query'] = $destination['query'];
           $options['fragment'] = $destination['fragment'];
+        }
         // In some cases modules call drupal_goto(current_path()). We need to ensure
         // that such a redirect is not to an external URL.
         if ($path === current_path() && empty($options['external']) && url_is_external($path)) {
           // Force url() to generate a non-external URL.
           $options['external'] = FALSE;
+        }
         drupal_alter('drupal_goto', $path, $options, $http_response_code);
         // The 'Location' HTTP header must be absolute.
         $options['absolute'] = TRUE;
         $url = url($path, $options);
         header('Location: ' . $url, TRUE, $http_response_code);
         // The "Location" header sends a redirect status code to the HTTP daemon. In
         // some cases this can be wrong, so we make sure none of the code below the
         // drupal_goto() call gets executed upon redirection.
         drupal_exit($url);
+      }
       /**
        * Delivers a "site is under maintenance" message to the browser.
+       *
        * Page callback functions wanting to report a "site offline" message should
        * return MENU_SITE_OFFLINE instead of calling drupal_site_offline(). However,
        * functions that are invoked in contexts where that return value might not
        * bubble up to menu_execute_active_handler() should call drupal_site_offline().
        */
       function drupal_site_offline() {
         drupal_deliver_page(MENU_SITE_OFFLINE);
+      }
       /**
        * Delivers a "page not found" error to the browser.
+       *
        * Page callback functions wanting to report a "page not found" message should
        * return MENU_NOT_FOUND instead of calling drupal_not_found(). However,
        * functions that are invoked in contexts where that return value might not
        * bubble up to menu_execute_active_handler() should call drupal_not_found().
        */
       function drupal_not_found() {
         drupal_deliver_page(MENU_NOT_FOUND);
+      }
       /**
        * Delivers an "access denied" error to the browser.
+       *
        * Page callback functions wanting to report an "access denied" message should
        * return MENU_ACCESS_DENIED instead of calling drupal_access_denied(). However,
        * functions that are invoked in contexts where that return value might not
        * bubble up to menu_execute_active_handler() should call
        * drupal_access_denied().
        */
       function drupal_access_denied() {
         drupal_deliver_page(MENU_ACCESS_DENIED);
+      }
       /**
        * Performs an HTTP request.
+       *
        * This is a flexible and powerful HTTP client implementation. Correctly
        * handles GET, POST, PUT or any other HTTP requests. Handles redirects.
+       *
        * @param $url
        *   A string containing a fully qualified URI.
        * @param array $options
        *   (optional) An array that can have one or more of the following elements:
        *   - headers: An array containing request headers to send as name/value pairs.
        *   - method: A string containing the request method. Defaults to 'GET'.
        *   - data: A string containing the request body, formatted as
        *     'param=value&param=value&...'; to generate this, use http_build_query().
        *     Defaults to NULL.
        *   - max_redirects: An integer representing how many times a redirect
        *     may be followed. Defaults to 3.
        *   - timeout: A float representing the maximum number of seconds the function
        *     call may take. The default is 30 seconds. If a timeout occurs, the error
        *     code is set to the HTTP_REQUEST_TIMEOUT constant.
        *   - context: A context resource created with stream_context_create().
+       *
        * @return object
        *   An object that can have one or more of the following components:
        *   - request: A string containing the request body that was sent.
        *   - code: An integer containing the response status code, or the error code
        *     if an error occurred.
        *   - protocol: The response protocol (e.g. HTTP/1.1 or HTTP/1.0).
        *   - status_message: The status message from the response, if a response was
        *     received.
        *   - redirect_code: If redirected, an integer containing the initial response
        *     status code.
        *   - redirect_url: If redirected, a string containing the URL of the redirect
        *     target.
        *   - error: If an error occurred, the error message. Otherwise not set.
        *   - headers: An array containing the response headers as name/value pairs.
        *     HTTP header names are case-insensitive (RFC 2616, section 4.2), so for
        *     easy access the array keys are returned in lower case.
        *   - data: A string containing the response body that was received.
+       *
        * @see http_build_query()
        */
       function drupal_http_request($url, array $options = array()) {
         // Allow an alternate HTTP client library to replace Drupal's default
         // implementation.
         $override_function = variable_get('drupal_http_request_function', FALSE);
         if (!empty($override_function) && function_exists($override_function)) {
           return $override_function($url, $options);
+        }
         $result = new stdClass();
         // Parse the URL and make sure we can handle the schema.
         $uri = @parse_url($url);
         if ($uri == FALSE) {
           $result->error = 'unable to parse URL';
           $result->code = -1001;
           return $result;
+        }
         if (!isset($uri['scheme'])) {
           $result->error = 'missing schema';
           $result->code = -1002;
           return $result;
+        }
         timer_start(__FUNCTION__);
         // Merge the default options.
         $options += array(
           'headers' => array(),
           'method' => 'GET',
           'data' => NULL,
           'max_redirects' => 3,
           'timeout' => 30.0,
           'context' => NULL,
         );
         // Merge the default headers.
         $options['headers'] += array(
           'User-Agent' => 'Drupal (+http://drupal.org/)',
         );
         // stream_socket_client() requires timeout to be a float.
         $options['timeout'] = (float) $options['timeout'];
         // Use a proxy if one is defined and the host is not on the excluded list.
         $proxy_server = variable_get('proxy_server', '');
         if ($proxy_server && _drupal_http_use_proxy($uri['host'])) {
           // Set the scheme so we open a socket to the proxy server.
           $uri['scheme'] = 'proxy';
           // Set the path to be the full URL.
           $uri['path'] = $url;
           // Since the URL is passed as the path, we won't use the parsed query.
           unset($uri['query']);
           // Add in username and password to Proxy-Authorization header if needed.
           if ($proxy_username = variable_get('proxy_username', '')) {
             $proxy_password = variable_get('proxy_password', '');
             $options['headers']['Proxy-Authorization'] = 'Basic ' . base64_encode($proxy_username . (!empty($proxy_password) ? ":" . $proxy_password : ''));
+          }
           // Some proxies reject requests with any User-Agent headers, while others
           // require a specific one.
           $proxy_user_agent = variable_get('proxy_user_agent', '');
           // The default value matches neither condition.
           if ($proxy_user_agent === NULL) {
             unset($options['headers']['User-Agent']);
+          }
           elseif ($proxy_user_agent) {
             $options['headers']['User-Agent'] = $proxy_user_agent;
+          }
+        }
         switch ($uri['scheme']) {
           case 'proxy':
             // Make the socket connection to a proxy server.
             $socket = 'tcp://' . $proxy_server . ':' . variable_get('proxy_port', 8080);
             // The Host header still needs to match the real request.
             $options['headers']['Host'] = $uri['host'];
             $options['headers']['Host'] .= isset($uri['port']) && $uri['port'] != 80 ? ':' . $uri['port'] : '';
             break;
           case 'http':
           case 'feed':
             $port = isset($uri['port']) ? $uri['port'] : 80;
             $socket = 'tcp://' . $uri['host'] . ':' . $port;
             // RFC 2616: "non-standard ports MUST, default ports MAY be included".
             // We don't add the standard port to prevent from breaking rewrite rules
             // checking the host that do not take into account the port number.
             $options['headers']['Host'] = $uri['host'] . ($port != 80 ? ':' . $port : '');
             break;
           case 'https':
             // Note: Only works when PHP is compiled with OpenSSL support.
             $port = isset($uri['port']) ? $uri['port'] : 443;
             $socket = 'ssl://' . $uri['host'] . ':' . $port;
             $options['headers']['Host'] = $uri['host'] . ($port != 443 ? ':' . $port : '');
             break;
           default:
             $result->error = 'invalid schema ' . $uri['scheme'];
             $result->code = -1003;
             return $result;
+        }
         if (empty($options['context'])) {
           $fp = @stream_socket_client($socket, $errno, $errstr, $options['timeout']);
+        }
         else {
           // Create a stream with context. Allows verification of a SSL certificate.
           $fp = @stream_socket_client($socket, $errno, $errstr, $options['timeout'], STREAM_CLIENT_CONNECT, $options['context']);
+        }
         // Make sure the socket opened properly.
         if (!$fp) {
           // When a network error occurs, we use a negative number so it does not
           // clash with the HTTP status codes.
           $result->code = -$errno;
           $result->error = trim($errstr) ? trim($errstr) : t('Error opening socket @socket', array('@socket' => $socket));
           // Mark that this request failed. This will trigger a check of the web
           // server's ability to make outgoing HTTP requests the next time that
           // requirements checking is performed.
           // See system_requirements().
           variable_set('drupal_http_request_fails', TRUE);
           return $result;
+        }
         // Construct the path to act on.
         $path = isset($uri['path']) ? $uri['path'] : '/';
         if (isset($uri['query'])) {
           $path .= '?' . $uri['query'];
+        }
         // Only add Content-Length if we actually have any content or if it is a POST
         // or PUT request. Some non-standard servers get confused by Content-Length in
         // at least HEAD/GET requests, and Squid always requires Content-Length in
         // POST/PUT requests.
         $content_length = strlen($options['data']);
         if ($content_length > 0 || $options['method'] == 'POST' || $options['method'] == 'PUT') {
           $options['headers']['Content-Length'] = $content_length;
+        }
         // If the server URL has a user then attempt to use basic authentication.
         if (isset($uri['user'])) {
           $options['headers']['Authorization'] = 'Basic ' . base64_encode($uri['user'] . (isset($uri['pass']) ? ':' . $uri['pass'] : ':'));
+        }
         // If the database prefix is being used by SimpleTest to run the tests in a copied
         // database then set the user-agent header to the database prefix so that any
         // calls to other Drupal pages will run the SimpleTest prefixed database. The
         // user-agent is used to ensure that multiple testing sessions running at the
         // same time won't interfere with each other as they would if the database
         // prefix were stored statically in a file or database variable.
         $test_info = &$GLOBALS['drupal_test_info'];
         if (!empty($test_info['test_run_id'])) {
           $options['headers']['User-Agent'] = drupal_generate_test_ua($test_info['test_run_id']);
+        }
         $request = $options['method'] . ' ' . $path . " HTTP/1.0\r\n";
         foreach ($options['headers'] as $name => $value) {
           $request .= $name . ': ' . trim($value) . "\r\n";
+        }
         $request .= "\r\n" . $options['data'];
         $result->request = $request;
         // Calculate how much time is left of the original timeout value.
         $timeout = $options['timeout'] - timer_read(__FUNCTION__) / 1000;
         if ($timeout > 0) {
           stream_set_timeout($fp, floor($timeout), floor(1000000 * fmod($timeout, 1)));
           fwrite($fp, $request);
+        }
         // Fetch response. Due to PHP bugs like http://bugs.php.net/bug.php?id=43782
         // and http://bugs.php.net/bug.php?id=46049 we can't rely on feof(), but
         // instead must invoke stream_get_meta_data() each iteration.
         $info = stream_get_meta_data($fp);
         $alive = !$info['eof'] && !$info['timed_out'];
         $response = '';
         while ($alive) {
           // Calculate how much time is left of the original timeout value.
           $timeout = $options['timeout'] - timer_read(__FUNCTION__) / 1000;
           if ($timeout <= 0) {
             $info['timed_out'] = TRUE;
             break;
+          }
           stream_set_timeout($fp, floor($timeout), floor(1000000 * fmod($timeout, 1)));
           $chunk = fread($fp, 1024);
           $response .= $chunk;
           $info = stream_get_meta_data($fp);
           $alive = !$info['eof'] && !$info['timed_out'] && $chunk;
+        }
         fclose($fp);
         if ($info['timed_out']) {
           $result->code = HTTP_REQUEST_TIMEOUT;
           $result->error = 'request timed out';
           return $result;
+        }
         // Parse response headers from the response body.
         // Be tolerant of malformed HTTP responses that separate header and body with
         // \n\n or \r\r instead of \r\n\r\n.
         list($response, $result->data) = preg_split("/\r\n\r\n|\n\n|\r\r/", $response, 2);
         $response = preg_split("/\r\n|\n|\r/", $response);
         // Parse the response status line.
         $response_status_array = _drupal_parse_response_status(trim(array_shift($response)));
         $result->protocol = $response_status_array['http_version'];
         $result->status_message = $response_status_array['reason_phrase'];
         $code = $response_status_array['response_code'];
         $result->headers = array();
         // Parse the response headers.
         while ($line = trim(array_shift($response))) {
           list($name, $value) = explode(':', $line, 2);
           $name = strtolower($name);
           if (isset($result->headers[$name]) && $name == 'set-cookie') {
             // RFC 2109: the Set-Cookie response header comprises the token Set-
             // Cookie:, followed by a comma-separated list of one or more cookies.
             $result->headers[$name] .= ',' . trim($value);
+          }
           else {
             $result->headers[$name] = trim($value);
+          }
+        }
         $responses = array(
 => 'Continue',
 => 'Switching Protocols',
 => 'OK',
 => 'Created',
 => 'Accepted',
 => 'Non-Authoritative Information',
 => 'No Content',
 => 'Reset Content',
 => 'Partial Content',
 => 'Multiple Choices',
 => 'Moved Permanently',
 => 'Found',
 => 'See Other',
 => 'Not Modified',
 => 'Use Proxy',
 => 'Temporary Redirect',
 => 'Bad Request',
 => 'Unauthorized',
 => 'Payment Required',
 => 'Forbidden',
 => 'Not Found',
 => 'Method Not Allowed',
 => 'Not Acceptable',
 => 'Proxy Authentication Required',
 => 'Request Time-out',
 => 'Conflict',
 => 'Gone',
 => 'Length Required',
 => 'Precondition Failed',
 => 'Request Entity Too Large',
 => 'Request-URI Too Large',
 => 'Unsupported Media Type',
 => 'Requested range not satisfiable',
 => 'Expectation Failed',
 => 'Internal Server Error',
 => 'Not Implemented',
 => 'Bad Gateway',
 => 'Service Unavailable',
 => 'Gateway Time-out',
 => 'HTTP Version not supported',
         );
         // RFC 2616 states that all unknown HTTP codes must be treated the same as the
         // base code in their class.
         if (!isset($responses[$code])) {
           $code = floor($code / 100) * 100;
+        }
         $result->code = $code;
         switch ($code) {
           case 200: // OK
           case 201: // Created
           case 202: // Accepted
           case 203: // Non-Authoritative Information
           case 204: // No Content
           case 205: // Reset Content
           case 206: // Partial Content
           case 304: // Not modified
             break;
           case 301: // Moved permanently
           case 302: // Moved temporarily
           case 307: // Moved temporarily
             $location = $result->headers['location'];
             $options['timeout'] -= timer_read(__FUNCTION__) / 1000;
             if ($options['timeout'] <= 0) {
               $result->code = HTTP_REQUEST_TIMEOUT;
               $result->error = 'request timed out';
+            }
             elseif ($options['max_redirects']) {
               // Redirect to the new location.
               $options['max_redirects']--;
               $result = drupal_http_request($location, $options);
               $result->redirect_code = $code;
+            }
             if (!isset($result->redirect_url)) {
               $result->redirect_url = $location;
+            }
             break;
           default:
             $result->error = $result->status_message;
+        }
         return $result;
+      }
       /**
        * Splits an HTTP response status line into components.
+       *
        * See the @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html status line definition @endlink
        * in RFC 2616.
+       *
        * @param string $respone
        *   The response status line, for example 'HTTP/1.1 500 Internal Server Error'.
+       *
        * @return array
        *   Keyed array containing the component parts. If the response is malformed,
        *   all possible parts will be extracted. 'reason_phrase' could be empty.
        *   Possible keys:
        *   - 'http_version'
        *   - 'response_code'
        *   - 'reason_phrase'
        */
       function _drupal_parse_response_status($response) {
         $response_array = explode(' ', trim($response), 3);
         // Set up empty values.
         $result = array(
           'reason_phrase' => '',
         );
         $result['http_version'] = $response_array[0];
         $result['response_code'] = $response_array[1];
         if (isset($response_array[2])) {
           $result['reason_phrase'] = $response_array[2];
+        }
         return $result;
+      }
       /**
        * Helper function for determining hosts excluded from needing a proxy.
+       *
        * @return
        *   TRUE if a proxy should be used for this host.
        */
       function _drupal_http_use_proxy($host) {
         $proxy_exceptions = variable_get('proxy_exceptions', array('localhost', '127.0.0.1'));
         return !in_array(strtolower($host), $proxy_exceptions, TRUE);
+      }
       /**
        * @} End of "HTTP handling".
        */
       /**
        * Strips slashes from a string or array of strings.
+       *
        * Callback for array_walk() within fix_gpx_magic().
+       *
        * @param $item
        *   An individual string or array of strings from superglobals.
        */
       function _fix_gpc_magic(&$item) {
         if (is_array($item)) {
           array_walk($item, '_fix_gpc_magic');
+        }
         else {
           $item = stripslashes($item);
+        }
+      }
       /**
        * Strips slashes from $_FILES items.
+       *
        * Callback for array_walk() within fix_gpc_magic().
+       *
        * The tmp_name key is skipped keys since PHP generates single backslashes for
        * file paths on Windows systems.
+       *
        * @param $item
        *   An item from $_FILES.
        * @param $key
        *   The key for the item within $_FILES.
+       *
        * @see http://php.net/manual/features.file-upload.php#42280
        */
       function _fix_gpc_magic_files(&$item, $key) {
         if ($key != 'tmp_name') {
           if (is_array($item)) {
             array_walk($item, '_fix_gpc_magic_files');
+          }
           else {
             $item = stripslashes($item);
+          }
+        }
+      }
       /**
        * Fixes double-escaping caused by "magic quotes" in some PHP installations.
+       *
        * @see _fix_gpc_magic()
        * @see _fix_gpc_magic_files()
        */
       function fix_gpc_magic() {
         static $fixed = FALSE;
         if (!$fixed && ini_get('magic_quotes_gpc')) {
           array_walk($_GET, '_fix_gpc_magic');
           array_walk($_POST, '_fix_gpc_magic');
           array_walk($_COOKIE, '_fix_gpc_magic');
           array_walk($_REQUEST, '_fix_gpc_magic');
           array_walk($_FILES, '_fix_gpc_magic_files');
+        }
         $fixed = TRUE;
+      }
       /**
        * @defgroup validation Input validation
        * @{
        * Functions to validate user input.
        */
       /**
        * Verifies the syntax of the given e-mail address.
+       *
        * This uses the
        * @link http://php.net/manual/filter.filters.validate.php PHP e-mail validation filter. @endlink
+       *
        * @param $mail
        *   A string containing an e-mail address.
+       *
        * @return
        *   TRUE if the address is in a valid format.
        */
       function valid_email_address($mail) {
         return (bool)filter_var($mail, FILTER_VALIDATE_EMAIL);
+      }
       /**
        * Verifies the syntax of the given URL.
+       *
        * This function should only be used on actual URLs. It should not be used for
        * Drupal menu paths, which can contain arbitrary characters.
        * Valid values per RFC 3986.
        * @param $url
        *   The URL to verify.
        * @param $absolute
        *   Whether the URL is absolute (beginning with a scheme such as "http:").
+       *
        * @return
        *   TRUE if the URL is in a valid format.
        */
       function valid_url($url, $absolute = FALSE) {
         if ($absolute) {
           return (bool)preg_match("
             /^                                                      # Start at the beginning of the text
             (?:ftp|https?|feed):\/\/                                # Look for ftp, http, https or feed schemes
             (?:                                                     # Userinfo (optional) which is typically
               (?:(?:[\w\.\-\+!$&'\(\)*\+,;=]|%[0-9a-f]{2})+:)*      # a username or a username and password
               (?:[\w\.\-\+%!$&'\(\)*\+,;=]|%[0-9a-f]{2})+@          # combination
             )?
             (?:
               (?:[a-z0-9\-\.]|%[0-9a-f]{2})+                        # A domain name or a IPv4 address
               |(?:\[(?:[0-9a-f]{0,4}:)*(?:[0-9a-f]{0,4})\])         # or a well formed IPv6 address
+            )
             (?::[0-9]+)?                                            # Server port number (optional)
             (?:[\/|\?]
               (?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2})   # The path and query (optional)
             *)?
           $/xi", $url);
+        }
         else {
           return (bool)preg_match("/^(?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2})+$/i", $url);
+        }
+      }
       /**
        * @} End of "defgroup validation".
        */
       /**
        * Registers an event for the current visitor to the flood control mechanism.
+       *
        * @param $name
        *   The name of an event.
        * @param $window
        *   Optional number of seconds before this event expires. Defaults to 3600 (1
        *   hour). Typically uses the same value as the flood_is_allowed() $window
        *   parameter. Expired events are purged on cron run to prevent the flood table
        *   from growing indefinitely.
        * @param $identifier
        *   Optional identifier (defaults to the current user's IP address).
        */
       function flood_register_event($name, $window = 3600, $identifier = NULL) {
         if (!isset($identifier)) {
           $identifier = ip_address();
+        }
         db_insert('flood')
           ->fields(array(
             'event' => $name,
             'identifier' => $identifier,
             'timestamp' => REQUEST_TIME,
             'expiration' => REQUEST_TIME + $window,
           ))
           ->execute();
+      }
       /**
        * Makes the flood control mechanism forget an event for the current visitor.
+       *
        * @param $name
        *   The name of an event.
        * @param $identifier
        *   Optional identifier (defaults to the current user's IP address).
        */
       function flood_clear_event($name, $identifier = NULL) {
         if (!isset($identifier)) {
           $identifier = ip_address();
+        }
         db_delete('flood')
           ->condition('event', $name)
           ->condition('identifier', $identifier)
           ->execute();
+      }
       /**
        * Checks whether a user is allowed to proceed with the specified event.
+       *
        * Events can have thresholds saying that each user can only do that event
        * a certain number of times in a time window. This function verifies that the
        * current user has not exceeded this threshold.
+       *
        * @param $name
        *   The unique name of the event.
        * @param $threshold
        *   The maximum number of times each user can do this event per time window.
        * @param $window
        *   Number of seconds in the time window for this event (default is 3600
        *   seconds, or 1 hour).
        * @param $identifier
        *   Unique identifier of the current user. Defaults to their IP address.
+       *
        * @return
        *   TRUE if the user is allowed to proceed. FALSE if they have exceeded the
        *   threshold and should not be allowed to proceed.
        */
       function flood_is_allowed($name, $threshold, $window = 3600, $identifier = NULL) {
         if (!isset($identifier)) {
           $identifier = ip_address();
+        }
         $number = db_query("SELECT COUNT(*) FROM {flood} WHERE event = :event AND identifier = :identifier AND timestamp > :timestamp", array(
           ':event' => $name,
           ':identifier' => $identifier,
           ':timestamp' => REQUEST_TIME - $window))
           ->fetchField();
         return ($number < $threshold);
+      }
       /**
        * @defgroup sanitization Sanitization functions
        * @{
        * Functions to sanitize values.
+       *
        * See http://drupal.org/writing-secure-code for information
        * on writing secure code.
        */
       /**
        * Strips dangerous protocols (e.g. 'javascript:') from a URI.
+       *
        * This function must be called for all URIs within user-entered input prior
        * to being output to an HTML attribute value. It is often called as part of
        * check_url() or filter_xss(), but those functions return an HTML-encoded
        * string, so this function can be called independently when the output needs to
        * be a plain-text string for passing to t(), l(), drupal_attributes(), or
        * another function that will call check_plain() separately.
+       *
        * @param $uri
        *   A plain-text URI that might contain dangerous protocols.
+       *
        * @return
        *   A plain-text URI stripped of dangerous protocols. As with all plain-text
        *   strings, this return value must not be output to an HTML page without
        *   check_plain() being called on it. However, it can be passed to functions
        *   expecting plain-text strings.
+       *
        * @see check_url()
        */
       function drupal_strip_dangerous_protocols($uri) {
         static $allowed_protocols;
         if (!isset($allowed_protocols)) {
           $allowed_protocols = array_flip(variable_get('filter_allowed_protocols', array('ftp', 'http', 'https', 'irc', 'mailto', 'news', 'nntp', 'rtsp', 'sftp', 'ssh', 'tel', 'telnet', 'webcal')));
+        }
         // Iteratively remove any invalid protocol found.
         do {
           $before = $uri;
           $colonpos = strpos($uri, ':');
           if ($colonpos > 0) {
             // We found a colon, possibly a protocol. Verify.
             $protocol = substr($uri, 0, $colonpos);
             // If a colon is preceded by a slash, question mark or hash, it cannot
             // possibly be part of the URL scheme. This must be a relative URL, which
             // inherits the (safe) protocol of the base document.
             if (preg_match('![/?#]!', $protocol)) {
               break;
+            }
             // Check if this is a disallowed protocol. Per RFC2616, section 3.2.3
             // (URI Comparison) scheme comparison must be case-insensitive.
             if (!isset($allowed_protocols[strtolower($protocol)])) {
               $uri = substr($uri, $colonpos + 1);
+            }
+          }
         } while ($before != $uri);
         return $uri;
+      }
       /**
        * Strips dangerous protocols from a URI and encodes it for output to HTML.
+       *
        * @param $uri
        *   A plain-text URI that might contain dangerous protocols.
+       *
        * @return
        *   A URI stripped of dangerous protocols and encoded for output to an HTML
        *   attribute value. Because it is already encoded, it should not be set as a
        *   value within a $attributes array passed to drupal_attributes(), because
        *   drupal_attributes() expects those values to be plain-text strings. To pass
        *   a filtered URI to drupal_attributes(), call
        *   drupal_strip_dangerous_protocols() instead.
+       *
        * @see drupal_strip_dangerous_protocols()
        */
       function check_url($uri) {
         return check_plain(drupal_strip_dangerous_protocols($uri));
+      }
       /**
        * Applies a very permissive XSS/HTML filter for admin-only use.
+       *
        * Use only for fields where it is impractical to use the
        * whole filter system, but where some (mainly inline) mark-up
        * is desired (so check_plain() is not acceptable).
+       *
        * Allows all tags that can be used inside an HTML body, save
        * for scripts and styles.
        */
       function filter_xss_admin($string) {
         return filter_xss($string, array('a', 'abbr', 'acronym', 'address', 'article', 'aside', 'b', 'bdi', 'bdo', 'big', 'blockquote', 'br', 'caption', 'cite', 'code', 'col', 'colgroup', 'command', 'dd', 'del', 'details', 'dfn', 'div', 'dl', 'dt', 'em', 'figcaption', 'figure', 'footer', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'i', 'img', 'ins', 'kbd', 'li', 'mark', 'menu', 'meter', 'nav', 'ol', 'output', 'p', 'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'section', 'small', 'span', 'strong', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'time', 'tr', 'tt', 'u', 'ul', 'var', 'wbr'));
+      }
       /**
        * Filters HTML to prevent cross-site-scripting (XSS) vulnerabilities.
+       *
        * Based on kses by Ulf Harnhammar, see http://sourceforge.net/projects/kses.
        * For examples of various XSS attacks, see: http://ha.ckers.org/xss.html.
+       *
        * This code does four things:
        * - Removes characters and constructs that can trick browsers.
        * - Makes sure all HTML entities are well-formed.
        * - Makes sure all HTML tags and attributes are well-formed.
        * - Makes sure no HTML tags contain URLs with a disallowed protocol (e.g.
        *   javascript:).
+       *
        * @param $string
        *   The string with raw HTML in it. It will be stripped of everything that can
        *   cause an XSS attack.
        * @param $allowed_tags
        *   An array of allowed tags.
+       *
        * @return
        *   An XSS safe version of $string, or an empty string if $string is not
        *   valid UTF-8.
+       *
        * @see drupal_validate_utf8()
        */
       function filter_xss($string, $allowed_tags = array('a', 'em', 'strong', 'cite', 'blockquote', 'code', 'ul', 'ol', 'li', 'dl', 'dt', 'dd')) {
         // Only operate on valid UTF-8 strings. This is necessary to prevent cross
         // site scripting issues on Internet Explorer 6.
         if (!drupal_validate_utf8($string)) {
           return '';
+        }
         // Store the text format.
         _filter_xss_split($allowed_tags, TRUE);
         // Remove NULL characters (ignored by some browsers).
         $string = str_replace(chr(0), '', $string);
         // Remove Netscape 4 JS entities.
         $string = preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
         // Defuse all HTML entities.
         $string = str_replace('&', '&amp;', $string);
         // Change back only well-formed entities in our whitelist:
         // Decimal numeric entities.
         $string = preg_replace('/&amp;#([0-9]+;)/', '&#\1', $string);
         // Hexadecimal numeric entities.
         $string = preg_replace('/&amp;#[Xx]0*((?:[0-9A-Fa-f]{2})+;)/', '&#x\1', $string);
         // Named entities.
         $string = preg_replace('/&amp;([A-Za-z][A-Za-z0-9]*;)/', '&\1', $string);
         return preg_replace_callback('%
+          (
           <(?=[^a-zA-Z!/])  # a lone <
           |                 # or
           <!--.*?-->        # a comment
           |                 # or
           <[^>]*(>|$)       # a string that starts with a <, up until the > or the end of the string
           |                 # or
           >                 # just a >
           )%x', '_filter_xss_split', $string);
+      }
       /**
        * Processes an HTML tag.
+       *
        * @param $m
        *   An array with various meaning depending on the value of $store.
        *   If $store is TRUE then the array contains the allowed tags.
        *   If $store is FALSE then the array has one element, the HTML tag to process.
        * @param $store
        *   Whether to store $m.
+       *
        * @return
        *   If the element isn't allowed, an empty string. Otherwise, the cleaned up
        *   version of the HTML element.
        */
       function _filter_xss_split($m, $store = FALSE) {
         static $allowed_html;
         if ($store) {
           $allowed_html = array_flip($m);
           return;
+        }
         $string = $m[1];
         if (substr($string, 0, 1) != '<') {
           // We matched a lone ">" character.
           return '&gt;';
+        }
         elseif (strlen($string) == 1) {
           // We matched a lone "<" character.
           return '&lt;';
+        }
         if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9\-]+)([^>]*)>?|(<!--.*?-->)$%', $string, $matches)) {
           // Seriously malformed.
           return '';
+        }
         $slash = trim($matches[1]);
         $elem = &$matches[2];
         $attrlist = &$matches[3];
         $comment = &$matches[4];
         if ($comment) {
           $elem = '!--';
+        }
         if (!isset($allowed_html[strtolower($elem)])) {
           // Disallowed HTML element.
           return '';
+        }
         if ($comment) {
           return $comment;
+        }
         if ($slash != '') {
           return "</$elem>";
+        }
         // Is there a closing XHTML slash at the end of the attributes?
         $attrlist = preg_replace('%(\s?)/\s*$%', '\1', $attrlist, -1, $count);
         $xhtml_slash = $count ? ' /' : '';
         // Clean up attributes.
         $attr2 = implode(' ', _filter_xss_attributes($attrlist));
         $attr2 = preg_replace('/[<>]/', '', $attr2);
         $attr2 = strlen($attr2) ? ' ' . $attr2 : '';
         return "<$elem$attr2$xhtml_slash>";
+      }
       /**
        * Processes a string of HTML attributes.
+       *
        * @return
        *   Cleaned up version of the HTML attributes.
        */
       function _filter_xss_attributes($attr) {
         $attrarr = array();
         $mode = 0;
         $attrname = '';
         while (strlen($attr) != 0) {
           // Was the last operation successful?
           $working = 0;
           switch ($mode) {
             case 0:
               // Attribute name, href for instance.
               if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
                 $attrname = strtolower($match[1]);
                 $skip = ($attrname == 'style' || substr($attrname, 0, 2) == 'on');
                 $working = $mode = 1;
                 $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
+              }
               break;
             case 1:
               // Equals sign or valueless ("selected").
               if (preg_match('/^\s*=\s*/', $attr)) {
                 $working = 1; $mode = 2;
                 $attr = preg_replace('/^\s*=\s*/', '', $attr);
                 break;
+              }
               if (preg_match('/^\s+/', $attr)) {
                 $working = 1; $mode = 0;
                 if (!$skip) {
                   $attrarr[] = $attrname;
+                }
                 $attr = preg_replace('/^\s+/', '', $attr);
+              }
               break;
             case 2:
               // Attribute value, a URL after href= for instance.
               if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) {
                 $thisval = filter_xss_bad_protocol($match[1]);
                 if (!$skip) {
                   $attrarr[] = "$attrname=\"$thisval\"";
+                }
                 $working = 1;
                 $mode = 0;
                 $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
                 break;
+              }
               if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match)) {
                 $thisval = filter_xss_bad_protocol($match[1]);
                 if (!$skip) {
                   $attrarr[] = "$attrname='$thisval'";
+                }
                 $working = 1; $mode = 0;
                 $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
                 break;
+              }
               if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match)) {
                 $thisval = filter_xss_bad_protocol($match[1]);
                 if (!$skip) {
                   $attrarr[] = "$attrname=\"$thisval\"";
+                }
                 $working = 1; $mode = 0;
                 $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
+              }
               break;
+          }
           if ($working == 0) {
             // Not well formed; remove and try again.
             $attr = preg_replace('/
+              ^
+              (
               "[^"]*("|$)     # - a string that starts with a double quote, up until the next double quote or the end of the string
               |               # or
               \'[^\']*(\'|$)| # - a string that starts with a quote, up until the next quote or the end of the string
               |               # or
               \S              # - a non-whitespace character
               )*              # any number of the above three
               \s*             # any number of whitespaces
               /x', '', $attr);
             $mode = 0;
+          }
+        }
         // The attribute list ends with a valueless attribute like "selected".
         if ($mode == 1 && !$skip) {
           $attrarr[] = $attrname;
+        }
         return $attrarr;
+      }
       /**
        * Processes an HTML attribute value and strips dangerous protocols from URLs.
+       *
        * @param $string
        *   The string with the attribute value.
        * @param $decode
        *   (deprecated) Whether to decode entities in the $string. Set to FALSE if the
        *   $string is in plain text, TRUE otherwise. Defaults to TRUE. This parameter
        *   is deprecated and will be removed in Drupal 8. To process a plain-text URI,
        *   call drupal_strip_dangerous_protocols() or check_url() instead.
+       *
        * @return
        *   Cleaned up and HTML-escaped version of $string.
        */
       function filter_xss_bad_protocol($string, $decode = TRUE) {
         // Get the plain text representation of the attribute value (i.e. its meaning).
         // @todo Remove the $decode parameter in Drupal 8, and always assume an HTML
         //   string that needs decoding.
         if ($decode) {
           if (!function_exists('decode_entities')) {
             require_once DRUPAL_ROOT . '/includes/unicode.inc';
+          }
           $string = decode_entities($string);
+        }
         return check_plain(drupal_strip_dangerous_protocols($string));
+      }
       /**
        * @} End of "defgroup sanitization".
        */
       /**
        * @defgroup format Formatting
        * @{
        * Functions to format numbers, strings, dates, etc.
        */
       /**
        * Formats an RSS channel.
+       *
        * Arbitrary elements may be added using the $args associative array.
        */
       function format_rss_channel($title, $link, $description, $items, $langcode = NULL, $args = array()) {
         global $language_content;
         $langcode = $langcode ? $langcode : $language_content->language;
         $output = "<channel>\n";
         $output .= ' <title>' . check_plain($title) . "</title>\n";
         $output .= ' <link>' . check_url($link) . "</link>\n";
         // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
         // We strip all HTML tags, but need to prevent double encoding from properly
         // escaped source data (such as &amp becoming &amp;amp;).
         $output .= ' <description>' . check_plain(decode_entities(strip_tags($description))) . "</description>\n";
         $output .= ' <language>' . check_plain($langcode) . "</language>\n";
         $output .= format_xml_elements($args);
         $output .= $items;
         $output .= "</channel>\n";
         return $output;
+      }
       /**
        * Formats a single RSS item.
+       *
        * Arbitrary elements may be added using the $args associative array.
        */
       function format_rss_item($title, $link, $description, $args = array()) {
         $output = "<item>\n";
         $output .= ' <title>' . check_plain($title) . "</title>\n";
         $output .= ' <link>' . check_url($link) . "</link>\n";
         $output .= ' <description>' . check_plain($description) . "</description>\n";
         $output .= format_xml_elements($args);
         $output .= "</item>\n";
         return $output;
+      }
       /**
        * Formats XML elements.
+       *
        * @param $array
        *   An array where each item represents an element and is either a:
        *   - (key => value) pair (<key>value</key>)
        *   - Associative array with fields:
        *     - 'key': element name
        *     - 'value': element contents
        *     - 'attributes': associative array of element attributes
        *     - 'encoded': TRUE if 'value' is already encoded
+       *
        * In both cases, 'value' can be a simple string, or it can be another array
        * with the same format as $array itself for nesting.
+       *
        * If 'encoded' is TRUE it is up to the caller to ensure that 'value' is either
        * entity-encoded or CDATA-escaped. Using this option is not recommended when
        * working with untrusted user input, since failing to escape the data
        * correctly has security implications.
        */
       function format_xml_elements($array) {
         $output = '';
         foreach ($array as $key => $value) {
           if (is_numeric($key)) {
             if ($value['key']) {
               $output .= ' <' . $value['key'];
               if (isset($value['attributes']) && is_array($value['attributes'])) {
                 $output .= drupal_attributes($value['attributes']);
+              }
               if (isset($value['value']) && $value['value'] != '') {
                 $output .= '>' . (is_array($value['value']) ? format_xml_elements($value['value']) : (!empty($value['encoded']) ? $value['value'] : check_plain($value['value']))) . '</' . $value['key'] . ">\n";
+              }
               else {
                 $output .= " />\n";
+              }
+            }
+          }
           else {
             $output .= ' <' . $key . '>' . (is_array($value) ? format_xml_elements($value) : check_plain($value)) . "</$key>\n";
+          }
+        }
         return $output;
+      }
       /**
        * Formats a string containing a count of items.
+       *
        * This function ensures that the string is pluralized correctly. Since t() is
        * called by this function, make sure not to pass already-localized strings to
        * it.
+       *
        * For example:
        * @code
        *   $output = format_plural($node->comment_count, '1 comment', '@count comments');
        * @endcode
+       *
        * Example with additional replacements:
        * @code
        *   $output = format_plural($update_count,
        *     'Changed the content type of 1 post from %old-type to %new-type.',
        *     'Changed the content type of @count posts from %old-type to %new-type.',
        *     array('%old-type' => $info->old_type, '%new-type' => $info->new_type));
        * @endcode
+       *
        * @param $count
        *   The item count to display.
        * @param $singular
        *   The string for the singular case. Make sure it is clear this is singular,
        *   to ease translation (e.g. use "1 new comment" instead of "1 new"). Do not
        *   use @count in the singular string.
        * @param $plural
        *   The string for the plural case. Make sure it is clear this is plural, to
        *   ease translation. Use @count in place of the item count, as in
        *   "@count new comments".
        * @param $args
        *   An associative array of replacements to make after translation. Instances
        *   of any key in this array are replaced with the corresponding value.
        *   Based on the first character of the key, the value is escaped and/or
        *   themed. See format_string(). Note that you do not need to include @count
        *   in this array; this replacement is done automatically for the plural case.
        * @param $options
        *   An associative array of additional options. See t() for allowed keys.
+       *
        * @return
        *   A translated string.
+       *
        * @see t()
        * @see format_string()
        */
       function format_plural($count, $singular, $plural, array $args = array(), array $options = array()) {
         $args['@count'] = $count;
         if ($count == 1) {
           return t($singular, $args, $options);
+        }
         // Get the plural index through the gettext formula.
         $index = (function_exists('locale_get_plural')) ? locale_get_plural($count, isset($options['langcode']) ? $options['langcode'] : NULL) : -1;
         // If the index cannot be computed, use the plural as a fallback (which
         // allows for most flexiblity with the replaceable @count value).
         if ($index < 0) {
           return t($plural, $args, $options);
+        }
         else {
           switch ($index) {
             case "0":
               return t($singular, $args, $options);
             case "1":
               return t($plural, $args, $options);
             default:
               unset($args['@count']);
               $args['@count[' . $index . ']'] = $count;
               return t(strtr($plural, array('@count' => '@count[' . $index . ']')), $args, $options);
+          }
+        }
+      }
       /**
        * Parses a given byte count.
+       *
        * @param $size
        *   A size expressed as a number of bytes with optional SI or IEC binary unit
        *   prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
+       *
        * @return
        *   An integer representation of the size in bytes.
        */
       function parse_size($size) {
         $unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
         $size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
         if ($unit) {
           // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
           return round($size * pow(DRUPAL_KILOBYTE, stripos('bkmgtpezy', $unit[0])));
+        }
         else {
           return round($size);
+        }
+      }
       /**
        * Generates a string representation for the given byte count.
+       *
        * @param $size
        *   A size in bytes.
        * @param $langcode
        *   Optional language code to translate to a language other than what is used
        *   to display the page.
+       *
        * @return
        *   A translated string representation of the size.
        */
       function format_size($size, $langcode = NULL) {
         if ($size < DRUPAL_KILOBYTE) {
           return format_plural($size, '1 byte', '@count bytes', array(), array('langcode' => $langcode));
+        }
         else {
           $size = $size / DRUPAL_KILOBYTE; // Convert bytes to kilobytes.
           $units = array(
             t('@size KB', array(), array('langcode' => $langcode)),
             t('@size MB', array(), array('langcode' => $langcode)),
             t('@size GB', array(), array('langcode' => $langcode)),
             t('@size TB', array(), array('langcode' => $langcode)),
             t('@size PB', array(), array('langcode' => $langcode)),
             t('@size EB', array(), array('langcode' => $langcode)),
             t('@size ZB', array(), array('langcode' => $langcode)),
             t('@size YB', array(), array('langcode' => $langcode)),
           );
           foreach ($units as $unit) {
             if (round($size, 2) >= DRUPAL_KILOBYTE) {
               $size = $size / DRUPAL_KILOBYTE;
+            }
             else {
               break;
+            }
+          }
           return str_replace('@size', round($size, 2), $unit);
+        }
+      }
       /**
        * Formats a time interval with the requested granularity.
+       *
        * @param $interval
        *   The length of the interval in seconds.
        * @param $granularity
        *   How many different units to display in the string.
        * @param $langcode
        *   Optional language code to translate to a language other than
        *   what is used to display the page.
+       *
        * @return
        *   A translated string representation of the interval.
        */
       function format_interval($interval, $granularity = 2, $langcode = NULL) {
         $units = array(
           '1 year|@count years' => 31536000,
           '1 month|@count months' => 2592000,
           '1 week|@count weeks' => 604800,
           '1 day|@count days' => 86400,
           '1 hour|@count hours' => 3600,
           '1 min|@count min' => 60,
           '1 sec|@count sec' => 1
         );
         $output = '';
         foreach ($units as $key => $value) {
           $key = explode('|', $key);
           if ($interval >= $value) {
             $output .= ($output ? ' ' : '') . format_plural(floor($interval / $value), $key[0], $key[1], array(), array('langcode' => $langcode));
             $interval %= $value;
             $granularity--;
+          }
           if ($granularity == 0) {
             break;
+          }
+        }
         return $output ? $output : t('0 sec', array(), array('langcode' => $langcode));
+      }
       /**
        * Formats a date, using a date type or a custom date format string.
+       *
        * @param $timestamp
        *   A UNIX timestamp to format.
        * @param $type
        *   (optional) The format to use, one of:
        *   - 'short', 'medium', or 'long' (the corresponding built-in date formats).
        *   - The name of a date type defined by a module in hook_date_format_types(),
        *     if it's been assigned a format.
        *   - The machine name of an administrator-defined date format.
        *   - 'custom', to use $format.
        *   Defaults to 'medium'.
        * @param $format
        *   (optional) If $type is 'custom', a PHP date format string suitable for
        *   input to date(). Use a backslash to escape ordinary text, so it does not
        *   get interpreted as date format characters.
        * @param $timezone
        *   (optional) Time zone identifier, as described at
        *   http://php.net/manual/timezones.php Defaults to the time zone used to
        *   display the page.
        * @param $langcode
        *   (optional) Language code to translate to. Defaults to the language used to
        *   display the page.
+       *
        * @return
        *   A translated date string in the requested format.
        */
       function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL, $langcode = NULL) {
         // Use the advanced drupal_static() pattern, since this is called very often.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast)) {
           $drupal_static_fast['timezones'] = &drupal_static(__FUNCTION__);
+        }
         $timezones = &$drupal_static_fast['timezones'];
         if (!isset($timezone)) {
           $timezone = date_default_timezone_get();
+        }
         // Store DateTimeZone objects in an array rather than repeatedly
         // constructing identical objects over the life of a request.
         if (!isset($timezones[$timezone])) {
           $timezones[$timezone] = timezone_open($timezone);
+        }
         // Use the default langcode if none is set.
         global $language;
         if (empty($langcode)) {
           $langcode = isset($language->language) ? $language->language : 'en';
+        }
         switch ($type) {
           case 'short':
             $format = variable_get('date_format_short', 'm/d/Y - H:i');
             break;
           case 'long':
             $format = variable_get('date_format_long', 'l, F j, Y - H:i');
             break;
           case 'custom':
             // No change to format.
             break;
           case 'medium':
           default:
             // Retrieve the format of the custom $type passed.
             if ($type != 'medium') {
               $format = variable_get('date_format_' . $type, '');
+            }
             // Fall back to 'medium'.
             if ($format === '') {
               $format = variable_get('date_format_medium', 'D, m/d/Y - H:i');
+            }
             break;
+        }
         // Create a DateTime object from the timestamp.
         $date_time = date_create('@' . $timestamp);
         // Set the time zone for the DateTime object.
         date_timezone_set($date_time, $timezones[$timezone]);
         // Encode markers that should be translated. 'A' becomes '\xEF\AA\xFF'.
         // xEF and xFF are invalid UTF-8 sequences, and we assume they are not in the
         // input string.
         // Paired backslashes are isolated to prevent errors in read-ahead evaluation.
         // The read-ahead expression ensures that A matches, but not \A.
         $format = preg_replace(array('/\\\\\\\\/', '/(?<!\\\\)([AaeDlMTF])/'), array("\xEF\\\\\\\\\xFF", "\xEF\\\\\$1\$1\xFF"), $format);
         // Call date_format().
         $format = date_format($date_time, $format);
         // Pass the langcode to _format_date_callback().
         _format_date_callback(NULL, $langcode);
         // Translate the marked sequences.
         return preg_replace_callback('/\xEF([AaeDlMTF]?)(.*?)\xFF/', '_format_date_callback', $format);
+      }
       /**
        * Returns an ISO8601 formatted date based on the given date.
+       *
        * Callback for use within hook_rdf_mapping() implementations.
+       *
        * @param $date
        *   A UNIX timestamp.
+       *
        * @return string
        *   An ISO8601 formatted date.
        */
       function date_iso8601($date) {
         // The DATE_ISO8601 constant cannot be used here because it does not match
         // date('c') and produces invalid RDF markup.
         return date('c', $date);
+      }
       /**
        * Translates a formatted date string.
+       *
        * Callback for preg_replace_callback() within format_date().
        */
       function _format_date_callback(array $matches = NULL, $new_langcode = NULL) {
         // We cache translations to avoid redundant and rather costly calls to t().
         static $cache, $langcode;
         if (!isset($matches)) {
           $langcode = $new_langcode;
           return;
+        }
         $code = $matches[1];
         $string = $matches[2];
         if (!isset($cache[$langcode][$code][$string])) {
           $options = array(
             'langcode' => $langcode,
           );
           if ($code == 'F') {
             $options['context'] = 'Long month name';
+          }
           if ($code == '') {
             $cache[$langcode][$code][$string] = $string;
+          }
           else {
             $cache[$langcode][$code][$string] = t($string, array(), $options);
+          }
+        }
         return $cache[$langcode][$code][$string];
+      }
       /**
        * Format a username.
+       *
        * This is also the label callback implementation of
        * callback_entity_info_label() for user_entity_info().
+       *
        * By default, the passed-in object's 'name' property is used if it exists, or
        * else, the site-defined value for the 'anonymous' variable. However, a module
        * may override this by implementing hook_username_alter(&$name, $account).
+       *
        * @see hook_username_alter()
+       *
        * @param $account
        *   The account object for the user whose name is to be formatted.
+       *
        * @return
        *   An unsanitized string with the username to display. The code receiving
        *   this result must ensure that check_plain() is called on it before it is
        *   printed to the page.
        */
       function format_username($account) {
         $name = !empty($account->name) ? $account->name : variable_get('anonymous', t('Anonymous'));
         drupal_alter('username', $name, $account);
         return $name;
+      }
       /**
        * @} End of "defgroup format".
        */
       /**
        * Generates an internal or external URL.
+       *
        * When creating links in modules, consider whether l() could be a better
        * alternative than url().
+       *
        * @param $path
        *   (optional) The internal path or external URL being linked to, such as
        *   "node/34" or "http://example.com/foo". The default value is equivalent to
        *   passing in '<front>'. A few notes:
        *   - If you provide a full URL, it will be considered an external URL.
        *   - If you provide only the path (e.g. "node/34"), it will be
        *     considered an internal link. In this case, it should be a system URL,
        *     and it will be replaced with the alias, if one exists. Additional query
        *     arguments for internal paths must be supplied in $options['query'], not
        *     included in $path.
        *   - If you provide an internal path and $options['alias'] is set to TRUE, the
        *     path is assumed already to be the correct path alias, and the alias is
        *     not looked up.
        *   - The special string '<front>' generates a link to the site's base URL.
        *   - If your external URL contains a query (e.g. http://example.com/foo?a=b),
        *     then you can either URL encode the query keys and values yourself and
        *     include them in $path, or use $options['query'] to let this function
        *     URL encode them.
        * @param $options
        *   (optional) An associative array of additional options, with the following
        *   elements:
        *   - 'query': An array of query key/value-pairs (without any URL-encoding) to
        *     append to the URL.
        *   - 'fragment': A fragment identifier (named anchor) to append to the URL.
        *     Do not include the leading '#' character.
        *   - 'absolute': Defaults to FALSE. Whether to force the output to be an
        *     absolute link (beginning with http:). Useful for links that will be
        *     displayed outside the site, such as in an RSS feed.
        *   - 'alias': Defaults to FALSE. Whether the given path is a URL alias
        *     already.
        *   - 'external': Whether the given path is an external URL.
        *   - 'language': An optional language object. If the path being linked to is
        *     internal to the site, $options['language'] is used to look up the alias
        *     for the URL. If $options['language'] is omitted, the global $language_url
        *     will be used.
        *   - 'https': Whether this URL should point to a secure location. If not
        *     defined, the current scheme is used, so the user stays on HTTP or HTTPS
        *     respectively. TRUE enforces HTTPS and FALSE enforces HTTP, but HTTPS can
        *     only be enforced when the variable 'https' is set to TRUE.
        *   - 'base_url': Only used internally, to modify the base URL when a language
        *     dependent URL requires so.
        *   - 'prefix': Only used internally, to modify the path when a language
        *     dependent URL requires so.
        *   - 'script': The script filename in Drupal's root directory to use when
        *     clean URLs are disabled, such as 'index.php'. Defaults to an empty
        *     string, as most modern web servers automatically find 'index.php'. If
        *     clean URLs are disabled, the value of $path is appended as query
        *     parameter 'q' to $options['script'] in the returned URL. When deploying
        *     Drupal on a web server that cannot be configured to automatically find
        *     index.php, then hook_url_outbound_alter() can be implemented to force
        *     this value to 'index.php'.
        *   - 'entity_type': The entity type of the object that called url(). Only
        *     set if url() is invoked by entity_uri().
        *   - 'entity': The entity object (such as a node) for which the URL is being
        *     generated. Only set if url() is invoked by entity_uri().
+       *
        * @return
        *   A string containing a URL to the given path.
        */
       function url($path = NULL, array $options = array()) {
         // Merge in defaults.
         $options += array(
           'fragment' => '',
           'query' => array(),
           'absolute' => FALSE,
           'alias' => FALSE,
           'prefix' => ''
         );
         if (!isset($options['external'])) {
           $options['external'] = url_is_external($path);
+        }
         // Preserve the original path before altering or aliasing.
         $original_path = $path;
         // Allow other modules to alter the outbound URL and options.
         drupal_alter('url_outbound', $path, $options, $original_path);
         if (isset($options['fragment']) && $options['fragment'] !== '') {
           $options['fragment'] = '#' . $options['fragment'];
+        }
         if ($options['external']) {
           // Split off the fragment.
           if (strpos($path, '#') !== FALSE) {
             list($path, $old_fragment) = explode('#', $path, 2);
             // If $options contains no fragment, take it over from the path.
             if (isset($old_fragment) && !$options['fragment']) {
               $options['fragment'] = '#' . $old_fragment;
+            }
+          }
           // Append the query.
           if ($options['query']) {
             $path .= (strpos($path, '?') !== FALSE ? '&' : '?') . drupal_http_build_query($options['query']);
+          }
           if (isset($options['https']) && variable_get('https', FALSE)) {
             if ($options['https'] === TRUE) {
               $path = str_replace('http://', 'https://', $path);
+            }
             elseif ($options['https'] === FALSE) {
               $path = str_replace('https://', 'http://', $path);
+            }
+          }
           // Reassemble.
           return $path . $options['fragment'];
+        }
         // Strip leading slashes from internal paths to prevent them becoming external
         // URLs without protocol. /example.com should not be turned into
         // //example.com.
         $path = ltrim($path, '/');
         global $base_url, $base_secure_url, $base_insecure_url;
         // The base_url might be rewritten from the language rewrite in domain mode.
         if (!isset($options['base_url'])) {
           if (isset($options['https']) && variable_get('https', FALSE)) {
             if ($options['https'] === TRUE) {
               $options['base_url'] = $base_secure_url;
               $options['absolute'] = TRUE;
+            }
             elseif ($options['https'] === FALSE) {
               $options['base_url'] = $base_insecure_url;
               $options['absolute'] = TRUE;
+            }
+          }
           else {
             $options['base_url'] = $base_url;
+          }
+        }
         // The special path '<front>' links to the default front page.
         if ($path == '<front>') {
           $path = '';
+        }
         elseif (!empty($path) && !$options['alias']) {
           $language = isset($options['language']) && isset($options['language']->language) ? $options['language']->language : '';
           $alias = drupal_get_path_alias($original_path, $language);
           if ($alias != $original_path) {
             $path = $alias;
+          }
+        }
         $base = $options['absolute'] ? $options['base_url'] . '/' : base_path();
         $prefix = empty($path) ? rtrim($options['prefix'], '/') : $options['prefix'];
         // With Clean URLs.
         if (!empty($GLOBALS['conf']['clean_url'])) {
           $path = drupal_encode_path($prefix . $path);
           if ($options['query']) {
             return $base . $path . '?' . drupal_http_build_query($options['query']) . $options['fragment'];
+          }
           else {
             return $base . $path . $options['fragment'];
+          }
+        }
         // Without Clean URLs.
         else {
           $path = $prefix . $path;
           $query = array();
           if (!empty($path)) {
             $query['q'] = $path;
+          }
           if ($options['query']) {
             // We do not use array_merge() here to prevent overriding $path via query
             // parameters.
             $query += $options['query'];
+          }
           $query = $query ? ('?' . drupal_http_build_query($query)) : '';
           $script = isset($options['script']) ? $options['script'] : '';
           return $base . $script . $query . $options['fragment'];
+        }
+      }
       /**
        * Returns TRUE if a path is external to Drupal (e.g. http://example.com).
+       *
        * If a path cannot be assessed by Drupal's menu handler, then we must
        * treat it as potentially insecure.
+       *
        * @param $path
        *   The internal path or external URL being linked to, such as "node/34" or
        *   "http://example.com/foo".
+       *
        * @return
        *   Boolean TRUE or FALSE, where TRUE indicates an external path.
        */
       function url_is_external($path) {
         $colonpos = strpos($path, ':');
         // Some browsers treat \ as / so normalize to forward slashes.
         $path = str_replace('\\', '/', $path);
         // If the path starts with 2 slashes then it is always considered an external
         // URL without an explicit protocol part.
         return (strpos($path, '//') === 0)
           // Leading control characters may be ignored or mishandled by browsers, so
           // assume such a path may lead to an external location. The \p{C} character
           // class matches all UTF-8 control, unassigned, and private characters.
           || (preg_match('/^\p{C}/u', $path) !== 0)
           // Avoid calling drupal_strip_dangerous_protocols() if there is any slash
           // (/), hash (#) or question_mark (?) before the colon (:) occurrence - if
           // any - as this would clearly mean it is not a URL.
           || ($colonpos !== FALSE
             && !preg_match('![/?#]!', substr($path, 0, $colonpos))
             && drupal_strip_dangerous_protocols($path) == $path);
+      }
       /**
        * Formats an attribute string for an HTTP header.
+       *
        * @param $attributes
        *   An associative array of attributes such as 'rel'.
+       *
        * @return
        *   A ; separated string ready for insertion in a HTTP header. No escaping is
        *   performed for HTML entities, so this string is not safe to be printed.
+       *
        * @see drupal_add_http_header()
        */
       function drupal_http_header_attributes(array $attributes = array()) {
         foreach ($attributes as $attribute => &$data) {
           if (is_array($data)) {
             $data = implode(' ', $data);
+          }
           $data = $attribute . '="' . $data . '"';
+        }
         return $attributes ? ' ' . implode('; ', $attributes) : '';
+      }
       /**
        * Converts an associative array to an XML/HTML tag attribute string.
+       *
        * Each array key and its value will be formatted into an attribute string.
        * If a value is itself an array, then its elements are concatenated to a single
        * space-delimited string (for example, a class attribute with multiple values).
+       *
        * Attribute values are sanitized by running them through check_plain().
        * Attribute names are not automatically sanitized. When using user-supplied
        * attribute names, it is strongly recommended to allow only white-listed names,
        * since certain attributes carry security risks and can be abused.
+       *
        * Examples of security aspects when using drupal_attributes:
        * @code
        *   // By running the value in the following statement through check_plain,
        *   // the malicious script is neutralized.
        *   drupal_attributes(array('title' => t('<script>steal_cookie();</script>')));
+       *
        *   // The statement below demonstrates dangerous use of drupal_attributes, and
        *   // will return an onmouseout attribute with JavaScript code that, when used
        *   // as attribute in a tag, will cause users to be redirected to another site.
        *   //
        *   // In this case, the 'onmouseout' attribute should not be whitelisted --
        *   // you don't want users to have the ability to add this attribute or others
        *   // that take JavaScript commands.
        *   drupal_attributes(array('onmouseout' => 'window.location="http://malicious.com/";')));
        * @endcode
+       *
        * @param $attributes
        *   An associative array of key-value pairs to be converted to attributes.
+       *
        * @return
        *   A string ready for insertion in a tag (starts with a space).
+       *
        * @ingroup sanitization
        */
       function drupal_attributes(array $attributes = array()) {
         foreach ($attributes as $attribute => &$data) {
           $data = implode(' ', (array) $data);
           $data = $attribute . '="' . check_plain($data) . '"';
+        }
         return $attributes ? ' ' . implode(' ', $attributes) : '';
+      }
       /**
        * Formats an internal or external URL link as an HTML anchor tag.
+       *
        * This function correctly handles aliased paths and adds an 'active' class
        * attribute to links that point to the current page (for theming), so all
        * internal links output by modules should be generated by this function if
        * possible.
+       *
        * However, for links enclosed in translatable text you should use t() and
        * embed the HTML anchor tag directly in the translated string. For example:
        * @code
        * t('Visit the <a href="@url">settings</a> page', array('@url' => url('admin')));
        * @endcode
        * This keeps the context of the link title ('settings' in the example) for
        * translators.
+       *
        * @param string $text
        *   The translated link text for the anchor tag.
        * @param string $path
        *   The internal path or external URL being linked to, such as "node/34" or
        *   "http://example.com/foo". After the url() function is called to construct
        *   the URL from $path and $options, the resulting URL is passed through
        *   check_plain() before it is inserted into the HTML anchor tag, to ensure
        *   well-formed HTML. See url() for more information and notes.
        * @param array $options
        *   An associative array of additional options. Defaults to an empty array. It
        *   may contain the following elements.
        *   - 'attributes': An associative array of HTML attributes to apply to the
        *     anchor tag. If element 'class' is included, it must be an array; 'title'
        *     must be a string; other elements are more flexible, as they just need
        *     to work in a call to drupal_attributes($options['attributes']).
        *   - 'html' (default FALSE): Whether $text is HTML or just plain-text. For
        *     example, to make an image tag into a link, this must be set to TRUE, or
        *     you will see the escaped HTML image tag. $text is not sanitized if
        *     'html' is TRUE. The calling function must ensure that $text is already
        *     safe.
        *   - 'language': An optional language object. If the path being linked to is
        *     internal to the site, $options['language'] is used to determine whether
        *     the link is "active", or pointing to the current page (the language as
        *     well as the path must match). This element is also used by url().
        *   - Additional $options elements used by the url() function.
+       *
        * @return string
        *   An HTML string containing a link to the given path.
+       *
        * @see url()
        */
       function l($text, $path, array $options = array()) {
         global $language_url;
         static $use_theme = NULL;
         // Merge in defaults.
         $options += array(
           'attributes' => array(),
           'html' => FALSE,
         );
         // Append active class.
         if (($path == $_GET['q'] || ($path == '<front>' && drupal_is_front_page())) &&
             (empty($options['language']) || $options['language']->language == $language_url->language)) {
           $options['attributes']['class'][] = 'active';
+        }
         // Remove all HTML and PHP tags from a tooltip. For best performance, we act only
         // if a quick strpos() pre-check gave a suspicion (because strip_tags() is expensive).
         if (isset($options['attributes']['title']) && strpos($options['attributes']['title'], '<') !== FALSE) {
           $options['attributes']['title'] = strip_tags($options['attributes']['title']);
+        }
         // Determine if rendering of the link is to be done with a theme function
         // or the inline default. Inline is faster, but if the theme system has been
         // loaded and a module or theme implements a preprocess or process function
         // or overrides the theme_link() function, then invoke theme(). Preliminary
         // benchmarks indicate that invoking theme() can slow down the l() function
         // by 20% or more, and that some of the link-heavy Drupal pages spend more
         // than 10% of the total page request time in the l() function.
         if (!isset($use_theme) && function_exists('theme')) {
           // Allow edge cases to prevent theme initialization and force inline link
           // rendering.
           if (variable_get('theme_link', TRUE)) {
             drupal_theme_initialize();
             $registry = theme_get_registry(FALSE);
             // We don't want to duplicate functionality that's in theme(), so any
             // hint of a module or theme doing anything at all special with the 'link'
             // theme hook should simply result in theme() being called. This includes
             // the overriding of theme_link() with an alternate function or template,
             // the presence of preprocess or process functions, or the presence of
             // include files.
             $use_theme = !isset($registry['link']['function']) || ($registry['link']['function'] != 'theme_link');
             $use_theme = $use_theme || !empty($registry['link']['preprocess functions']) || !empty($registry['link']['process functions']) || !empty($registry['link']['includes']);
+          }
           else {
             $use_theme = FALSE;
+          }
+        }
         if ($use_theme) {
           return theme('link', array('text' => $text, 'path' => $path, 'options' => $options));
+        }
         // The result of url() is a plain-text URL. Because we are using it here
         // in an HTML argument context, we need to encode it properly.
         return '<a href="' . check_plain(url($path, $options)) . '"' . drupal_attributes($options['attributes']) . '>' . ($options['html'] ? $text : check_plain($text)) . '</a>';
+      }
       /**
        * Delivers a page callback result to the browser in the appropriate format.
+       *
        * This function is most commonly called by menu_execute_active_handler(), but
        * can also be called by error conditions such as drupal_not_found(),
        * drupal_access_denied(), and drupal_site_offline().
+       *
        * When a user requests a page, index.php calls menu_execute_active_handler(),
        * which calls the 'page callback' function registered in hook_menu(). The page
        * callback function can return one of:
        * - NULL: to indicate no content.
        * - An integer menu status constant: to indicate an error condition.
        * - A string of HTML content.
        * - A renderable array of content.
        * Returning a renderable array rather than a string of HTML is preferred,
        * because that provides modules with more flexibility in customizing the final
        * result.
+       *
        * When the page callback returns its constructed content to
        * menu_execute_active_handler(), this function gets called. The purpose of
        * this function is to determine the most appropriate 'delivery callback'
        * function to route the content to. The delivery callback function then
        * sends the content to the browser in the needed format. The default delivery
        * callback is drupal_deliver_html_page(), which delivers the content as an HTML
        * page, complete with blocks in addition to the content. This default can be
        * overridden on a per menu router item basis by setting 'delivery callback' in
        * hook_menu() or hook_menu_alter(), and can also be overridden on a per request
        * basis in hook_page_delivery_callback_alter().
+       *
        * For example, the same page callback function can be used for an HTML
        * version of the page and an Ajax version of the page. The page callback
        * function just needs to decide what content is to be returned and the
        * delivery callback function will send it as an HTML page or an Ajax
        * response, as appropriate.
+       *
        * In order for page callbacks to be reusable in different delivery formats,
        * they should not issue any "print" or "echo" statements, but instead just
        * return content.
+       *
        * Also note that this function does not perform access checks. The delivery
        * callback function specified in hook_menu(), hook_menu_alter(), or
        * hook_page_delivery_callback_alter() will be called even if the router item
        * access checks fail. This is intentional (it is needed for JSON and other
        * purposes), but it has security implications. Do not call this function
        * directly unless you understand the security implications, and be careful in
        * writing delivery callbacks, so that they do not violate security. See
        * drupal_deliver_html_page() for an example of a delivery callback that
        * respects security.
+       *
        * @param $page_callback_result
        *   The result of a page callback. Can be one of:
        *   - NULL: to indicate no content.
        *   - An integer menu status constant: to indicate an error condition.
        *   - A string of HTML content.
        *   - A renderable array of content.
        * @param $default_delivery_callback
        *   (Optional) If given, it is the name of a delivery function most likely
        *   to be appropriate for the page request as determined by the calling
        *   function (e.g., menu_execute_active_handler()). If not given, it is
        *   determined from the menu router information of the current page.
+       *
        * @see menu_execute_active_handler()
        * @see hook_menu()
        * @see hook_menu_alter()
        * @see hook_page_delivery_callback_alter()
        */
       function drupal_deliver_page($page_callback_result, $default_delivery_callback = NULL) {
         if (!isset($default_delivery_callback) && ($router_item = menu_get_item())) {
           $default_delivery_callback = $router_item['delivery_callback'];
+        }
         $delivery_callback = !empty($default_delivery_callback) ? $default_delivery_callback : 'drupal_deliver_html_page';
         // Give modules a chance to alter the delivery callback used, based on
         // request-time context (e.g., HTTP request headers).
         drupal_alter('page_delivery_callback', $delivery_callback);
         if (function_exists($delivery_callback)) {
           $delivery_callback($page_callback_result);
+        }
         else {
           // If a delivery callback is specified, but doesn't exist as a function,
           // something is wrong, but don't print anything, since it's not known
           // what format the response needs to be in.
           watchdog('delivery callback not found', 'callback %callback not found: %q.', array('%callback' => $delivery_callback, '%q' => $_GET['q']), WATCHDOG_ERROR);
+        }
+      }
       /**
        * Packages and sends the result of a page callback to the browser as HTML.
+       *
        * @param $page_callback_result
        *   The result of a page callback. Can be one of:
        *   - NULL: to indicate no content.
        *   - An integer menu status constant: to indicate an error condition.
        *   - A string of HTML content.
        *   - A renderable array of content.
+       *
        * @see drupal_deliver_page()
        */
       function drupal_deliver_html_page($page_callback_result) {
         // Emit the correct charset HTTP header, but not if the page callback
         // result is NULL, since that likely indicates that it printed something
         // in which case, no further headers may be sent, and not if code running
         // for this page request has already set the content type header.
         if (isset($page_callback_result) && is_null(drupal_get_http_header('Content-Type'))) {
           drupal_add_http_header('Content-Type', 'text/html; charset=utf-8');
+        }
         // Send appropriate HTTP-Header for browsers and search engines.
         global $language;
         drupal_add_http_header('Content-Language', $language->language);
         // By default, do not allow the site to be rendered in an iframe on another
         // domain, but provide a variable to override this. If the code running for
         // this page request already set the X-Frame-Options header earlier, don't
         // overwrite it here.
         $frame_options = variable_get('x_frame_options', 'SAMEORIGIN');
         if ($frame_options && is_null(drupal_get_http_header('X-Frame-Options'))) {
           drupal_add_http_header('X-Frame-Options', $frame_options);
+        }
         // Menu status constants are integers; page content is a string or array.
         if (is_int($page_callback_result)) {
           // @todo: Break these up into separate functions?
           switch ($page_callback_result) {
             case MENU_NOT_FOUND:
               // Print a 404 page.
               drupal_add_http_header('Status', '404 Not Found');
               watchdog('page not found', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);
               // Check for and return a fast 404 page if configured.
               drupal_fast_404();
               // Keep old path for reference, and to allow forms to redirect to it.
               if (!isset($_GET['destination'])) {
                 // Make sure that the current path is not interpreted as external URL.
                 if (!url_is_external($_GET['q'])) {
                   $_GET['destination'] = $_GET['q'];
+                }
+              }
               $path = drupal_get_normal_path(variable_get('site_404', ''));
               if ($path && $path != $_GET['q']) {
                 // Custom 404 handler. Set the active item in case there are tabs to
                 // display, or other dependencies on the path.
                 menu_set_active_item($path);
                 $return = menu_execute_active_handler($path, FALSE);
+              }
               if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
                 // Standard 404 handler.
                 drupal_set_title(t('Page not found'));
                 $return = t('The requested page "@path" could not be found.', array('@path' => request_uri()));
+              }
               drupal_set_page_content($return);
               $page = element_info('page');
               print drupal_render_page($page);
               break;
             case MENU_ACCESS_DENIED:
               // Print a 403 page.
               drupal_add_http_header('Status', '403 Forbidden');
               watchdog('access denied', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);
               // Keep old path for reference, and to allow forms to redirect to it.
               if (!isset($_GET['destination'])) {
                 // Make sure that the current path is not interpreted as external URL.
                 if (!url_is_external($_GET['q'])) {
                   $_GET['destination'] = $_GET['q'];
+                }
+              }
               $path = drupal_get_normal_path(variable_get('site_403', ''));
               if ($path && $path != $_GET['q']) {
                 // Custom 403 handler. Set the active item in case there are tabs to
                 // display or other dependencies on the path.
                 menu_set_active_item($path);
                 $return = menu_execute_active_handler($path, FALSE);
+              }
               if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
                 // Standard 403 handler.
                 drupal_set_title(t('Access denied'));
                 $return = t('You are not authorized to access this page.');
+              }
               print drupal_render_page($return);
               break;
             case MENU_SITE_OFFLINE:
               // Print a 503 page.
               drupal_maintenance_theme();
               drupal_add_http_header('Status', '503 Service unavailable');
               drupal_set_title(t('Site under maintenance'));
               print theme('maintenance_page', array('content' => filter_xss_admin(variable_get('maintenance_mode_message',
                 t('@site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('@site' => variable_get('site_name', 'Drupal')))))));
               break;
+          }
+        }
         elseif (isset($page_callback_result)) {
           // Print anything besides a menu constant, assuming it's not NULL or
           // undefined.
           print drupal_render_page($page_callback_result);
+        }
         // Perform end-of-request tasks.
         drupal_page_footer();
+      }
       /**
        * Performs end-of-request tasks.
+       *
        * This function sets the page cache if appropriate, and allows modules to
        * react to the closing of the page by calling hook_exit().
        */
       function drupal_page_footer() {
         global $user;
         module_invoke_all('exit');
         // Commit the user session, if needed.
         drupal_session_commit();
         if (variable_get('cache', 0) && ($cache = drupal_page_set_cache())) {
           drupal_serve_page_from_cache($cache);
+        }
         else {
           ob_flush();
+        }
         _registry_check_code(REGISTRY_WRITE_LOOKUP_CACHE);
         drupal_cache_system_paths();
         module_implements_write_cache();
         drupal_file_scan_write_cache();
         system_run_automated_cron();
+      }
       /**
        * Performs end-of-request tasks.
+       *
        * In some cases page requests need to end without calling drupal_page_footer().
        * In these cases, call drupal_exit() instead. There should rarely be a reason
        * to call exit instead of drupal_exit();
+       *
        * @param $destination
        *   If this function is called from drupal_goto(), then this argument
        *   will be a fully-qualified URL that is the destination of the redirect.
        *   This should be passed along to hook_exit() implementations.
        */
       function drupal_exit($destination = NULL) {
         if (drupal_get_bootstrap_phase() == DRUPAL_BOOTSTRAP_FULL) {
           if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
             module_invoke_all('exit', $destination);
+          }
           drupal_session_commit();
+        }
         exit;
+      }
       /**
        * Forms an associative array from a linear array.
+       *
        * This function walks through the provided array and constructs an associative
        * array out of it. The keys of the resulting array will be the values of the
        * input array. The values will be the same as the keys unless a function is
        * specified, in which case the output of the function is used for the values
        * instead.
+       *
        * @param $array
        *   A linear array.
        * @param $function
        *   A name of a function to apply to all values before output.
+       *
        * @return
        *   An associative array.
        */
       function drupal_map_assoc($array, $function = NULL) {
         // array_combine() fails with empty arrays:
         // http://bugs.php.net/bug.php?id=34857.
         $array = !empty($array) ? array_combine($array, $array) : array();
         if (is_callable($function)) {
           $array = array_map($function, $array);
+        }
         return $array;
+      }
       /**
        * Attempts to set the PHP maximum execution time.
+       *
        * This function is a wrapper around the PHP function set_time_limit().
        * When called, set_time_limit() restarts the timeout counter from zero.
        * In other words, if the timeout is the default 30 seconds, and 25 seconds
        * into script execution a call such as set_time_limit(20) is made, the
        * script will run for a total of 45 seconds before timing out.
+       *
        * If the current time limit is not unlimited it is possible to decrease the
        * total time limit if the sum of the new time limit and the current time spent
        * running the script is inferior to the original time limit. It is inherent to
        * the way set_time_limit() works, it should rather be called with an
        * appropriate value every time you need to allocate a certain amount of time
        * to execute a task than only once at the beginning of the script.
+       *
        * Before calling set_time_limit(), we check if this function is available
        * because it could be disabled by the server administrator. We also hide all
        * the errors that could occur when calling set_time_limit(), because it is
        * not possible to reliably ensure that PHP or a security extension will
        * not issue a warning/error if they prevent the use of this function.
+       *
        * @param $time_limit
        *   An integer specifying the new time limit, in seconds. A value of 0
        *   indicates unlimited execution time.
+       *
        * @ingroup php_wrappers
        */
       function drupal_set_time_limit($time_limit) {
         if (function_exists('set_time_limit')) {
           $current = ini_get('max_execution_time');
           // Do not set time limit if it is currently unlimited.
           if ($current != 0) {
             @set_time_limit($time_limit);
+          }
+        }
+      }
       /**
        * Returns the path to a system item (module, theme, etc.).
+       *
        * @param $type
        *   The type of the item (i.e. theme, theme_engine, module, profile).
        * @param $name
        *   The name of the item for which the path is requested.
+       *
        * @return
        *   The path to the requested item or an empty string if the item is not found.
        */
       function drupal_get_path($type, $name) {
         return dirname(drupal_get_filename($type, $name));
+      }
       /**
        * Returns the base URL path (i.e., directory) of the Drupal installation.
+       *
        * base_path() adds a "/" to the beginning and end of the returned path if the
        * path is not empty. At the very least, this will return "/".
+       *
        * Examples:
        * - http://example.com returns "/" because the path is empty.
        * - http://example.com/drupal/folder returns "/drupal/folder/".
        */
       function base_path() {
         return $GLOBALS['base_path'];
+      }
       /**
        * Adds a LINK tag with a distinct 'rel' attribute to the page's HEAD.
+       *
        * This function can be called as long the HTML header hasn't been sent, which
        * on normal pages is up through the preprocess step of theme('html'). Adding
        * a link will overwrite a prior link with the exact same 'rel' and 'href'
        * attributes.
+       *
        * @param $attributes
        *   Associative array of element attributes including 'href' and 'rel'.
        * @param $header
        *   Optional flag to determine if a HTTP 'Link:' header should be sent.
        */
       function drupal_add_html_head_link($attributes, $header = FALSE) {
         $element = array(
           '#tag' => 'link',
           '#attributes' => $attributes,
         );
         $href = $attributes['href'];
         if ($header) {
           // Also add a HTTP header "Link:".
           $href = '<' . check_plain($attributes['href']) . '>;';
           unset($attributes['href']);
           $element['#attached']['drupal_add_http_header'][] = array('Link',  $href . drupal_http_header_attributes($attributes), TRUE);
+        }
         drupal_add_html_head($element, 'drupal_add_html_head_link:' . $attributes['rel'] . ':' . $href);
+      }
       /**
        * Adds a cascading stylesheet to the stylesheet queue.
+       *
        * Calling drupal_static_reset('drupal_add_css') will clear all cascading
        * stylesheets added so far.
+       *
        * If CSS aggregation/compression is enabled, all cascading style sheets added
        * with $options['preprocess'] set to TRUE will be merged into one aggregate
        * file and compressed by removing all extraneous white space.
        * Preprocessed inline stylesheets will not be aggregated into this single file;
        * instead, they are just compressed upon output on the page. Externally hosted
        * stylesheets are never aggregated or compressed.
+       *
        * The reason for aggregating the files is outlined quite thoroughly here:
        * http://www.die.net/musings/page_load_time/ "Load fewer external objects. Due
        * to request overhead, one bigger file just loads faster than two smaller ones
        * half its size."
+       *
        * $options['preprocess'] should be only set to TRUE when a file is required for
        * all typical visitors and most pages of a site. It is critical that all
        * preprocessed files are added unconditionally on every page, even if the
        * files do not happen to be needed on a page. This is normally done by calling
        * drupal_add_css() in a hook_init() implementation.
+       *
        * Non-preprocessed files should only be added to the page when they are
        * actually needed.
+       *
        * @param $data
        *   (optional) The stylesheet data to be added, depending on what is passed
        *   through to the $options['type'] parameter:
        *   - 'file': The path to the CSS file relative to the base_path(), or a
        *     stream wrapper URI. For example: "modules/devel/devel.css" or
        *     "public://generated_css/stylesheet_1.css". Note that Modules should
        *     always prefix the names of their CSS files with the module name; for
        *     example, system-menus.css rather than simply menus.css. Themes can
        *     override module-supplied CSS files based on their filenames, and this
        *     prefixing helps prevent confusing name collisions for theme developers.
        *     See drupal_get_css() where the overrides are performed. Also, if the
        *     direction of the current language is right-to-left (Hebrew, Arabic,
        *     etc.), the function will also look for an RTL CSS file and append it to
        *     the list. The name of this file should have an '-rtl.css' suffix. For
        *     example, a CSS file called 'mymodule-name.css' will have a
        *     'mymodule-name-rtl.css' file added to the list, if exists in the same
        *     directory. This CSS file should contain overrides for properties which
        *     should be reversed or otherwise different in a right-to-left display.
        *   - 'inline': A string of CSS that should be placed in the given scope. Note
        *     that it is better practice to use 'file' stylesheets, rather than
        *     'inline', as the CSS would then be aggregated and cached.
        *   - 'external': The absolute path to an external CSS file that is not hosted
        *     on the local server. These files will not be aggregated if CSS
        *     aggregation is enabled.
        * @param $options
        *   (optional) A string defining the 'type' of CSS that is being added in the
        *   $data parameter ('file', 'inline', or 'external'), or an array which can
        *   have any or all of the following keys:
        *   - 'type': The type of stylesheet being added. Available options are 'file',
        *     'inline' or 'external'. Defaults to 'file'.
        *   - 'basename': Force a basename for the file being added. Modules are
        *     expected to use stylesheets with unique filenames, but integration of
        *     external libraries may make this impossible. The basename of
        *     'modules/node/node.css' is 'node.css'. If the external library "node.js"
        *     ships with a 'node.css', then a different, unique basename would be
        *     'node.js.css'.
        *   - 'group': A number identifying the group in which to add the stylesheet.
        *     Available constants are:
        *     - CSS_SYSTEM: Any system-layer CSS.
        *     - CSS_DEFAULT: (default) Any module-layer CSS.
        *     - CSS_THEME: Any theme-layer CSS.
        *     The group number serves as a weight: the markup for loading a stylesheet
        *     within a lower weight group is output to the page before the markup for
        *     loading a stylesheet within a higher weight group, so CSS within higher
        *     weight groups take precendence over CSS within lower weight groups.
        *   - 'every_page': For optimal front-end performance when aggregation is
        *     enabled, this should be set to TRUE if the stylesheet is present on every
        *     page of the website for users for whom it is present at all. This
        *     defaults to FALSE. It is set to TRUE for stylesheets added via module and
        *     theme .info files. Modules that add stylesheets within hook_init()
        *     implementations, or from other code that ensures that the stylesheet is
        *     added to all website pages, should also set this flag to TRUE. All
        *     stylesheets within the same group that have the 'every_page' flag set to
        *     TRUE and do not have 'preprocess' set to FALSE are aggregated together
        *     into a single aggregate file, and that aggregate file can be reused
        *     across a user's entire site visit, leading to faster navigation between
        *     pages. However, stylesheets that are only needed on pages less frequently
        *     visited, can be added by code that only runs for those particular pages,
        *     and that code should not set the 'every_page' flag. This minimizes the
        *     size of the aggregate file that the user needs to download when first
        *     visiting the website. Stylesheets without the 'every_page' flag are
        *     aggregated into a separate aggregate file. This other aggregate file is
        *     likely to change from page to page, and each new aggregate file needs to
        *     be downloaded when first encountered, so it should be kept relatively
        *     small by ensuring that most commonly needed stylesheets are added to
        *     every page.
        *   - 'weight': The weight of the stylesheet specifies the order in which the
        *     CSS will appear relative to other stylesheets with the same group and
        *     'every_page' flag. The exact ordering of stylesheets is as follows:
        *     - First by group.
        *     - Then by the 'every_page' flag, with TRUE coming before FALSE.
        *     - Then by weight.
        *     - Then by the order in which the CSS was added. For example, all else
        *       being the same, a stylesheet added by a call to drupal_add_css() that
        *       happened later in the page request gets added to the page after one for
        *       which drupal_add_css() happened earlier in the page request.
        *   - 'media': The media type for the stylesheet, e.g., all, print, screen.
        *     Defaults to 'all'.
        *   - 'preprocess': If TRUE and CSS aggregation/compression is enabled, the
        *     styles will be aggregated and compressed. Defaults to TRUE.
        *   - 'browsers': An array containing information specifying which browsers
        *     should load the CSS item. See drupal_pre_render_conditional_comments()
        *     for details.
+       *
        * @return
        *   An array of queued cascading stylesheets.
+       *
        * @see drupal_get_css()
        */
       function drupal_add_css($data = NULL, $options = NULL) {
         $css = &drupal_static(__FUNCTION__, array());
         $count = &drupal_static(__FUNCTION__ . '_count', 0);
         // If the $css variable has been reset with drupal_static_reset(), there is
         // no longer any CSS being tracked, so set the counter back to 0 also.
         if (count($css) === 0) {
           $count = 0;
+        }
         // Construct the options, taking the defaults into consideration.
         if (isset($options)) {
           if (!is_array($options)) {
             $options = array('type' => $options);
+          }
+        }
         else {
           $options = array();
+        }
         // Create an array of CSS files for each media type first, since each type needs to be served
         // to the browser differently.
         if (isset($data)) {
           $options += array(
             'type' => 'file',
             'group' => CSS_DEFAULT,
             'weight' => 0,
             'every_page' => FALSE,
             'media' => 'all',
             'preprocess' => TRUE,
             'data' => $data,
             'browsers' => array(),
           );
           $options['browsers'] += array(
             'IE' => TRUE,
             '!IE' => TRUE,
           );
           // Files with a query string cannot be preprocessed.
           if ($options['type'] === 'file' && $options['preprocess'] && strpos($options['data'], '?') !== FALSE) {
             $options['preprocess'] = FALSE;
+          }
           // Always add a tiny value to the weight, to conserve the insertion order.
           $options['weight'] += $count / 1000;
           $count++;
           // Add the data to the CSS array depending on the type.
           switch ($options['type']) {
             case 'inline':
               // For inline stylesheets, we don't want to use the $data as the array
               // key as $data could be a very long string of CSS.
               $css[] = $options;
               break;
             default:
               // Local and external files must keep their name as the associative key
               // so the same CSS file is not be added twice.
               $css[$data] = $options;
+          }
+        }
         return $css;
+      }
       /**
        * Returns a themed representation of all stylesheets to attach to the page.
+       *
        * It loads the CSS in order, with 'module' first, then 'theme' afterwards.
        * This ensures proper cascading of styles so themes can easily override
        * module styles through CSS selectors.
+       *
        * Themes may replace module-defined CSS files by adding a stylesheet with the
        * same filename. For example, themes/bartik/system-menus.css would replace
        * modules/system/system-menus.css. This allows themes to override complete
        * CSS files, rather than specific selectors, when necessary.
+       *
        * If the original CSS file is being overridden by a theme, the theme is
        * responsible for supplying an accompanying RTL CSS file to replace the
        * module's.
+       *
        * @param $css
        *   (optional) An array of CSS files. If no array is provided, the default
        *   stylesheets array is used instead.
        * @param $skip_alter
        *   (optional) If set to TRUE, this function skips calling drupal_alter() on
        *   $css, useful when the calling function passes a $css array that has already
        *   been altered.
+       *
        * @return
        *   A string of XHTML CSS tags.
+       *
        * @see drupal_add_css()
        */
       function drupal_get_css($css = NULL, $skip_alter = FALSE) {
         if (!isset($css)) {
           $css = drupal_add_css();
+        }
         // Allow modules and themes to alter the CSS items.
         if (!$skip_alter) {
           drupal_alter('css', $css);
+        }
         // Sort CSS items, so that they appear in the correct order.
         uasort($css, 'drupal_sort_css_js');
         // Provide the page with information about the individual CSS files used,
         // information not otherwise available when CSS aggregation is enabled. The
         // setting is attached later in this function, but is set here, so that CSS
         // files removed below are still considered "used" and prevented from being
         // added in a later AJAX request.
         // Skip if no files were added to the page or jQuery.extend() will overwrite
         // the Drupal.settings.ajaxPageState.css object with an empty array.
         if (!empty($css)) {
           // Cast the array to an object to be on the safe side even if not empty.
           $setting['ajaxPageState']['css'] = (object) array_fill_keys(array_keys($css), 1);
+        }
         // Remove the overridden CSS files. Later CSS files override former ones.
         $previous_item = array();
         foreach ($css as $key => $item) {
           if ($item['type'] == 'file') {
             // If defined, force a unique basename for this file.
             $basename = isset($item['basename']) ? $item['basename'] : drupal_basename($item['data']);
             if (isset($previous_item[$basename])) {
               // Remove the previous item that shared the same base name.
               unset($css[$previous_item[$basename]]);
+            }
             $previous_item[$basename] = $key;
+          }
+        }
         // Render the HTML needed to load the CSS.
         $styles = array(
           '#type' => 'styles',
           '#items' => $css,
         );
         if (!empty($setting)) {
           $styles['#attached']['js'][] = array('type' => 'setting', 'data' => $setting);
+        }
         return drupal_render($styles);
+      }
       /**
        * Sorts CSS and JavaScript resources.
+       *
        * Callback for uasort() within:
        * - drupal_get_css()
        * - drupal_get_js()
+       *
        * This sort order helps optimize front-end performance while providing modules
        * and themes with the necessary control for ordering the CSS and JavaScript
        * appearing on a page.
+       *
        * @param $a
        *   First item for comparison. The compared items should be associative arrays
        *   of member items from drupal_add_css() or drupal_add_js().
        * @param $b
        *   Second item for comparison.
+       *
        * @see drupal_add_css()
        * @see drupal_add_js()
        */
       function drupal_sort_css_js($a, $b) {
         // First order by group, so that, for example, all items in the CSS_SYSTEM
         // group appear before items in the CSS_DEFAULT group, which appear before
         // all items in the CSS_THEME group. Modules may create additional groups by
         // defining their own constants.
         if ($a['group'] < $b['group']) {
           return -1;
+        }
         elseif ($a['group'] > $b['group']) {
           return 1;
+        }
         // Within a group, order all infrequently needed, page-specific files after
         // common files needed throughout the website. Separating this way allows for
         // the aggregate file generated for all of the common files to be reused
         // across a site visit without being cut by a page using a less common file.
         elseif ($a['every_page'] && !$b['every_page']) {
           return -1;
+        }
         elseif (!$a['every_page'] && $b['every_page']) {
           return 1;
+        }
         // Finally, order by weight.
         elseif ($a['weight'] < $b['weight']) {
           return -1;
+        }
         elseif ($a['weight'] > $b['weight']) {
           return 1;
+        }
         else {
           return 0;
+        }
+      }
       /**
        * Default callback to group CSS items.
+       *
        * This function arranges the CSS items that are in the #items property of the
        * styles element into groups. Arranging the CSS items into groups serves two
        * purposes. When aggregation is enabled, files within a group are aggregated
        * into a single file, significantly improving page loading performance by
        * minimizing network traffic overhead. When aggregation is disabled, grouping
        * allows multiple files to be loaded from a single STYLE tag, enabling sites
        * with many modules enabled or a complex theme being used to stay within IE's
        * 31 CSS inclusion tag limit: http://drupal.org/node/228818.
+       *
        * This function puts multiple items into the same group if they are groupable
        * and if they are for the same 'media' and 'browsers'. Items of the 'file' type
        * are groupable if their 'preprocess' flag is TRUE, items of the 'inline' type
        * are always groupable, and items of the 'external' type are never groupable.
        * This function also ensures that the process of grouping items does not change
        * their relative order. This requirement may result in multiple groups for the
        * same type, media, and browsers, if needed to accommodate other items in
        * between.
+       *
        * @param $css
        *   An array of CSS items, as returned by drupal_add_css(), but after
        *   alteration performed by drupal_get_css().
+       *
        * @return
        *   An array of CSS groups. Each group contains the same keys (e.g., 'media',
        *   'data', etc.) as a CSS item from the $css parameter, with the value of
        *   each key applying to the group as a whole. Each group also contains an
        *   'items' key, which is the subset of items from $css that are in the group.
+       *
        * @see drupal_pre_render_styles()
        * @see system_element_info()
        */
       function drupal_group_css($css) {
         $groups = array();
         // If a group can contain multiple items, we track the information that must
         // be the same for each item in the group, so that when we iterate the next
         // item, we can determine if it can be put into the current group, or if a
         // new group needs to be made for it.
         $current_group_keys = NULL;
         // When creating a new group, we pre-increment $i, so by initializing it to
         // -1, the first group will have index 0.
         $i = -1;
         foreach ($css as $item) {
           // The browsers for which the CSS item needs to be loaded is part of the
           // information that determines when a new group is needed, but the order of
           // keys in the array doesn't matter, and we don't want a new group if all
           // that's different is that order.
           ksort($item['browsers']);
           // If the item can be grouped with other items, set $group_keys to an array
           // of information that must be the same for all items in its group. If the
           // item can't be grouped with other items, set $group_keys to FALSE. We
           // put items into a group that can be aggregated together: whether they will
           // be aggregated is up to the _drupal_css_aggregate() function or an
           // override of that function specified in hook_css_alter(), but regardless
           // of the details of that function, a group represents items that can be
           // aggregated. Since a group may be rendered with a single HTML tag, all
           // items in the group must share the same information that would need to be
           // part of that HTML tag.
           switch ($item['type']) {
             case 'file':
               // Group file items if their 'preprocess' flag is TRUE.
               // Help ensure maximum reuse of aggregate files by only grouping
               // together items that share the same 'group' value and 'every_page'
               // flag. See drupal_add_css() for details about that.
               $group_keys = $item['preprocess'] ? array($item['type'], $item['group'], $item['every_page'], $item['media'], $item['browsers']) : FALSE;
               break;
             case 'inline':
               // Always group inline items.
               $group_keys = array($item['type'], $item['media'], $item['browsers']);
               break;
             case 'external':
               // Do not group external items.
               $group_keys = FALSE;
               break;
+          }
           // If the group keys don't match the most recent group we're working with,
           // then a new group must be made.
           if ($group_keys !== $current_group_keys) {
             $i++;
             // Initialize the new group with the same properties as the first item
             // being placed into it. The item's 'data' and 'weight' properties are
             // unique to the item and should not be carried over to the group.
             $groups[$i] = $item;
             unset($groups[$i]['data'], $groups[$i]['weight']);
             $groups[$i]['items'] = array();
             $current_group_keys = $group_keys ? $group_keys : NULL;
+          }
           // Add the item to the current group.
           $groups[$i]['items'][] = $item;
+        }
         return $groups;
+      }
       /**
        * Default callback to aggregate CSS files and inline content.
+       *
        * Having the browser load fewer CSS files results in much faster page loads
        * than when it loads many small files. This function aggregates files within
        * the same group into a single file unless the site-wide setting to do so is
        * disabled (commonly the case during site development). To optimize download,
        * it also compresses the aggregate files by removing comments, whitespace, and
        * other unnecessary content. Additionally, this functions aggregates inline
        * content together, regardless of the site-wide aggregation setting.
+       *
        * @param $css_groups
        *   An array of CSS groups as returned by drupal_group_css(). This function
        *   modifies the group's 'data' property for each group that is aggregated.
+       *
        * @see drupal_group_css()
        * @see drupal_pre_render_styles()
        * @see system_element_info()
        */
       function drupal_aggregate_css(&$css_groups) {
         $preprocess_css = (variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
         // For each group that needs aggregation, aggregate its items.
         foreach ($css_groups as $key => $group) {
           switch ($group['type']) {
             // If a file group can be aggregated into a single file, do so, and set
             // the group's data property to the file path of the aggregate file.
             case 'file':
               if ($group['preprocess'] && $preprocess_css) {
                 $css_groups[$key]['data'] = drupal_build_css_cache($group['items']);
+              }
               break;
             // Aggregate all inline CSS content into the group's data property.
             case 'inline':
               $css_groups[$key]['data'] = '';
               foreach ($group['items'] as $item) {
                 $css_groups[$key]['data'] .= drupal_load_stylesheet_content($item['data'], $item['preprocess']);
+              }
               break;
+          }
+        }
+      }
       /**
        * #pre_render callback to add the elements needed for CSS tags to be rendered.
+       *
        * For production websites, LINK tags are preferable to STYLE tags with @import
        * statements, because:
        * - They are the standard tag intended for linking to a resource.
        * - On Firefox 2 and perhaps other browsers, CSS files included with @import
        *   statements don't get saved when saving the complete web page for offline
        *   use: http://drupal.org/node/145218.
        * - On IE, if only LINK tags and no @import statements are used, all the CSS
        *   files are downloaded in parallel, resulting in faster page load, but if
        *   @import statements are used and span across multiple STYLE tags, all the
        *   ones from one STYLE tag must be downloaded before downloading begins for
        *   the next STYLE tag. Furthermore, IE7 does not support media declaration on
        *   the @import statement, so multiple STYLE tags must be used when different
        *   files are for different media types. Non-IE browsers always download in
        *   parallel, so this is an IE-specific performance quirk:
        *   http://www.stevesouders.com/blog/2009/04/09/dont-use-import/.
+       *
        * However, IE has an annoying limit of 31 total CSS inclusion tags
        * (http://drupal.org/node/228818) and LINK tags are limited to one file per
        * tag, whereas STYLE tags can contain multiple @import statements allowing
        * multiple files to be loaded per tag. When CSS aggregation is disabled, a
        * Drupal site can easily have more than 31 CSS files that need to be loaded, so
        * using LINK tags exclusively would result in a site that would display
        * incorrectly in IE. Depending on different needs, different strategies can be
        * employed to decide when to use LINK tags and when to use STYLE tags.
+       *
        * The strategy employed by this function is to use LINK tags for all aggregate
        * files and for all files that cannot be aggregated (e.g., if 'preprocess' is
        * set to FALSE or the type is 'external'), and to use STYLE tags for groups
        * of files that could be aggregated together but aren't (e.g., if the site-wide
        * aggregation setting is disabled). This results in all LINK tags when
        * aggregation is enabled, a guarantee that as many or only slightly more tags
        * are used with aggregation disabled than enabled (so that if the limit were to
        * be crossed with aggregation enabled, the site developer would also notice the
        * problem while aggregation is disabled), and an easy way for a developer to
        * view HTML source while aggregation is disabled and know what files will be
        * aggregated together when aggregation becomes enabled.
+       *
        * This function evaluates the aggregation enabled/disabled condition on a group
        * by group basis by testing whether an aggregate file has been made for the
        * group rather than by testing the site-wide aggregation setting. This allows
        * this function to work correctly even if modules have implemented custom
        * logic for grouping and aggregating files.
+       *
        * @param $element
        *   A render array containing:
        *   - '#items': The CSS items as returned by drupal_add_css() and altered by
        *     drupal_get_css().
        *   - '#group_callback': A function to call to group #items to enable the use
        *     of fewer tags by aggregating files and/or using multiple @import
        *     statements within a single tag.
        *   - '#aggregate_callback': A function to call to aggregate the items within
        *     the groups arranged by the #group_callback function.
+       *
        * @return
        *   A render array that will render to a string of XHTML CSS tags.
+       *
        * @see drupal_get_css()
        */
       function drupal_pre_render_styles($elements) {
         // Group and aggregate the items.
         if (isset($elements['#group_callback'])) {
           $elements['#groups'] = $elements['#group_callback']($elements['#items']);
+        }
         if (isset($elements['#aggregate_callback'])) {
           $elements['#aggregate_callback']($elements['#groups']);
+        }
         // A dummy query-string is added to filenames, to gain control over
         // browser-caching. The string changes on every update or full cache
         // flush, forcing browsers to load a new copy of the files, as the
         // URL changed.
         $query_string = variable_get('css_js_query_string', '0');
         // For inline CSS to validate as XHTML, all CSS containing XHTML needs to be
         // wrapped in CDATA. To make that backwards compatible with HTML 4, we need to
         // comment out the CDATA-tag.
         $embed_prefix = "\n<!--/*--><![CDATA[/*><!--*/\n";
         $embed_suffix = "\n/*]]>*/-->\n";
         // Defaults for LINK and STYLE elements.
         $link_element_defaults = array(
           '#type' => 'html_tag',
           '#tag' => 'link',
           '#attributes' => array(
             'type' => 'text/css',
             'rel' => 'stylesheet',
           ),
         );
         $style_element_defaults = array(
           '#type' => 'html_tag',
           '#tag' => 'style',
           '#attributes' => array(
             'type' => 'text/css',
           ),
         );
         // Loop through each group.
         foreach ($elements['#groups'] as $group) {
           switch ($group['type']) {
             // For file items, there are three possibilites.
             // - The group has been aggregated: in this case, output a LINK tag for
             //   the aggregate file.
             // - The group can be aggregated but has not been (most likely because
             //   the site administrator disabled the site-wide setting): in this case,
             //   output as few STYLE tags for the group as possible, using @import
             //   statement for each file in the group. This enables us to stay within
             //   IE's limit of 31 total CSS inclusion tags.
             // - The group contains items not eligible for aggregation (their
             //   'preprocess' flag has been set to FALSE): in this case, output a LINK
             //   tag for each file.
             case 'file':
               // The group has been aggregated into a single file: output a LINK tag
               // for the aggregate file.
               if (isset($group['data'])) {
                 $element = $link_element_defaults;
                 $element['#attributes']['href'] = file_create_url($group['data']);
                 $element['#attributes']['media'] = $group['media'];
                 $element['#browsers'] = $group['browsers'];
                 $elements[] = $element;
+              }
               // The group can be aggregated, but hasn't been: combine multiple items
               // into as few STYLE tags as possible.
               elseif ($group['preprocess']) {
                 $import = array();
                 foreach ($group['items'] as $item) {
                   // A theme's .info file may have an entry for a file that doesn't
                   // exist as a way of overriding a module or base theme CSS file from
                   // being added to the page. Normally, file_exists() calls that need
                   // to run for every page request should be minimized, but this one
                   // is okay, because it only runs when CSS aggregation is disabled.
                   // On a server under heavy enough load that file_exists() calls need
                   // to be minimized, CSS aggregation should be enabled, in which case
                   // this code is not run. When aggregation is enabled,
                   // drupal_load_stylesheet() checks file_exists(), but only when
                   // building the aggregate file, which is then reused for many page
                   // requests.
                   if (file_exists($item['data'])) {
                     // The dummy query string needs to be added to the URL to control
                     // browser-caching. IE7 does not support a media type on the
                     // @import statement, so we instead specify the media for the
                     // group on the STYLE tag.
                     $import[] = '@import url("' . check_plain(file_create_url($item['data']) . '?' . $query_string) . '");';
+                  }
+                }
                 // In addition to IE's limit of 31 total CSS inclusion tags, it also
                 // has a limit of 31 @import statements per STYLE tag.
                 while (!empty($import)) {
                   $import_batch = array_slice($import, 0, 31);
                   $import = array_slice($import, 31);
                   $element = $style_element_defaults;
                   // This simplifies the JavaScript regex, allowing each line
                   // (separated by \n) to be treated as a completely different string.
                   // This means that we can use ^ and $ on one line at a time, and not
                   // worry about style tags since they'll never match the regex.
                   $element['#value'] = "\n" . implode("\n", $import_batch) . "\n";
                   $element['#attributes']['media'] = $group['media'];
                   $element['#browsers'] = $group['browsers'];
                   $elements[] = $element;
+                }
+              }
               // The group contains items ineligible for aggregation: output a LINK
               // tag for each file.
               else {
                 foreach ($group['items'] as $item) {
                   $element = $link_element_defaults;
                   // We do not check file_exists() here, because this code runs for
                   // files whose 'preprocess' is set to FALSE, and therefore, even
                   // when aggregation is enabled, and we want to avoid needlessly
                   // taxing a server that may be under heavy load. The file_exists()
                   // performed above for files whose 'preprocess' is TRUE is done for
                   // the benefit of theme .info files, but code that deals with files
                   // whose 'preprocess' is FALSE is responsible for ensuring the file
                   // exists.
                   // The dummy query string needs to be added to the URL to control
                   // browser-caching.
                   $query_string_separator = (strpos($item['data'], '?') !== FALSE) ? '&' : '?';
                   $element['#attributes']['href'] = file_create_url($item['data']) . $query_string_separator . $query_string;
                   $element['#attributes']['media'] = $item['media'];
                   $element['#browsers'] = $group['browsers'];
                   $elements[] = $element;
+                }
+              }
               break;
             // For inline content, the 'data' property contains the CSS content. If
             // the group's 'data' property is set, then output it in a single STYLE
             // tag. Otherwise, output a separate STYLE tag for each item.
             case 'inline':
               if (isset($group['data'])) {
                 $element = $style_element_defaults;
                 $element['#value'] = $group['data'];
                 $element['#value_prefix'] = $embed_prefix;
                 $element['#value_suffix'] = $embed_suffix;
                 $element['#attributes']['media'] = $group['media'];
                 $element['#browsers'] = $group['browsers'];
                 $elements[] = $element;
+              }
               else {
                 foreach ($group['items'] as $item) {
                   $element = $style_element_defaults;
                   $element['#value'] = $item['data'];
                   $element['#value_prefix'] = $embed_prefix;
                   $element['#value_suffix'] = $embed_suffix;
                   $element['#attributes']['media'] = $item['media'];
                   $element['#browsers'] = $group['browsers'];
                   $elements[] = $element;
+                }
+              }
               break;
             // Output a LINK tag for each external item. The item's 'data' property
             // contains the full URL.
             case 'external':
               foreach ($group['items'] as $item) {
                 $element = $link_element_defaults;
                 $element['#attributes']['href'] = $item['data'];
                 $element['#attributes']['media'] = $item['media'];
                 $element['#browsers'] = $group['browsers'];
                 $elements[] = $element;
+              }
               break;
+          }
+        }
         return $elements;
+      }
       /**
        * Aggregates and optimizes CSS files into a cache file in the files directory.
+       *
        * The file name for the CSS cache file is generated from the hash of the
        * aggregated contents of the files in $css. This forces proxies and browsers
        * to download new CSS when the CSS changes.
+       *
        * The cache file name is retrieved on a page load via a lookup variable that
        * contains an associative array. The array key is the hash of the file names
        * in $css while the value is the cache file name. The cache file is generated
        * in two cases. First, if there is no file name value for the key, which will
        * happen if a new file name has been added to $css or after the lookup
        * variable is emptied to force a rebuild of the cache. Second, the cache file
        * is generated if it is missing on disk. Old cache files are not deleted
        * immediately when the lookup variable is emptied, but are deleted after a set
        * period by drupal_delete_file_if_stale(). This ensures that files referenced
        * by a cached page will still be available.
+       *
        * @param $css
        *   An array of CSS files to aggregate and compress into one file.
+       *
        * @return
        *   The URI of the CSS cache file, or FALSE if the file could not be saved.
        */
       function drupal_build_css_cache($css) {
         $data = '';
         $uri = '';
         $map = variable_get('drupal_css_cache_files', array());
         // Create a new array so that only the file names are used to create the hash.
         // This prevents new aggregates from being created unnecessarily.
         $css_data = array();
         foreach ($css as $css_file) {
           $css_data[] = $css_file['data'];
+        }
         $key = hash('sha256', serialize($css_data));
         if (isset($map[$key])) {
           $uri = $map[$key];
+        }
         if (empty($uri) || !file_exists($uri)) {
           // Build aggregate CSS file.
           foreach ($css as $stylesheet) {
             // Only 'file' stylesheets can be aggregated.
             if ($stylesheet['type'] == 'file') {
               $contents = drupal_load_stylesheet($stylesheet['data'], TRUE);
               // Build the base URL of this CSS file: start with the full URL.
               $css_base_url = file_create_url($stylesheet['data']);
               // Move to the parent.
               $css_base_url = substr($css_base_url, 0, strrpos($css_base_url, '/'));
               // Simplify to a relative URL if the stylesheet URL starts with the
               // base URL of the website.
               if (substr($css_base_url, 0, strlen($GLOBALS['base_root'])) == $GLOBALS['base_root']) {
                 $css_base_url = substr($css_base_url, strlen($GLOBALS['base_root']));
+              }
               _drupal_build_css_path(NULL, $css_base_url . '/');
               // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
               $data .= preg_replace_callback('/url\(\s*[\'"]?(?![a-z]+:|\/+)([^\'")]+)[\'"]?\s*\)/i', '_drupal_build_css_path', $contents);
+            }
+          }
           // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
           // @import rules must proceed any other style, so we move those to the top.
           $regexp = '/@import[^;]+;/i';
           preg_match_all($regexp, $data, $matches);
           $data = preg_replace($regexp, '', $data);
           $data = implode('', $matches[0]) . $data;
           // Prefix filename to prevent blocking by firewalls which reject files
           // starting with "ad*".
           $filename = 'css_' . drupal_hash_base64($data) . '.css';
           // Create the css/ within the files folder.
           $csspath = 'public://css';
           $uri = $csspath . '/' . $filename;
           // Create the CSS file.
           file_prepare_directory($csspath, FILE_CREATE_DIRECTORY);
           if (!file_exists($uri) && !file_unmanaged_save_data($data, $uri, FILE_EXISTS_REPLACE)) {
             return FALSE;
+          }
           // If CSS gzip compression is enabled, clean URLs are enabled (which means
           // that rewrite rules are working) and the zlib extension is available then
           // create a gzipped version of this file. This file is served conditionally
           // to browsers that accept gzip using .htaccess rules.
           if (variable_get('css_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
             if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
               return FALSE;
+            }
+          }
           // Save the updated map.
           $map[$key] = $uri;
           variable_set('drupal_css_cache_files', $map);
+        }
         return $uri;
+      }
       /**
        * Prefixes all paths within a CSS file for drupal_build_css_cache().
        */
       function _drupal_build_css_path($matches, $base = NULL) {
         $_base = &drupal_static(__FUNCTION__);
         // Store base path for preg_replace_callback.
         if (isset($base)) {
           $_base = $base;
+        }
         // Prefix with base and remove '../' segments where possible.
         $path = $_base . $matches[1];
         $last = '';
         while ($path != $last) {
           $last = $path;
           $path = preg_replace('`(^|/)(?!\.\./)([^/]+)/\.\./`', '$1', $path);
+        }
         return 'url(' . $path . ')';
+      }
       /**
        * Loads the stylesheet and resolves all @import commands.
+       *
        * Loads a stylesheet and replaces @import commands with the contents of the
        * imported file. Use this instead of file_get_contents when processing
        * stylesheets.
+       *
        * The returned contents are compressed removing white space and comments only
        * when CSS aggregation is enabled. This optimization will not apply for
        * color.module enabled themes with CSS aggregation turned off.
+       *
        * @param $file
        *   Name of the stylesheet to be processed.
        * @param $optimize
        *   Defines if CSS contents should be compressed or not.
        * @param $reset_basepath
        *   Used internally to facilitate recursive resolution of @import commands.
+       *
        * @return
        *   Contents of the stylesheet, including any resolved @import commands.
        */
       function drupal_load_stylesheet($file, $optimize = NULL, $reset_basepath = TRUE) {
         // These statics are not cache variables, so we don't use drupal_static().
         static $_optimize, $basepath;
         if ($reset_basepath) {
           $basepath = '';
+        }
         // Store the value of $optimize for preg_replace_callback with nested
         // @import loops.
         if (isset($optimize)) {
           $_optimize = $optimize;
+        }
         // Stylesheets are relative one to each other. Start by adding a base path
         // prefix provided by the parent stylesheet (if necessary).
         if ($basepath && !file_uri_scheme($file)) {
           $file = $basepath . '/' . $file;
+        }
         // Store the parent base path to restore it later.
         $parent_base_path = $basepath;
         // Set the current base path to process possible child imports.
         $basepath = dirname($file);
         // Load the CSS stylesheet. We suppress errors because themes may specify
         // stylesheets in their .info file that don't exist in the theme's path,
         // but are merely there to disable certain module CSS files.
         $content = '';
         if ($contents = @file_get_contents($file)) {
           // Return the processed stylesheet.
           $content = drupal_load_stylesheet_content($contents, $_optimize);
+        }
         // Restore the parent base path as the file and its childen are processed.
         $basepath = $parent_base_path;
         return $content;
+      }
       /**
        * Processes the contents of a stylesheet for aggregation.
+       *
        * @param $contents
        *   The contents of the stylesheet.
        * @param $optimize
        *   (optional) Boolean whether CSS contents should be minified. Defaults to
        *   FALSE.
+       *
        * @return
        *   Contents of the stylesheet including the imported stylesheets.
        */
       function drupal_load_stylesheet_content($contents, $optimize = FALSE) {
         // Remove multiple charset declarations for standards compliance (and fixing Safari problems).
         $contents = preg_replace('/^@charset\s+[\'"](\S*?)\b[\'"];/i', '', $contents);
         if ($optimize) {
           // Perform some safe CSS optimizations.
           // Regexp to match comment blocks.
           $comment     = '/\*[^*]*\*+(?:[^/*][^*]*\*+)*/';
           // Regexp to match double quoted strings.
           $double_quot = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"';
           // Regexp to match single quoted strings.
           $single_quot = "'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'";
           // Strip all comment blocks, but keep double/single quoted strings.
           $contents = preg_replace(
             "<($double_quot|$single_quot)|$comment>Ss",
             "$1",
             $contents
           );
           // Remove certain whitespace.
           // There are different conditions for removing leading and trailing
           // whitespace.
           // @see http://php.net/manual/regexp.reference.subpatterns.php
           $contents = preg_replace('<
             # Strip leading and trailing whitespace.
               \s*([@{};,])\s*
             # Strip only leading whitespace from:
             # - Closing parenthesis: Retain "@media (bar) and foo".
             | \s+([\)])
             # Strip only trailing whitespace from:
             # - Opening parenthesis: Retain "@media (bar) and foo".
             # - Colon: Retain :pseudo-selectors.
             | ([\(:])\s+
           >xS',
             // Only one of the three capturing groups will match, so its reference
             // will contain the wanted value and the references for the
             // two non-matching groups will be replaced with empty strings.
             '$1$2$3',
             $contents
           );
           // End the file with a new line.
           $contents = trim($contents);
           $contents .= "\n";
+        }
         // Replaces @import commands with the actual stylesheet content.
         // This happens recursively but omits external files.
         $contents = preg_replace_callback('/@import\s*(?:url\(\s*)?[\'"]?(?![a-z]+:)(?!\/\/)([^\'"\()]+)[\'"]?\s*\)?\s*;/', '_drupal_load_stylesheet', $contents);
         return $contents;
+      }
       /**
        * Loads stylesheets recursively and returns contents with corrected paths.
+       *
        * This function is used for recursive loading of stylesheets and
        * returns the stylesheet content with all url() paths corrected.
        */
       function _drupal_load_stylesheet($matches) {
         $filename = $matches[1];
         // Load the imported stylesheet and replace @import commands in there as well.
         $file = drupal_load_stylesheet($filename, NULL, FALSE);
         // Determine the file's directory.
         $directory = dirname($filename);
         // If the file is in the current directory, make sure '.' doesn't appear in
         // the url() path.
         $directory = $directory == '.' ? '' : $directory .'/';
         // Alter all internal url() paths. Leave external paths alone. We don't need
         // to normalize absolute paths here (i.e. remove folder/... segments) because
         // that will be done later.
         return preg_replace('/url\(\s*([\'"]?)(?![a-z]+:|\/+)([^\'")]+)([\'"]?)\s*\)/i', 'url(\1' . $directory . '\2\3)', $file);
+      }
       /**
        * Deletes old cached CSS files.
        */
       function drupal_clear_css_cache() {
         variable_del('drupal_css_cache_files');
         file_scan_directory('public://css', '/.*/', array('callback' => 'drupal_delete_file_if_stale'));
+      }
       /**
        * Callback to delete files modified more than a set time ago.
        */
       function drupal_delete_file_if_stale($uri) {
         // Default stale file threshold is 30 days.
         if (REQUEST_TIME - filemtime($uri) > variable_get('drupal_stale_file_threshold', 2592000)) {
           file_unmanaged_delete($uri);
+        }
+      }
       /**
        * Prepares a string for use as a CSS identifier (element, class, or ID name).
+       *
        * http://www.w3.org/TR/CSS21/syndata.html#characters shows the syntax for valid
        * CSS identifiers (including element names, classes, and IDs in selectors.)
+       *
        * @param $identifier
        *   The identifier to clean.
        * @param $filter
        *   An array of string replacements to use on the identifier.
+       *
        * @return
        *   The cleaned identifier.
        */
       function drupal_clean_css_identifier($identifier, $filter = array(' ' => '-', '_' => '-', '/' => '-', '[' => '-', ']' => '')) {
         // Use the advanced drupal_static() pattern, since this is called very often.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast)) {
           $drupal_static_fast['allow_css_double_underscores'] = &drupal_static(__FUNCTION__ . ':allow_css_double_underscores');
+        }
         $allow_css_double_underscores = &$drupal_static_fast['allow_css_double_underscores'];
         if (!isset($allow_css_double_underscores)) {
           $allow_css_double_underscores = variable_get('allow_css_double_underscores', FALSE);
+        }
         // Preserve BEM-style double-underscores depending on custom setting.
         if ($allow_css_double_underscores) {
           $filter['__'] = '__';
+        }
         // By default, we filter using Drupal's coding standards.
         $identifier = strtr($identifier, $filter);
         // Valid characters in a CSS identifier are:
         // - the hyphen (U+002D)
         // - a-z (U+0030 - U+0039)
         // - A-Z (U+0041 - U+005A)
         // - the underscore (U+005F)
         // - 0-9 (U+0061 - U+007A)
         // - ISO 10646 characters U+00A1 and higher
         // We strip out any character not in the above list.
         $identifier = preg_replace('/[^\x{002D}\x{0030}-\x{0039}\x{0041}-\x{005A}\x{005F}\x{0061}-\x{007A}\x{00A1}-\x{FFFF}]/u', '', $identifier);
         return $identifier;
+      }
       /**
        * Prepares a string for use as a valid class name.
+       *
        * Do not pass one string containing multiple classes as they will be
        * incorrectly concatenated with dashes, i.e. "one two" will become "one-two".
+       *
        * @param $class
        *   The class name to clean.
+       *
        * @return
        *   The cleaned class name.
        */
       function drupal_html_class($class) {
         // The output of this function will never change, so this uses a normal
         // static instead of drupal_static().
         static $classes = array();
         if (!isset($classes[$class])) {
           $classes[$class] = drupal_clean_css_identifier(drupal_strtolower($class));
+        }
         return $classes[$class];
+      }
       /**
        * Prepares a string for use as a valid HTML ID and guarantees uniqueness.
+       *
        * This function ensures that each passed HTML ID value only exists once on the
        * page. By tracking the already returned ids, this function enables forms,
        * blocks, and other content to be output multiple times on the same page,
        * without breaking (X)HTML validation.
+       *
        * For already existing IDs, a counter is appended to the ID string. Therefore,
        * JavaScript and CSS code should not rely on any value that was generated by
        * this function and instead should rely on manually added CSS classes or
        * similarly reliable constructs.
+       *
        * Two consecutive hyphens separate the counter from the original ID. To manage
        * uniqueness across multiple Ajax requests on the same page, Ajax requests
        * POST an array of all IDs currently present on the page, which are used to
        * prime this function's cache upon first invocation.
+       *
        * To allow reverse-parsing of IDs submitted via Ajax, any multiple consecutive
        * hyphens in the originally passed $id are replaced with a single hyphen.
+       *
        * @param $id
        *   The ID to clean.
+       *
        * @return
        *   The cleaned ID.
        */
       function drupal_html_id($id) {
         // If this is an Ajax request, then content returned by this page request will
         // be merged with content already on the base page. The HTML IDs must be
         // unique for the fully merged content. Therefore, initialize $seen_ids to
         // take into account IDs that are already in use on the base page.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast['seen_ids_init'])) {
           $drupal_static_fast['seen_ids_init'] = &drupal_static(__FUNCTION__ . ':init');
+        }
         $seen_ids_init = &$drupal_static_fast['seen_ids_init'];
         if (!isset($seen_ids_init)) {
           // Ideally, Drupal would provide an API to persist state information about
           // prior page requests in the database, and we'd be able to add this
           // function's $seen_ids static variable to that state information in order
           // to have it properly initialized for this page request. However, no such
           // page state API exists, so instead, ajax.js adds all of the in-use HTML
           // IDs to the POST data of Ajax submissions. Direct use of $_POST is
           // normally not recommended as it could open up security risks, but because
           // the raw POST data is cast to a number before being returned by this
           // function, this usage is safe.
           if (empty($_POST['ajax_html_ids'])) {
             $seen_ids_init = array();
+          }
           else {
             // This function ensures uniqueness by appending a counter to the base id
             // requested by the calling function after the first occurrence of that
             // requested id. $_POST['ajax_html_ids'] contains the ids as they were
             // returned by this function, potentially with the appended counter, so
             // we parse that to reconstruct the $seen_ids array.
             if (isset($_POST['ajax_html_ids'][0]) && strpos($_POST['ajax_html_ids'][0], ',') === FALSE) {
               $ajax_html_ids = $_POST['ajax_html_ids'];
+            }
             else {
               // jquery.form.js may send the server a comma-separated string as the
               // first element of an array (see http://drupal.org/node/1575060), so
               // we need to convert it to an array in that case.
               $ajax_html_ids = explode(',', $_POST['ajax_html_ids'][0]);
+            }
             foreach ($ajax_html_ids as $seen_id) {
               // We rely on '--' being used solely for separating a base id from the
               // counter, which this function ensures when returning an id.
               $parts = explode('--', $seen_id, 2);
               if (!empty($parts[1]) && is_numeric($parts[1])) {
                 list($seen_id, $i) = $parts;
+              }
               else {
                 $i = 1;
+              }
               if (!isset($seen_ids_init[$seen_id]) || ($i > $seen_ids_init[$seen_id])) {
                 $seen_ids_init[$seen_id] = $i;
+              }
+            }
+          }
+        }
         if (!isset($drupal_static_fast['seen_ids'])) {
           $drupal_static_fast['seen_ids'] = &drupal_static(__FUNCTION__, $seen_ids_init);
+        }
         $seen_ids = &$drupal_static_fast['seen_ids'];
         $id = strtr(drupal_strtolower($id), array(' ' => '-', '_' => '-', '[' => '-', ']' => ''));
         // As defined in http://www.w3.org/TR/html4/types.html#type-name, HTML IDs can
         // only contain letters, digits ([0-9]), hyphens ("-"), underscores ("_"),
         // colons (":"), and periods ("."). We strip out any character not in that
         // list. Note that the CSS spec doesn't allow colons or periods in identifiers
         // (http://www.w3.org/TR/CSS21/syndata.html#characters), so we strip those two
         // characters as well.
         $id = preg_replace('/[^A-Za-z0-9\-_]/', '', $id);
         // Removing multiple consecutive hyphens.
         $id = preg_replace('/\-+/', '-', $id);
         // Ensure IDs are unique by appending a counter after the first occurrence.
         // The counter needs to be appended with a delimiter that does not exist in
         // the base ID. Requiring a unique delimiter helps ensure that we really do
         // return unique IDs and also helps us re-create the $seen_ids array during
         // Ajax requests.
         if (isset($seen_ids[$id])) {
           $id = $id . '--' . ++$seen_ids[$id];
+        }
         else {
           $seen_ids[$id] = 1;
+        }
         return $id;
+      }
       /**
        * Provides a standard HTML class name that identifies a page region.
+       *
        * It is recommended that template preprocess functions apply this class to any
        * page region that is output by the theme (Drupal core already handles this in
        * the standard template preprocess implementation). Standardizing the class
        * names in this way allows modules to implement certain features, such as
        * drag-and-drop or dynamic Ajax loading, in a theme-independent way.
+       *
        * @param $region
        *   The name of the page region (for example, 'page_top' or 'content').
+       *
        * @return
        *   An HTML class that identifies the region (for example, 'region-page-top'
        *   or 'region-content').
+       *
        * @see template_preprocess_region()
        */
       function drupal_region_class($region) {
         return drupal_html_class("region-$region");
+      }
       /**
        * Adds a JavaScript file, setting, or inline code to the page.
+       *
        * The behavior of this function depends on the parameters it is called with.
        * Generally, it handles the addition of JavaScript to the page, either as
        * reference to an existing file or as inline code. The following actions can be
        * performed using this function:
        * - Add a file ('file'): Adds a reference to a JavaScript file to the page.
        * - Add inline JavaScript code ('inline'): Executes a piece of JavaScript code
        *   on the current page by placing the code directly in the page (for example,
        *   to tell the user that a new message arrived, by opening a pop up, alert
        *   box, etc.). This should only be used for JavaScript that cannot be executed
        *   from a file. When adding inline code, make sure that you are not relying on
        *   $() being the jQuery function. Wrap your code in
        *   @code (function ($) {... })(jQuery); @endcode
        *   or use jQuery() instead of $().
        * - Add external JavaScript ('external'): Allows the inclusion of external
        *   JavaScript files that are not hosted on the local server. Note that these
        *   external JavaScript references do not get aggregated when preprocessing is
        *   on.
        * - Add settings ('setting'): Adds settings to Drupal's global storage of
        *   JavaScript settings. Per-page settings are required by some modules to
        *   function properly. All settings will be accessible at Drupal.settings.
+       *
        * Examples:
        * @code
        *   drupal_add_js('misc/collapse.js');
        *   drupal_add_js('misc/collapse.js', 'file');
        *   drupal_add_js('jQuery(document).ready(function () { alert("Hello!"); });', 'inline');
        *   drupal_add_js('jQuery(document).ready(function () { alert("Hello!"); });',
        *     array('type' => 'inline', 'scope' => 'footer', 'weight' => 5)
        *   );
        *   drupal_add_js('http://example.com/example.js', 'external');
        *   drupal_add_js(array('myModule' => array('key' => 'value')), 'setting');
        * @endcode
+       *
        * Calling drupal_static_reset('drupal_add_js') will clear all JavaScript added
        * so far.
+       *
        * If JavaScript aggregation is enabled, all JavaScript files added with
        * $options['preprocess'] set to TRUE will be merged into one aggregate file.
        * Preprocessed inline JavaScript will not be aggregated into this single file.
        * Externally hosted JavaScripts are never aggregated.
+       *
        * The reason for aggregating the files is outlined quite thoroughly here:
        * http://www.die.net/musings/page_load_time/ "Load fewer external objects. Due
        * to request overhead, one bigger file just loads faster than two smaller ones
        * half its size."
+       *
        * $options['preprocess'] should be only set to TRUE when a file is required for
        * all typical visitors and most pages of a site. It is critical that all
        * preprocessed files are added unconditionally on every page, even if the
        * files are not needed on a page. This is normally done by calling
        * drupal_add_js() in a hook_init() implementation.
+       *
        * Non-preprocessed files should only be added to the page when they are
        * actually needed.
+       *
        * @param $data
        *   (optional) If given, the value depends on the $options parameter, or
        *   $options['type'] if $options is passed as an associative array:
        *   - 'file': Path to the file relative to base_path().
        *   - 'inline': The JavaScript code that should be placed in the given scope.
        *   - 'external': The absolute path to an external JavaScript file that is not
        *     hosted on the local server. These files will not be aggregated if
        *     JavaScript aggregation is enabled.
        *   - 'setting': An associative array with configuration options. The array is
        *     merged directly into Drupal.settings. All modules should wrap their
        *     actual configuration settings in another variable to prevent conflicts in
        *     the Drupal.settings namespace. Items added with a string key will replace
        *     existing settings with that key; items with numeric array keys will be
        *     added to the existing settings array.
        * @param $options
        *   (optional) A string defining the type of JavaScript that is being added in
        *   the $data parameter ('file'/'setting'/'inline'/'external'), or an
        *   associative array. JavaScript settings should always pass the string
        *   'setting' only. Other types can have the following elements in the array:
        *   - type: The type of JavaScript that is to be added to the page. Allowed
        *     values are 'file', 'inline', 'external' or 'setting'. Defaults
        *     to 'file'.
        *   - scope: The location in which you want to place the script. Possible
        *     values are 'header' or 'footer'. If your theme implements different
        *     regions, you can also use these. Defaults to 'header'.
        *   - group: A number identifying the group in which to add the JavaScript.
        *     Available constants are:
        *     - JS_LIBRARY: Any libraries, settings, or jQuery plugins.
        *     - JS_DEFAULT: Any module-layer JavaScript.
        *     - JS_THEME: Any theme-layer JavaScript.
        *     The group number serves as a weight: JavaScript within a lower weight
        *     group is presented on the page before JavaScript within a higher weight
        *     group.
        *   - every_page: For optimal front-end performance when aggregation is
        *     enabled, this should be set to TRUE if the JavaScript is present on every
        *     page of the website for users for whom it is present at all. This
        *     defaults to FALSE. It is set to TRUE for JavaScript files that are added
        *     via module and theme .info files. Modules that add JavaScript within
        *     hook_init() implementations, or from other code that ensures that the
        *     JavaScript is added to all website pages, should also set this flag to
        *     TRUE. All JavaScript files within the same group and that have the
        *     'every_page' flag set to TRUE and do not have 'preprocess' set to FALSE
        *     are aggregated together into a single aggregate file, and that aggregate
        *     file can be reused across a user's entire site visit, leading to faster
        *     navigation between pages. However, JavaScript that is only needed on
        *     pages less frequently visited, can be added by code that only runs for
        *     those particular pages, and that code should not set the 'every_page'
        *     flag. This minimizes the size of the aggregate file that the user needs
        *     to download when first visiting the website. JavaScript without the
        *     'every_page' flag is aggregated into a separate aggregate file. This
        *     other aggregate file is likely to change from page to page, and each new
        *     aggregate file needs to be downloaded when first encountered, so it
        *     should be kept relatively small by ensuring that most commonly needed
        *     JavaScript is added to every page.
        *   - weight: A number defining the order in which the JavaScript is added to
        *     the page relative to other JavaScript with the same 'scope', 'group',
        *     and 'every_page' value. In some cases, the order in which the JavaScript
        *     is presented on the page is very important. jQuery, for example, must be
        *     added to the page before any jQuery code is run, so jquery.js uses the
        *     JS_LIBRARY group and a weight of -20, jquery.once.js (a library drupal.js
        *     depends on) uses the JS_LIBRARY group and a weight of -19, drupal.js uses
        *     the JS_LIBRARY group and a weight of -1, other libraries use the
        *     JS_LIBRARY group and a weight of 0 or higher, and all other scripts use
        *     one of the other group constants. The exact ordering of JavaScript is as
        *     follows:
        *     - First by scope, with 'header' first, 'footer' last, and any other
        *       scopes provided by a custom theme coming in between, as determined by
        *       the theme.
        *     - Then by group.
        *     - Then by the 'every_page' flag, with TRUE coming before FALSE.
        *     - Then by weight.
        *     - Then by the order in which the JavaScript was added. For example, all
        *       else being the same, JavaScript added by a call to drupal_add_js() that
        *       happened later in the page request gets added to the page after one for
        *       which drupal_add_js() happened earlier in the page request.
        *   - requires_jquery: Set this to FALSE if the JavaScript you are adding does
        *     not have a dependency on jQuery. Defaults to TRUE, except for JavaScript
        *     settings where it defaults to FALSE. This is used on sites that have the
        *     'javascript_always_use_jquery' variable set to FALSE; on those sites, if
        *     all the JavaScript added to the page by drupal_add_js() does not have a
        *     dependency on jQuery, then for improved front-end performance Drupal
        *     will not add jQuery and related libraries and settings to the page.
        *   - defer: If set to TRUE, the defer attribute is set on the <script>
        *     tag. Defaults to FALSE.
        *   - cache: If set to FALSE, the JavaScript file is loaded anew on every page
        *     call; in other words, it is not cached. Used only when 'type' references
        *     a JavaScript file. Defaults to TRUE.
        *   - preprocess: If TRUE and JavaScript aggregation is enabled, the script
        *     file will be aggregated. Defaults to TRUE.
+       *
        * @return
        *   The current array of JavaScript files, settings, and in-line code,
        *   including Drupal defaults, anything previously added with calls to
        *   drupal_add_js(), and this function call's additions.
+       *
        * @see drupal_get_js()
        */
       function drupal_add_js($data = NULL, $options = NULL) {
         $javascript = &drupal_static(__FUNCTION__, array());
         $jquery_added = &drupal_static(__FUNCTION__ . ':jquery_added', FALSE);
         // If the $javascript variable has been reset with drupal_static_reset(),
         // jQuery and related files will have been removed from the list, so set the
         // variable back to FALSE to indicate they have not yet been added.
         if (empty($javascript)) {
           $jquery_added = FALSE;
+        }
         // Construct the options, taking the defaults into consideration.
         if (isset($options)) {
           if (!is_array($options)) {
             $options = array('type' => $options);
+          }
+        }
         else {
           $options = array();
+        }
         if (isset($options['type']) && $options['type'] == 'setting') {
           $options += array('requires_jquery' => FALSE);
+        }
         $options += drupal_js_defaults($data);
         // Preprocess can only be set if caching is enabled.
         $options['preprocess'] = $options['cache'] ? $options['preprocess'] : FALSE;
         // Tweak the weight so that files of the same weight are included in the
         // order of the calls to drupal_add_js().
         $options['weight'] += count($javascript) / 1000;
         if (isset($data)) {
           // Add jquery.js, drupal.js, and related files and settings if they have
           // not been added yet. However, if the 'javascript_always_use_jquery'
           // variable is set to FALSE (indicating that the site does not want jQuery
           // automatically added on all pages) then only add it if a file or setting
           // that requires jQuery is being added also.
           if (!$jquery_added && (variable_get('javascript_always_use_jquery', TRUE) || $options['requires_jquery'])) {
             $jquery_added = TRUE;
             // url() generates the prefix using hook_url_outbound_alter(). Instead of
             // running the hook_url_outbound_alter() again here, extract the prefix
             // from url().
             url('', array('prefix' => &$prefix));
             $default_javascript = array(
               'settings' => array(
                 'data' => array(
                   array('basePath' => base_path()),
                   array('pathPrefix' => empty($prefix) ? '' : $prefix),
                 ),
                 'type' => 'setting',
                 'scope' => 'header',
                 'group' => JS_LIBRARY,
                 'every_page' => TRUE,
                 'weight' => 0,
               ),
               'misc/drupal.js' => array(
                 'data' => 'misc/drupal.js',
                 'type' => 'file',
                 'scope' => 'header',
                 'group' => JS_LIBRARY,
                 'every_page' => TRUE,
                 'weight' => -1,
                 'requires_jquery' => TRUE,
                 'preprocess' => TRUE,
                 'cache' => TRUE,
                 'defer' => FALSE,
               ),
             );
             $javascript = drupal_array_merge_deep($javascript, $default_javascript);
             // Register all required libraries.
             drupal_add_library('system', 'jquery', TRUE);
             drupal_add_library('system', 'jquery.once', TRUE);
+          }
           switch ($options['type']) {
             case 'setting':
               // All JavaScript settings are placed in the header of the page with
               // the library weight so that inline scripts appear afterwards.
               $javascript['settings']['data'][] = $data;
               break;
             case 'inline':
               $javascript[] = $options;
               break;
             default: // 'file' and 'external'
               // Local and external files must keep their name as the associative key
               // so the same JavaScript file is not added twice.
               $javascript[$options['data']] = $options;
+          }
+        }
         return $javascript;
+      }
       /**
        * Constructs an array of the defaults that are used for JavaScript items.
+       *
        * @param $data
        *   (optional) The default data parameter for the JavaScript item array.
+       *
        * @see drupal_get_js()
        * @see drupal_add_js()
        */
       function drupal_js_defaults($data = NULL) {
         return array(
           'type' => 'file',
           'group' => JS_DEFAULT,
           'every_page' => FALSE,
           'weight' => 0,
           'requires_jquery' => TRUE,
           'scope' => 'header',
           'cache' => TRUE,
           'defer' => FALSE,
           'preprocess' => TRUE,
           'version' => NULL,
           'data' => $data,
         );
+      }
       /**
        * Returns a themed presentation of all JavaScript code for the current page.
+       *
        * References to JavaScript files are placed in a certain order: first, all
        * 'core' files, then all 'module' and finally all 'theme' JavaScript files
        * are added to the page. Then, all settings are output, followed by 'inline'
        * JavaScript code. If running update.php, all preprocessing is disabled.
+       *
        * Note that hook_js_alter(&$javascript) is called during this function call
        * to allow alterations of the JavaScript during its presentation. Calls to
        * drupal_add_js() from hook_js_alter() will not be added to the output
        * presentation. The correct way to add JavaScript during hook_js_alter()
        * is to add another element to the $javascript array, deriving from
        * drupal_js_defaults(). See locale_js_alter() for an example of this.
+       *
        * @param $scope
        *   (optional) The scope for which the JavaScript rules should be returned.
        *   Defaults to 'header'.
        * @param $javascript
        *   (optional) An array with all JavaScript code. Defaults to the default
        *   JavaScript array for the given scope.
        * @param $skip_alter
        *   (optional) If set to TRUE, this function skips calling drupal_alter() on
        *   $javascript, useful when the calling function passes a $javascript array
        *   that has already been altered.
+       *
        * @return
        *   All JavaScript code segments and includes for the scope as HTML tags.
+       *
        * @see drupal_add_js()
        * @see locale_js_alter()
        * @see drupal_js_defaults()
        */
       function drupal_get_js($scope = 'header', $javascript = NULL, $skip_alter = FALSE) {
         if (!isset($javascript)) {
           $javascript = drupal_add_js();
+        }
         // If no JavaScript items have been added, or if the only JavaScript items
         // that have been added are JavaScript settings (which don't do anything
         // without any JavaScript code to use them), then no JavaScript code should
         // be added to the page.
         if (empty($javascript) || (isset($javascript['settings']) && count($javascript) == 1)) {
           return '';
+        }
         // Allow modules to alter the JavaScript.
         if (!$skip_alter) {
           drupal_alter('js', $javascript);
+        }
         // Filter out elements of the given scope.
         $items = array();
         foreach ($javascript as $key => $item) {
           if ($item['scope'] == $scope) {
             $items[$key] = $item;
+          }
+        }
         $output = '';
         // The index counter is used to keep aggregated and non-aggregated files in
         // order by weight.
         $index = 1;
         $processed = array();
         $files = array();
         $preprocess_js = (variable_get('preprocess_js', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
         // A dummy query-string is added to filenames, to gain control over
         // browser-caching. The string changes on every update or full cache
         // flush, forcing browsers to load a new copy of the files, as the
         // URL changed. Files that should not be cached (see drupal_add_js())
         // get REQUEST_TIME as query-string instead, to enforce reload on every
         // page request.
         $default_query_string = variable_get('css_js_query_string', '0');
         // For inline JavaScript to validate as XHTML, all JavaScript containing
         // XHTML needs to be wrapped in CDATA. To make that backwards compatible
         // with HTML 4, we need to comment out the CDATA-tag.
         $embed_prefix = "\n<!--//--><![CDATA[//><!--\n";
         $embed_suffix = "\n//--><!]]>\n";
         // Since JavaScript may look for arguments in the URL and act on them, some
         // third-party code might require the use of a different query string.
         $js_version_string = variable_get('drupal_js_version_query_string', 'v=');
         // Sort the JavaScript so that it appears in the correct order.
         uasort($items, 'drupal_sort_css_js');
         // Provide the page with information about the individual JavaScript files
         // used, information not otherwise available when aggregation is enabled.
         $setting['ajaxPageState']['js'] = array_fill_keys(array_keys($items), 1);
         unset($setting['ajaxPageState']['js']['settings']);
         drupal_add_js($setting, 'setting');
         // If we're outputting the header scope, then this might be the final time
         // that drupal_get_js() is running, so add the setting to this output as well
         // as to the drupal_add_js() cache. If $items['settings'] doesn't exist, it's
         // because drupal_get_js() was intentionally passed a $javascript argument
         // stripped off settings, potentially in order to override how settings get
         // output, so in this case, do not add the setting to this output.
         if ($scope == 'header' && isset($items['settings'])) {
           $items['settings']['data'][] = $setting;
+        }
         // Loop through the JavaScript to construct the rendered output.
         $element = array(
           '#tag' => 'script',
           '#value' => '',
           '#attributes' => array(
             'type' => 'text/javascript',
           ),
         );
         foreach ($items as $item) {
           $query_string =  empty($item['version']) ? $default_query_string : $js_version_string . $item['version'];
           switch ($item['type']) {
             case 'setting':
               $js_element = $element;
               $js_element['#value_prefix'] = $embed_prefix;
               $js_element['#value'] = 'jQuery.extend(Drupal.settings, ' . drupal_json_encode(drupal_array_merge_deep_array($item['data'])) . ");";
               $js_element['#value_suffix'] = $embed_suffix;
               $output .= theme('html_tag', array('element' => $js_element));
               break;
             case 'inline':
               $js_element = $element;
               if ($item['defer']) {
                 $js_element['#attributes']['defer'] = 'defer';
+              }
               $js_element['#value_prefix'] = $embed_prefix;
               $js_element['#value'] = $item['data'];
               $js_element['#value_suffix'] = $embed_suffix;
               $processed[$index++] = theme('html_tag', array('element' => $js_element));
               break;
             case 'file':
               $js_element = $element;
               if (!$item['preprocess'] || !$preprocess_js) {
                 if ($item['defer']) {
                   $js_element['#attributes']['defer'] = 'defer';
+                }
                 $query_string_separator = (strpos($item['data'], '?') !== FALSE) ? '&' : '?';
                 $js_element['#attributes']['src'] = file_create_url($item['data']) . $query_string_separator . ($item['cache'] ? $query_string : REQUEST_TIME);
                 $processed[$index++] = theme('html_tag', array('element' => $js_element));
+              }
               else {
                 // By increasing the index for each aggregated file, we maintain
                 // the relative ordering of JS by weight. We also set the key such
                 // that groups are split by items sharing the same 'group' value and
                 // 'every_page' flag. While this potentially results in more aggregate
                 // files, it helps make each one more reusable across a site visit,
                 // leading to better front-end performance of a website as a whole.
                 // See drupal_add_js() for details.
                 $key = 'aggregate_' . $item['group'] . '_' . $item['every_page'] . '_' . $index;
                 $processed[$key] = '';
                 $files[$key][$item['data']] = $item;
+              }
               break;
             case 'external':
               $js_element = $element;
               // Preprocessing for external JavaScript files is ignored.
               if ($item['defer']) {
                 $js_element['#attributes']['defer'] = 'defer';
+              }
               $js_element['#attributes']['src'] = $item['data'];
               $processed[$index++] = theme('html_tag', array('element' => $js_element));
               break;
+          }
+        }
         // Aggregate any remaining JS files that haven't already been output.
         if ($preprocess_js && count($files) > 0) {
           foreach ($files as $key => $file_set) {
             $uri = drupal_build_js_cache($file_set);
             // Only include the file if was written successfully. Errors are logged
             // using watchdog.
             if ($uri) {
               $preprocess_file = file_create_url($uri);
               $js_element = $element;
               $js_element['#attributes']['src'] = $preprocess_file;
               $processed[$key] = theme('html_tag', array('element' => $js_element));
+            }
+          }
+        }
         // Keep the order of JS files consistent as some are preprocessed and others are not.
         // Make sure any inline or JS setting variables appear last after libraries have loaded.
         return implode('', $processed) . $output;
+      }
       /**
        * Adds attachments to a render() structure.
+       *
        * Libraries, JavaScript, CSS and other types of custom structures are attached
        * to elements using the #attached property. The #attached property is an
        * associative array, where the keys are the attachment types and the values are
        * the attached data. For example:
        * @code
        * $build['#attached'] = array(
        *   'js' => array(drupal_get_path('module', 'taxonomy') . '/taxonomy.js'),
        *   'css' => array(drupal_get_path('module', 'taxonomy') . '/taxonomy.css'),
        * );
        * @endcode
+       *
        * 'js', 'css', and 'library' are types that get special handling. For any
        * other kind of attached data, the array key must be the full name of the
        * callback function and each value an array of arguments. For example:
        * @code
        * $build['#attached']['drupal_add_http_header'] = array(
        *   array('Content-Type', 'application/rss+xml; charset=utf-8'),
        * );
        * @endcode
+       *
        * External 'js' and 'css' files can also be loaded. For example:
        * @code
        * $build['#attached']['js'] = array(
        *   'http://code.jquery.com/jquery-1.4.2.min.js' => array(
        *     'type' => 'external',
        *   ),
        * );
        * @endcode
+       *
        * @param $elements
        *   The structured array describing the data being rendered.
        * @param $group
        *   The default group of JavaScript and CSS being added. This is only applied
        *   to the stylesheets and JavaScript items that don't have an explicit group
        *   assigned to them.
        * @param $dependency_check
        *   When TRUE, will exit if a given library's dependencies are missing. When
        *   set to FALSE, will continue to add the libraries, even though one or more
        *   dependencies are missing. Defaults to FALSE.
        * @param $every_page
        *   Set to TRUE to indicate that the attachments are added to every page on the
        *   site. Only attachments with the every_page flag set to TRUE can participate
        *   in JavaScript/CSS aggregation.
+       *
        * @return
        *   FALSE if there were any missing library dependencies; TRUE if all library
        *   dependencies were met.
+       *
        * @see drupal_add_library()
        * @see drupal_add_js()
        * @see drupal_add_css()
        * @see drupal_render()
        */
       function drupal_process_attached($elements, $group = JS_DEFAULT, $dependency_check = FALSE, $every_page = NULL) {
         // Add defaults to the special attached structures that should be processed differently.
         $elements['#attached'] += array(
           'library' => array(),
           'js' => array(),
           'css' => array(),
         );
         // Add the libraries first.
         $success = TRUE;
         foreach ($elements['#attached']['library'] as $library) {
           if (drupal_add_library($library[0], $library[1], $every_page) === FALSE) {
             $success = FALSE;
             // Exit if the dependency is missing.
             if ($dependency_check) {
               return $success;
+            }
+          }
+        }
         unset($elements['#attached']['library']);
         // Add both the JavaScript and the CSS.
         // The parameters for drupal_add_js() and drupal_add_css() require special
         // handling.
         foreach (array('js', 'css') as $type) {
           foreach ($elements['#attached'][$type] as $data => $options) {
             // If the value is not an array, it's a filename and passed as first
             // (and only) argument.
             if (!is_array($options)) {
               $data = $options;
               $options = NULL;
+            }
             // In some cases, the first parameter ($data) is an array. Arrays can't be
             // passed as keys in PHP, so we have to get $data from the value array.
             if (is_numeric($data)) {
               $data = $options['data'];
               unset($options['data']);
+            }
             // Apply the default group if it isn't explicitly given.
             if (!isset($options['group'])) {
               $options['group'] = $group;
+            }
             // Set the every_page flag if one was passed.
             if (isset($every_page)) {
               $options['every_page'] = $every_page;
+            }
             call_user_func('drupal_add_' . $type, $data, $options);
+          }
           unset($elements['#attached'][$type]);
+        }
         // Add additional types of attachments specified in the render() structure.
         // Libraries, JavaScript and CSS have been added already, as they require
         // special handling.
         foreach ($elements['#attached'] as $callback => $options) {
           if (function_exists($callback)) {
             foreach ($elements['#attached'][$callback] as $args) {
               call_user_func_array($callback, $args);
+            }
+          }
+        }
         return $success;
+      }
       /**
        * Adds JavaScript to change the state of an element based on another element.
+       *
        * A "state" means a certain property on a DOM element, such as "visible" or
        * "checked". A state can be applied to an element, depending on the state of
        * another element on the page. In general, states depend on HTML attributes and
        * DOM element properties, which change due to user interaction.
+       *
        * Since states are driven by JavaScript only, it is important to understand
        * that all states are applied on presentation only, none of the states force
        * any server-side logic, and that they will not be applied for site visitors
        * without JavaScript support. All modules implementing states have to make
        * sure that the intended logic also works without JavaScript being enabled.
+       *
        * #states is an associative array in the form of:
        * @code
        * array(
        *   STATE1 => CONDITIONS_ARRAY1,
        *   STATE2 => CONDITIONS_ARRAY2,
        *   ...
        * )
        * @endcode
        * Each key is the name of a state to apply to the element, such as 'visible'.
        * Each value is a list of conditions that denote when the state should be
        * applied.
+       *
        * Multiple different states may be specified to act on complex conditions:
        * @code
        * array(
        *   'visible' => CONDITIONS,
        *   'checked' => OTHER_CONDITIONS,
        * )
        * @endcode
+       *
        * Every condition is a key/value pair, whose key is a jQuery selector that
        * denotes another element on the page, and whose value is an array of
        * conditions, which must bet met on that element:
        * @code
        * array(
        *   'visible' => array(
        *     JQUERY_SELECTOR => REMOTE_CONDITIONS,
        *     JQUERY_SELECTOR => REMOTE_CONDITIONS,
        *     ...
        *   ),
        * )
        * @endcode
        * All conditions must be met for the state to be applied.
+       *
        * Each remote condition is a key/value pair specifying conditions on the other
        * element that need to be met to apply the state to the element:
        * @code
        * array(
        *   'visible' => array(
        *     ':input[name="remote_checkbox"]' => array('checked' => TRUE),
        *   ),
        * )
        * @endcode
+       *
        * For example, to show a textfield only when a checkbox is checked:
        * @code
        * $form['toggle_me'] = array(
        *   '#type' => 'checkbox',
        *   '#title' => t('Tick this box to type'),
        * );
        * $form['settings'] = array(
        *   '#type' => 'textfield',
        *   '#states' => array(
        *     // Only show this field when the 'toggle_me' checkbox is enabled.
        *     'visible' => array(
        *       ':input[name="toggle_me"]' => array('checked' => TRUE),
        *     ),
        *   ),
        * );
        * @endcode
+       *
        * The following states may be applied to an element:
        * - enabled
        * - disabled
        * - required
        * - optional
        * - visible
        * - invisible
        * - checked
        * - unchecked
        * - expanded
        * - collapsed
+       *
        * The following states may be used in remote conditions:
        * - empty
        * - filled
        * - checked
        * - unchecked
        * - expanded
        * - collapsed
        * - value
+       *
        * The following states exist for both elements and remote conditions, but are
        * not fully implemented and may not change anything on the element:
        * - relevant
        * - irrelevant
        * - valid
        * - invalid
        * - touched
        * - untouched
        * - readwrite
        * - readonly
+       *
        * When referencing select lists and radio buttons in remote conditions, a
        * 'value' condition must be used:
        * @code
        *   '#states' => array(
        *     // Show the settings if 'bar' has been selected for 'foo'.
        *     'visible' => array(
        *       ':input[name="foo"]' => array('value' => 'bar'),
        *     ),
        *   ),
        * @endcode
+       *
        * @param $elements
        *   A renderable array element having a #states property as described above.
+       *
        * @see form_example_states_form()
        */
       function drupal_process_states(&$elements) {
         $elements['#attached']['library'][] = array('system', 'drupal.states');
         $elements['#attached']['js'][] = array(
           'type' => 'setting',
           'data' => array('states' => array('#' . $elements['#id'] => $elements['#states'])),
         );
+      }
       /**
        * Adds multiple JavaScript or CSS files at the same time.
+       *
        * A library defines a set of JavaScript and/or CSS files, optionally using
        * settings, and optionally requiring another library. For example, a library
        * can be a jQuery plugin, a JavaScript framework, or a CSS framework. This
        * function allows modules to load a library defined/shipped by itself or a
        * depending module, without having to add all files of the library separately.
        * Each library is only loaded once.
+       *
        * @param $module
        *   The name of the module that registered the library.
        * @param $name
        *   The name of the library to add.
        * @param $every_page
        *   Set to TRUE if this library is added to every page on the site. Only items
        *   with the every_page flag set to TRUE can participate in aggregation.
+       *
        * @return
        *   TRUE if the library was successfully added; FALSE if the library or one of
        *   its dependencies could not be added.
+       *
        * @see drupal_get_library()
        * @see hook_library()
        * @see hook_library_alter()
        */
       function drupal_add_library($module, $name, $every_page = NULL) {
         $added = &drupal_static(__FUNCTION__, array());
         // Only process the library if it exists and it was not added already.
         if (!isset($added[$module][$name])) {
           if ($library = drupal_get_library($module, $name)) {
             // Add all components within the library.
             $elements['#attached'] = array(
               'library' => $library['dependencies'],
               'js' => $library['js'],
               'css' => $library['css'],
             );
             $added[$module][$name] = drupal_process_attached($elements, JS_LIBRARY, TRUE, $every_page);
+          }
           else {
             // Requested library does not exist.
             $added[$module][$name] = FALSE;
+          }
+        }
         return $added[$module][$name];
+      }
       /**
        * Retrieves information for a JavaScript/CSS library.
+       *
        * Library information is statically cached. Libraries are keyed by module for
        * several reasons:
        * - Libraries are not unique. Multiple modules might ship with the same library
        *   in a different version or variant. This registry cannot (and does not
        *   attempt to) prevent library conflicts.
        * - Modules implementing and thereby depending on a library that is registered
        *   by another module can only rely on that module's library.
        * - Two (or more) modules can still register the same library and use it
        *   without conflicts in case the libraries are loaded on certain pages only.
+       *
        * @param $module
        *   The name of a module that registered a library.
        * @param $name
        *   (optional) The name of a registered library to retrieve. By default, all
        *   libraries registered by $module are returned.
+       *
        * @return
        *   The definition of the requested library, if $name was passed and it exists,
        *   or FALSE if it does not exist. If no $name was passed, an associative array
        *   of libraries registered by $module is returned (which may be empty).
+       *
        * @see drupal_add_library()
        * @see hook_library()
        * @see hook_library_alter()
+       *
        * @todo The purpose of drupal_get_*() is completely different to other page
        *   requisite API functions; find and use a different name.
        */
       function drupal_get_library($module, $name = NULL) {
         $libraries = &drupal_static(__FUNCTION__, array());
         if (!isset($libraries[$module])) {
           // Retrieve all libraries associated with the module.
           $module_libraries = module_invoke($module, 'library');
           if (empty($module_libraries)) {
             $module_libraries = array();
+          }
           // Allow modules to alter the module's registered libraries.
           drupal_alter('library', $module_libraries, $module);
           foreach ($module_libraries as $key => $data) {
             if (is_array($data)) {
               // Add default elements to allow for easier processing.
               $module_libraries[$key] += array('dependencies' => array(), 'js' => array(), 'css' => array());
               foreach ($module_libraries[$key]['js'] as $file => $options) {
                 $module_libraries[$key]['js'][$file]['version'] = $module_libraries[$key]['version'];
+              }
+            }
+          }
           $libraries[$module] = $module_libraries;
+        }
         if (isset($name)) {
           if (!isset($libraries[$module][$name])) {
             $libraries[$module][$name] = FALSE;
+          }
           return $libraries[$module][$name];
+        }
         return $libraries[$module];
+      }
       /**
        * Assists in adding the tableDrag JavaScript behavior to a themed table.
+       *
        * Draggable tables should be used wherever an outline or list of sortable items
        * needs to be arranged by an end-user. Draggable tables are very flexible and
        * can manipulate the value of form elements placed within individual columns.
+       *
        * To set up a table to use drag and drop in place of weight select-lists or in
        * place of a form that contains parent relationships, the form must be themed
        * into a table. The table must have an ID attribute set. If using
        * theme_table(), the ID may be set as follows:
        * @code
        * $output = theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => 'my-module-table')));
        * return $output;
        * @endcode
+       *
        * In the theme function for the form, a special class must be added to each
        * form element within the same column, "grouping" them together.
+       *
        * In a situation where a single weight column is being sorted in the table, the
        * classes could be added like this (in the theme function):
        * @code
        * $form['my_elements'][$delta]['weight']['#attributes']['class'] = array('my-elements-weight');
        * @endcode
+       *
        * Each row of the table must also have a class of "draggable" in order to
        * enable the drag handles:
        * @code
        * $row = array(...);
        * $rows[] = array(
        *   'data' => $row,
        *   'class' => array('draggable'),
        * );
        * @endcode
+       *
        * When tree relationships are present, the two additional classes
        * 'tabledrag-leaf' and 'tabledrag-root' can be used to refine the behavior:
        * - Rows with the 'tabledrag-leaf' class cannot have child rows.
        * - Rows with the 'tabledrag-root' class cannot be nested under a parent row.
+       *
        * Calling drupal_add_tabledrag() would then be written as such:
        * @code
        * drupal_add_tabledrag('my-module-table', 'order', 'sibling', 'my-elements-weight');
        * @endcode
+       *
        * In a more complex case where there are several groups in one column (such as
        * the block regions on the admin/structure/block page), a separate subgroup
        * class must also be added to differentiate the groups.
        * @code
        * $form['my_elements'][$region][$delta]['weight']['#attributes']['class'] = array('my-elements-weight', 'my-elements-weight-' . $region);
        * @endcode
+       *
        * $group is still 'my-element-weight', and the additional $subgroup variable
        * will be passed in as 'my-elements-weight-' . $region. This also means that
        * you'll need to call drupal_add_tabledrag() once for every region added.
+       *
        * @code
        * foreach ($regions as $region) {
        *   drupal_add_tabledrag('my-module-table', 'order', 'sibling', 'my-elements-weight', 'my-elements-weight-' . $region);
        * }
        * @endcode
+       *
        * In a situation where tree relationships are present, adding multiple
        * subgroups is not necessary, because the table will contain indentations that
        * provide enough information about the sibling and parent relationships. See
        * theme_menu_overview_form() for an example creating a table containing parent
        * relationships.
+       *
        * Note that this function should be called from the theme layer, such as in a
        * .tpl.php file, theme_ function, or in a template_preprocess function, not in
        * a form declaration. Though the same JavaScript could be added to the page
        * using drupal_add_js() directly, this function helps keep template files
        * clean and readable. It also prevents tabledrag.js from being added twice
        * accidentally.
+       *
        * @param $table_id
        *   String containing the target table's id attribute. If the table does not
        *   have an id, one will need to be set, such as <table id="my-module-table">.
        * @param $action
        *   String describing the action to be done on the form item. Either 'match'
        *   'depth', or 'order'. Match is typically used for parent relationships.
        *   Order is typically used to set weights on other form elements with the same
        *   group. Depth updates the target element with the current indentation.
        * @param $relationship
        *   String describing where the $action variable should be performed. Either
        *   'parent', 'sibling', 'group', or 'self'. Parent will only look for fields
        *   up the tree. Sibling will look for fields in the same group in rows above
        *   and below it. Self affects the dragged row itself. Group affects the
        *   dragged row, plus any children below it (the entire dragged group).
        * @param $group
        *   A class name applied on all related form elements for this action.
        * @param $subgroup
        *   (optional) If the group has several subgroups within it, this string should
        *   contain the class name identifying fields in the same subgroup.
        * @param $source
        *   (optional) If the $action is 'match', this string should contain the class
        *   name identifying what field will be used as the source value when matching
        *   the value in $subgroup.
        * @param $hidden
        *   (optional) The column containing the field elements may be entirely hidden
        *   from view dynamically when the JavaScript is loaded. Set to FALSE if the
        *   column should not be hidden.
        * @param $limit
        *   (optional) Limit the maximum amount of parenting in this table.
        * @see block-admin-display-form.tpl.php
        * @see theme_menu_overview_form()
        */
       function drupal_add_tabledrag($table_id, $action, $relationship, $group, $subgroup = NULL, $source = NULL, $hidden = TRUE, $limit = 0) {
         $js_added = &drupal_static(__FUNCTION__, FALSE);
         if (!$js_added) {
           // Add the table drag JavaScript to the page before the module JavaScript
           // to ensure that table drag behaviors are registered before any module
           // uses it.
           drupal_add_library('system', 'jquery.cookie');
           drupal_add_js('misc/tabledrag.js', array('weight' => -1));
           $js_added = TRUE;
+        }
         // If a subgroup or source isn't set, assume it is the same as the group.
         $target = isset($subgroup) ? $subgroup : $group;
         $source = isset($source) ? $source : $target;
         $settings['tableDrag'][$table_id][$group][] = array(
           'target' => $target,
           'source' => $source,
           'relationship' => $relationship,
           'action' => $action,
           'hidden' => $hidden,
           'limit' => $limit,
         );
         drupal_add_js($settings, 'setting');
+      }
       /**
        * Aggregates JavaScript files into a cache file in the files directory.
+       *
        * The file name for the JavaScript cache file is generated from the hash of
        * the aggregated contents of the files in $files. This forces proxies and
        * browsers to download new JavaScript when the JavaScript changes.
+       *
        * The cache file name is retrieved on a page load via a lookup variable that
        * contains an associative array. The array key is the hash of the names in
        * $files while the value is the cache file name. The cache file is generated
        * in two cases. First, if there is no file name value for the key, which will
        * happen if a new file name has been added to $files or after the lookup
        * variable is emptied to force a rebuild of the cache. Second, the cache file
        * is generated if it is missing on disk. Old cache files are not deleted
        * immediately when the lookup variable is emptied, but are deleted after a set
        * period by drupal_delete_file_if_stale(). This ensures that files referenced
        * by a cached page will still be available.
+       *
        * @param $files
        *   An array of JavaScript files to aggregate and compress into one file.
+       *
        * @return
        *   The URI of the cache file, or FALSE if the file could not be saved.
        */
       function drupal_build_js_cache($files) {
         $contents = '';
         $uri = '';
         $map = variable_get('drupal_js_cache_files', array());
         // Create a new array so that only the file names are used to create the hash.
         // This prevents new aggregates from being created unnecessarily.
         $js_data = array();
         foreach ($files as $file) {
           $js_data[] = $file['data'];
+        }
         $key = hash('sha256', serialize($js_data));
         if (isset($map[$key])) {
           $uri = $map[$key];
+        }
         if (empty($uri) || !file_exists($uri)) {
           // Build aggregate JS file.
           foreach ($files as $path => $info) {
             if ($info['preprocess']) {
               // Append a ';' and a newline after each JS file to prevent them from running together.
               $contents .= file_get_contents($path) . ";\n";
+            }
+          }
           // Prefix filename to prevent blocking by firewalls which reject files
           // starting with "ad*".
           $filename = 'js_' . drupal_hash_base64($contents) . '.js';
           // Create the js/ within the files folder.
           $jspath = 'public://js';
           $uri = $jspath . '/' . $filename;
           // Create the JS file.
           file_prepare_directory($jspath, FILE_CREATE_DIRECTORY);
           if (!file_exists($uri) && !file_unmanaged_save_data($contents, $uri, FILE_EXISTS_REPLACE)) {
             return FALSE;
+          }
           // If JS gzip compression is enabled, clean URLs are enabled (which means
           // that rewrite rules are working) and the zlib extension is available then
           // create a gzipped version of this file. This file is served conditionally
           // to browsers that accept gzip using .htaccess rules.
           if (variable_get('js_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
             if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($contents, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
               return FALSE;
+            }
+          }
           $map[$key] = $uri;
           variable_set('drupal_js_cache_files', $map);
+        }
         return $uri;
+      }
       /**
        * Deletes old cached JavaScript files and variables.
        */
       function drupal_clear_js_cache() {
         variable_del('javascript_parsed');
         variable_del('drupal_js_cache_files');
         file_scan_directory('public://js', '/.*/', array('callback' => 'drupal_delete_file_if_stale'));
+      }
       /**
        * Converts a PHP variable into its JavaScript equivalent.
+       *
        * We use HTML-safe strings, with several characters escaped.
+       *
        * @see drupal_json_decode()
        * @see drupal_json_encode_helper()
        * @ingroup php_wrappers
        */
       function drupal_json_encode($var) {
         // The PHP version cannot change within a request.
         static $php530;
         if (!isset($php530)) {
           $php530 = version_compare(PHP_VERSION, '5.3.0', '>=');
+        }
         if ($php530) {
           // Encode <, >, ', &, and " using the json_encode() options parameter.
           return json_encode($var, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+        }
         // json_encode() escapes <, >, ', &, and " using its options parameter, but
         // does not support this parameter prior to PHP 5.3.0.  Use a helper instead.
         include_once DRUPAL_ROOT . '/includes/json-encode.inc';
         return drupal_json_encode_helper($var);
+      }
       /**
        * Converts an HTML-safe JSON string into its PHP equivalent.
+       *
        * @see drupal_json_encode()
        * @ingroup php_wrappers
        */
       function drupal_json_decode($var) {
         return json_decode($var, TRUE);
+      }
       /**
        * Returns data in JSON format.
+       *
        * This function should be used for JavaScript callback functions returning
        * data in JSON format. It sets the header for JavaScript output.
+       *
        * @param $var
        *   (optional) If set, the variable will be converted to JSON and output.
        */
       function drupal_json_output($var = NULL) {
         // We are returning JSON, so tell the browser.
         drupal_add_http_header('Content-Type', 'application/json');
         if (isset($var)) {
           echo drupal_json_encode($var);
+        }
+      }
       /**
        * Ensures the private key variable used to generate tokens is set.
+       *
        * @return
        *   The private key.
        */
       function drupal_get_private_key() {
         if (!($key = variable_get('drupal_private_key', 0))) {
           $key = drupal_random_key();
           variable_set('drupal_private_key', $key);
+        }
         return $key;
+      }
       /**
        * Generates a token based on $value, the user session, and the private key.
+       *
        * @param $value
        *   An additional value to base the token on.
+       *
        * The generated token is based on the session ID of the current user. Normally,
        * anonymous users do not have a session, so the generated token will be
        * different on every page request. To generate a token for users without a
        * session, manually start a session prior to calling this function.
+       *
        * @return string
        *   A 43-character URL-safe token for validation, based on the user session ID,
        *   the hash salt provided from drupal_get_hash_salt(), and the
        *   'drupal_private_key' configuration variable.
+       *
        * @see drupal_get_hash_salt()
        */
       function drupal_get_token($value = '') {
         return drupal_hmac_base64($value, session_id() . drupal_get_private_key() . drupal_get_hash_salt());
+      }
       /**
        * Validates a token based on $value, the user session, and the private key.
+       *
        * @param $token
        *   The token to be validated.
        * @param $value
        *   An additional value to base the token on.
        * @param $skip_anonymous
        *   Set to true to skip token validation for anonymous users.
+       *
        * @return
        *   True for a valid token, false for an invalid token. When $skip_anonymous
        *   is true, the return value will always be true for anonymous users.
        */
       function drupal_valid_token($token, $value = '', $skip_anonymous = FALSE) {
         global $user;
         return (($skip_anonymous && $user->uid == 0) || ($token === drupal_get_token($value)));
+      }
       function _drupal_bootstrap_full() {
         static $called = FALSE;
         if ($called) {
           return;
+        }
         $called = TRUE;
         require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'includes/path.inc');
         require_once DRUPAL_ROOT . '/includes/theme.inc';
         require_once DRUPAL_ROOT . '/includes/pager.inc';
         require_once DRUPAL_ROOT . '/' . variable_get('menu_inc', 'includes/menu.inc');
         require_once DRUPAL_ROOT . '/includes/tablesort.inc';
         require_once DRUPAL_ROOT . '/includes/file.inc';
         require_once DRUPAL_ROOT . '/includes/unicode.inc';
         require_once DRUPAL_ROOT . '/includes/image.inc';
         require_once DRUPAL_ROOT . '/includes/form.inc';
         require_once DRUPAL_ROOT . '/includes/mail.inc';
         require_once DRUPAL_ROOT . '/includes/actions.inc';
         require_once DRUPAL_ROOT . '/includes/ajax.inc';
         require_once DRUPAL_ROOT . '/includes/token.inc';
         require_once DRUPAL_ROOT . '/includes/errors.inc';
         // Detect string handling method
         unicode_check();
         // Undo magic quotes
         fix_gpc_magic();
         // Load all enabled modules
         module_load_all();
         // Reset drupal_alter() and module_implements() static caches as these
         // include implementations for vital modules only when called early on
         // in the bootstrap.
         drupal_static_reset('drupal_alter');
         drupal_static_reset('module_implements');
         // Make sure all stream wrappers are registered.
         file_get_stream_wrappers();
         // Ensure mt_rand is reseeded, to prevent random values from one page load
         // being exploited to predict random values in subsequent page loads.
         $seed = unpack("L", drupal_random_bytes(4));
         mt_srand($seed[1]);
         $test_info = &$GLOBALS['drupal_test_info'];
         if (!empty($test_info['in_child_site'])) {
           // Running inside the simpletest child site, log fatal errors to test
           // specific file directory.
           ini_set('log_errors', 1);
           ini_set('error_log', 'public://error.log');
+        }
         // Initialize $_GET['q'] prior to invoking hook_init().
         drupal_path_initialize();
         // Let all modules take action before the menu system handles the request.
         // We do not want this while running update.php.
         if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
           // Prior to invoking hook_init(), initialize the theme (potentially a custom
           // one for this page), so that:
           // - Modules with hook_init() implementations that call theme() or
           //   theme_get_registry() don't initialize the incorrect theme.
           // - The theme can have hook_*_alter() implementations affect page building
           //   (e.g., hook_form_alter(), hook_node_view_alter(), hook_page_alter()),
           //   ahead of when rendering starts.
           menu_set_custom_theme();
           drupal_theme_initialize();
           module_invoke_all('init');
+        }
+      }
       /**
        * Stores the current page in the cache.
+       *
        * If page_compression is enabled, a gzipped version of the page is stored in
        * the cache to avoid compressing the output on each request. The cache entry
        * is unzipped in the relatively rare event that the page is requested by a
        * client without gzip support.
+       *
        * Page compression requires the PHP zlib extension
        * (http://php.net/manual/ref.zlib.php).
+       *
        * @see drupal_page_header()
        */
       function drupal_page_set_cache() {
         global $base_root;
         if (drupal_page_is_cacheable()) {
           // Check whether the current page might be compressed.
           $page_compressed = variable_get('page_compression', TRUE) && extension_loaded('zlib');
           $cache = (object) array(
             'cid' => $base_root . request_uri(),
             'data' => array(
               'path' => $_GET['q'],
               'body' => ob_get_clean(),
               'title' => drupal_get_title(),
               'headers' => array(),
               // We need to store whether page was compressed or not,
               // because by the time it is read, the configuration might change.
               'page_compressed' => $page_compressed,
             ),
             'expire' => CACHE_TEMPORARY,
             'created' => REQUEST_TIME,
           );
           // Restore preferred header names based on the lower-case names returned
           // by drupal_get_http_header().
           $header_names = _drupal_set_preferred_header_name();
           foreach (drupal_get_http_header() as $name_lower => $value) {
             $cache->data['headers'][$header_names[$name_lower]] = $value;
             if ($name_lower == 'expires') {
               // Use the actual timestamp from an Expires header if available.
               $cache->expire = strtotime($value);
+            }
+          }
           if ($cache->data['body']) {
             if ($page_compressed) {
               $cache->data['body'] = gzencode($cache->data['body'], 9, FORCE_GZIP);
+            }
             cache_set($cache->cid, $cache->data, 'cache_page', $cache->expire);
+          }
           return $cache;
+        }
+      }
       /**
        * Executes a cron run when called.
+       *
        * Do not call this function from a test. Use $this->cronRun() instead.
+       *
        * @return bool
        *   TRUE if cron ran successfully and FALSE if cron is already running.
        */
       function drupal_cron_run() {
         // Allow execution to continue even if the request gets canceled.
         @ignore_user_abort(TRUE);
         // Prevent session information from being saved while cron is running.
         $original_session_saving = drupal_save_session();
         drupal_save_session(FALSE);
         // Force the current user to anonymous to ensure consistent permissions on
         // cron runs.
         $original_user = $GLOBALS['user'];
         $GLOBALS['user'] = drupal_anonymous_user();
         // Try to allocate enough time to run all the hook_cron implementations.
         drupal_set_time_limit(240);
         $return = FALSE;
         // Grab the defined cron queues.
         $queues = module_invoke_all('cron_queue_info');
         drupal_alter('cron_queue_info', $queues);
         // Try to acquire cron lock.
         if (!lock_acquire('cron', 240.0)) {
           // Cron is still running normally.
           watchdog('cron', 'Attempting to re-run cron while it is already running.', array(), WATCHDOG_WARNING);
+        }
         else {
           // Make sure every queue exists. There is no harm in trying to recreate an
           // existing queue.
           foreach ($queues as $queue_name => $info) {
             DrupalQueue::get($queue_name)->createQueue();
+          }
           // Iterate through the modules calling their cron handlers (if any):
           foreach (module_implements('cron') as $module) {
             // Do not let an exception thrown by one module disturb another.
             try {
               module_invoke($module, 'cron');
+            }
             catch (Exception $e) {
               watchdog_exception('cron', $e);
+            }
+          }
           // Record cron time.
           variable_set('cron_last', REQUEST_TIME);
           watchdog('cron', 'Cron run completed.', array(), WATCHDOG_NOTICE);
           // Release cron lock.
           lock_release('cron');
           // Return TRUE so other functions can check if it did run successfully
           $return = TRUE;
+        }
         foreach ($queues as $queue_name => $info) {
           if (!empty($info['skip on cron'])) {
             // Do not run if queue wants to skip.
             continue;
+          }
           $callback = $info['worker callback'];
           $end = time() + (isset($info['time']) ? $info['time'] : 15);
           $queue = DrupalQueue::get($queue_name);
           while (time() < $end && ($item = $queue->claimItem())) {
             try {
               call_user_func($callback, $item->data);
               $queue->deleteItem($item);
+            }
             catch (Exception $e) {
               // In case of exception log it and leave the item in the queue
               // to be processed again later.
               watchdog_exception('cron', $e);
+            }
+          }
+        }
         // Restore the user.
         $GLOBALS['user'] = $original_user;
         drupal_save_session($original_session_saving);
         return $return;
+      }
       /**
        * DEPRECATED: Shutdown function: Performs cron cleanup.
+       *
        * This function is deprecated because the 'cron_semaphore' variable it
        * references no longer exists. It is therefore no longer used as a shutdown
        * function by Drupal core.
+       *
        * @deprecated
        */
       function drupal_cron_cleanup() {
         // See if the semaphore is still locked.
         if (variable_get('cron_semaphore', FALSE)) {
           watchdog('cron', 'Cron run exceeded the time limit and was aborted.', array(), WATCHDOG_WARNING);
           // Release cron semaphore.
           variable_del('cron_semaphore');
+        }
+      }
       /**
        * Returns information about system object files (modules, themes, etc.).
+       *
        * This function is used to find all or some system object files (module files,
        * theme files, etc.) that exist on the site. It searches in several locations,
        * depending on what type of object you are looking for. For instance, if you
        * are looking for modules and call:
        * @code
        * drupal_system_listing("/\.module$/", "modules", 'name', 0);
        * @endcode
        * this function will search the site-wide modules directory (i.e., /modules/),
        * your installation profile's directory (i.e.,
        * /profiles/your_site_profile/modules/), the all-sites directory (i.e.,
        * /sites/all/modules/), and your site-specific directory (i.e.,
        * /sites/your_site_dir/modules/), in that order, and return information about
        * all of the files ending in .module in those directories.
+       *
        * The information is returned in an associative array, which can be keyed on
        * the file name ($key = 'filename'), the file name without the extension ($key
        * = 'name'), or the full file stream URI ($key = 'uri'). If you use a key of
        * 'filename' or 'name', files found later in the search will take precedence
        * over files found earlier (unless they belong to a module or theme not
        * compatible with Drupal core); if you choose a key of 'uri', you will get all
        * files found.
+       *
        * @param string $mask
        *   The preg_match() regular expression for the files to find.
        * @param string $directory
        *   The subdirectory name in which the files are found. For example,
        *   'modules' will search in sub-directories of the top-level /modules
        *   directory, sub-directories of /sites/all/modules/, etc.
        * @param string $key
        *   The key to be used for the associative array returned. Possible values are
        *   'uri', for the file's URI; 'filename', for the basename of the file; and
        *   'name' for the name of the file without the extension. If you choose 'name'
        *   or 'filename', only the highest-precedence file will be returned.
        * @param int $min_depth
        *   Minimum depth of directories to return files from, relative to each
        *   directory searched. For instance, a minimum depth of 2 would find modules
        *   inside /modules/node/tests, but not modules directly in /modules/node.
+       *
        * @return array
        *   An associative array of file objects, keyed on the chosen key. Each element
        *   in the array is an object containing file information, with properties:
        *   - 'uri': Full URI of the file.
        *   - 'filename': File name.
        *   - 'name': Name of file without the extension.
        */
       function drupal_system_listing($mask, $directory, $key = 'name', $min_depth = 1) {
         $config = conf_path();
         $searchdir = array($directory);
         $files = array();
         // The 'profiles' directory contains pristine collections of modules and
         // themes as organized by a distribution. It is pristine in the same way
         // that /modules is pristine for core; users should avoid changing anything
         // there in favor of sites/all or sites/<domain> directories.
         $profiles = array();
         $profile = drupal_get_profile();
         // For SimpleTest to be able to test modules packaged together with a
         // distribution we need to include the profile of the parent site (in which
         // test runs are triggered).
         if (drupal_valid_test_ua()) {
           $testing_profile = variable_get('simpletest_parent_profile', FALSE);
           if ($testing_profile && $testing_profile != $profile) {
             $profiles[] = $testing_profile;
+          }
+        }
         // In case both profile directories contain the same extension, the actual
         // profile always has precedence.
         $profiles[] = $profile;
         foreach ($profiles as $profile) {
           if (file_exists("profiles/$profile/$directory")) {
             $searchdir[] = "profiles/$profile/$directory";
+          }
+        }
         // Always search sites/all/* as well as the global directories.
         $searchdir[] = 'sites/all/' . $directory;
         if (file_exists("$config/$directory")) {
           $searchdir[] = "$config/$directory";
+        }
         // Get current list of items.
         if (!function_exists('file_scan_directory')) {
           require_once DRUPAL_ROOT . '/includes/file.inc';
+        }
         foreach ($searchdir as $dir) {
           $files_to_add = file_scan_directory($dir, $mask, array('key' => $key, 'min_depth' => $min_depth));
           // Duplicate files found in later search directories take precedence over
           // earlier ones, so we want them to overwrite keys in our resulting
           // $files array.
           // The exception to this is if the later file is from a module or theme not
           // compatible with Drupal core. This may occur during upgrades of Drupal
           // core when new modules exist in core while older contrib modules with the
           // same name exist in a directory such as sites/all/modules/.
           foreach (array_intersect_key($files_to_add, $files) as $file_key => $file) {
             // If it has no info file, then we just behave liberally and accept the
             // new resource on the list for merging.
             if (file_exists($info_file = dirname($file->uri) . '/' . $file->name . '.info')) {
               // Get the .info file for the module or theme this file belongs to.
               $info = drupal_parse_info_file($info_file);
               // If the module or theme is incompatible with Drupal core, remove it
               // from the array for the current search directory, so it is not
               // overwritten when merged with the $files array.
               if (isset($info['core']) && $info['core'] != DRUPAL_CORE_COMPATIBILITY) {
                 unset($files_to_add[$file_key]);
+              }
+            }
+          }
           $files = array_merge($files, $files_to_add);
+        }
         return $files;
+      }
       /**
        * Sets the main page content value for later use.
+       *
        * Given the nature of the Drupal page handling, this will be called once with
        * a string or array. We store that and return it later as the block is being
        * displayed.
+       *
        * @param $content
        *   A string or renderable array representing the body of the page.
+       *
        * @return
        *   If called without $content, a renderable array representing the body of
        *   the page.
        */
       function drupal_set_page_content($content = NULL) {
         $content_block = &drupal_static(__FUNCTION__, NULL);
         $main_content_display = &drupal_static('system_main_content_added', FALSE);
         if (!empty($content)) {
           $content_block = (is_array($content) ? $content : array('main' => array('#markup' => $content)));
+        }
         else {
           // Indicate that the main content has been requested. We assume that
           // the module requesting the content will be adding it to the page.
           // A module can indicate that it does not handle the content by setting
           // the static variable back to FALSE after calling this function.
           $main_content_display = TRUE;
           return $content_block;
+        }
+      }
       /**
        * #pre_render callback to render #browsers into #prefix and #suffix.
+       *
        * @param $elements
        *   A render array with a '#browsers' property. The '#browsers' property can
        *   contain any or all of the following keys:
        *   - 'IE': If FALSE, the element is not rendered by Internet Explorer. If
        *     TRUE, the element is rendered by Internet Explorer. Can also be a string
        *     containing an expression for Internet Explorer to evaluate as part of a
        *     conditional comment. For example, this can be set to 'lt IE 7' for the
        *     element to be rendered in Internet Explorer 6, but not in Internet
        *     Explorer 7 or higher. Defaults to TRUE.
        *   - '!IE': If FALSE, the element is not rendered by browsers other than
        *     Internet Explorer. If TRUE, the element is rendered by those browsers.
        *     Defaults to TRUE.
        *   Examples:
        *   - To render an element in all browsers, '#browsers' can be left out or set
        *     to array('IE' => TRUE, '!IE' => TRUE).
        *   - To render an element in Internet Explorer only, '#browsers' can be set
        *     to array('!IE' => FALSE).
        *   - To render an element in Internet Explorer 6 only, '#browsers' can be set
        *     to array('IE' => 'lt IE 7', '!IE' => FALSE).
        *   - To render an element in Internet Explorer 8 and higher and in all other
        *     browsers, '#browsers' can be set to array('IE' => 'gte IE 8').
+       *
        * @return
        *   The passed-in element with markup for conditional comments potentially
        *   added to '#prefix' and '#suffix'.
        */
       function drupal_pre_render_conditional_comments($elements) {
         $browsers = isset($elements['#browsers']) ? $elements['#browsers'] : array();
         $browsers += array(
           'IE' => TRUE,
           '!IE' => TRUE,
         );
         // If rendering in all browsers, no need for conditional comments.
         if ($browsers['IE'] === TRUE && $browsers['!IE']) {
           return $elements;
+        }
         // Determine the conditional comment expression for Internet Explorer to
         // evaluate.
         if ($browsers['IE'] === TRUE) {
           $expression = 'IE';
+        }
         elseif ($browsers['IE'] === FALSE) {
           $expression = '!IE';
+        }
         else {
           $expression = $browsers['IE'];
+        }
         // Wrap the element's potentially existing #prefix and #suffix properties with
         // conditional comment markup. The conditional comment expression is evaluated
         // by Internet Explorer only. To control the rendering by other browsers,
         // either the "downlevel-hidden" or "downlevel-revealed" technique must be
         // used. See http://en.wikipedia.org/wiki/Conditional_comment for details.
         $elements += array(
           '#prefix' => '',
           '#suffix' => '',
         );
         if (!$browsers['!IE']) {
           // "downlevel-hidden".
           $elements['#prefix'] = "\n<!--[if $expression]>\n" . $elements['#prefix'];
           $elements['#suffix'] .= "<![endif]-->\n";
+        }
         else {
           // "downlevel-revealed".
           $elements['#prefix'] = "\n<!--[if $expression]><!-->\n" . $elements['#prefix'];
           $elements['#suffix'] .= "<!--<![endif]-->\n";
+        }
         return $elements;
+      }
       /**
        * #pre_render callback to render a link into #markup.
+       *
        * Doing so during pre_render gives modules a chance to alter the link parts.
+       *
        * @param $elements
        *   A structured array whose keys form the arguments to l():
        *   - #title: The link text to pass as argument to l().
        *   - #href: The URL path component to pass as argument to l().
        *   - #options: (optional) An array of options to pass to l().
+       *
        * @return
        *   The passed-in elements containing a rendered link in '#markup'.
        */
       function drupal_pre_render_link($element) {
         // By default, link options to pass to l() are normally set in #options.
         $element += array('#options' => array());
         // However, within the scope of renderable elements, #attributes is a valid
         // way to specify attributes, too. Take them into account, but do not override
         // attributes from #options.
         if (isset($element['#attributes'])) {
           $element['#options'] += array('attributes' => array());
           $element['#options']['attributes'] += $element['#attributes'];
+        }
         // This #pre_render callback can be invoked from inside or outside of a Form
         // API context, and depending on that, a HTML ID may be already set in
         // different locations. #options should have precedence over Form API's #id.
         // #attributes have been taken over into #options above already.
         if (isset($element['#options']['attributes']['id'])) {
           $element['#id'] = $element['#options']['attributes']['id'];
+        }
         elseif (isset($element['#id'])) {
           $element['#options']['attributes']['id'] = $element['#id'];
+        }
         // Conditionally invoke ajax_pre_render_element(), if #ajax is set.
         if (isset($element['#ajax']) && !isset($element['#ajax_processed'])) {
           // If no HTML ID was found above, automatically create one.
           if (!isset($element['#id'])) {
             $element['#id'] = $element['#options']['attributes']['id'] = drupal_html_id('ajax-link');
+          }
           // If #ajax['path] was not specified, use the href as Ajax request URL.
           if (!isset($element['#ajax']['path'])) {
             $element['#ajax']['path'] = $element['#href'];
             $element['#ajax']['options'] = $element['#options'];
+          }
           $element = ajax_pre_render_element($element);
+        }
         $element['#markup'] = l($element['#title'], $element['#href'], $element['#options']);
         return $element;
+      }
       /**
        * #pre_render callback that collects child links into a single array.
+       *
        * This function can be added as a pre_render callback for a renderable array,
        * usually one which will be themed by theme_links(). It iterates through all
        * unrendered children of the element, collects any #links properties it finds,
        * merges them into the parent element's #links array, and prevents those
        * children from being rendered separately.
+       *
        * The purpose of this is to allow links to be logically grouped into related
        * categories, so that each child group can be rendered as its own list of
        * links if drupal_render() is called on it, but calling drupal_render() on the
        * parent element will still produce a single list containing all the remaining
        * links, regardless of what group they were in.
+       *
        * A typical example comes from node links, which are stored in a renderable
        * array similar to this:
        * @code
        * $node->content['links'] = array(
        *   '#theme' => 'links__node',
        *   '#pre_render' => array('drupal_pre_render_links'),
        *   'comment' => array(
        *     '#theme' => 'links__node__comment',
        *     '#links' => array(
        *       // An array of links associated with node comments, suitable for
        *       // passing in to theme_links().
        *     ),
        *   ),
        *   'statistics' => array(
        *     '#theme' => 'links__node__statistics',
        *     '#links' => array(
        *       // An array of links associated with node statistics, suitable for
        *       // passing in to theme_links().
        *     ),
        *   ),
        *   'translation' => array(
        *     '#theme' => 'links__node__translation',
        *     '#links' => array(
        *       // An array of links associated with node translation, suitable for
        *       // passing in to theme_links().
        *     ),
        *   ),
        * );
        * @endcode
+       *
        * In this example, the links are grouped by functionality, which can be
        * helpful to themers who want to display certain kinds of links independently.
        * For example, adding this code to node.tpl.php will result in the comment
        * links being rendered as a single list:
        * @code
        * print render($content['links']['comment']);
        * @endcode
+       *
        * (where $node->content has been transformed into $content before handing
        * control to the node.tpl.php template).
+       *
        * The pre_render function defined here allows the above flexibility, but also
        * allows the following code to be used to render all remaining links into a
        * single list, regardless of their group:
        * @code
        * print render($content['links']);
        * @endcode
+       *
        * In the above example, this will result in the statistics and translation
        * links being rendered together in a single list (but not the comment links,
        * which were rendered previously on their own).
+       *
        * Because of the way this function works, the individual properties of each
        * group (for example, a group-specific #theme property such as
        * 'links__node__comment' in the example above, or any other property such as
        * #attributes or #pre_render that is attached to it) are only used when that
        * group is rendered on its own. When the group is rendered together with other
        * children, these child-specific properties are ignored, and only the overall
        * properties of the parent are used.
        */
       function drupal_pre_render_links($element) {
         $element += array('#links' => array());
         foreach (element_children($element) as $key) {
           $child = &$element[$key];
           // If the child has links which have not been printed yet and the user has
           // access to it, merge its links in to the parent.
           if (isset($child['#links']) && empty($child['#printed']) && (!isset($child['#access']) || $child['#access'])) {
             $element['#links'] += $child['#links'];
             // Mark the child as having been printed already (so that its links
             // cannot be mistakenly rendered twice).
             $child['#printed'] = TRUE;
+          }
+        }
         return $element;
+      }
       /**
        * #pre_render callback to append contents in #markup to #children.
+       *
        * This needs to be a #pre_render callback, because eventually assigned
        * #theme_wrappers will expect the element's rendered content in #children.
        * Note that if also a #theme is defined for the element, then the result of
        * the theme callback will override #children.
+       *
        * @param $elements
        *   A structured array using the #markup key.
+       *
        * @return
        *   The passed-in elements, but #markup appended to #children.
+       *
        * @see drupal_render()
        */
       function drupal_pre_render_markup($elements) {
         $elements['#children'] = $elements['#markup'];
         return $elements;
+      }
       /**
        * Renders the page, including all theming.
+       *
        * @param $page
        *   A string or array representing the content of a page. The array consists of
        *   the following keys:
        *   - #type: Value is always 'page'. This pushes the theming through
        *     page.tpl.php (required).
        *   - #show_messages: Suppress drupal_get_message() items. Used by Batch
        *     API (optional).
+       *
        * @see hook_page_alter()
        * @see element_info()
        */
       function drupal_render_page($page) {
         $main_content_display = &drupal_static('system_main_content_added', FALSE);
         // Allow menu callbacks to return strings or arbitrary arrays to render.
         // If the array returned is not of #type page directly, we need to fill
         // in the page with defaults.
         if (is_string($page) || (is_array($page) && (!isset($page['#type']) || ($page['#type'] != 'page')))) {
           drupal_set_page_content($page);
           $page = element_info('page');
+        }
         // Modules can add elements to $page as needed in hook_page_build().
         foreach (module_implements('page_build') as $module) {
           $function = $module . '_page_build';
           $function($page);
+        }
         // Modules alter the $page as needed. Blocks are populated into regions like
         // 'sidebar_first', 'footer', etc.
         drupal_alter('page', $page);
         // If no module has taken care of the main content, add it to the page now.
         // This allows the site to still be usable even if no modules that
         // control page regions (for example, the Block module) are enabled.
         if (!$main_content_display) {
           $page['content']['system_main'] = drupal_set_page_content();
+        }
         return drupal_render($page);
+      }
       /**
        * Renders HTML given a structured array tree.
+       *
        * Recursively iterates over each of the array elements, generating HTML code.
+       *
        * Renderable arrays have two kinds of key/value pairs: properties and
        * children. Properties have keys starting with '#' and their values influence
        * how the array will be rendered. Children are all elements whose keys do not
        * start with a '#'. Their values should be renderable arrays themselves,
        * which will be rendered during the rendering of the parent array. The markup
        * provided by the children is typically inserted into the markup generated by
        * the parent array.
+       *
        * HTML generation for a renderable array, and the treatment of any children,
        * is controlled by two properties containing theme functions, #theme and
        * #theme_wrappers.
+       *
        * #theme is the theme function called first. If it is set and the element has
        * any children, it is the responsibility of the theme function to render
        * these children. For elements that are not allowed to have any children,
        * e.g. buttons or textfields, the theme function can be used to render the
        * element itself. If #theme is not present and the element has children, each
        * child is itself rendered by a call to drupal_render(), and the results are
        * concatenated.
+       *
        * The #theme_wrappers property contains an array of theme functions which will
        * be called, in order, after #theme has run. These can be used to add further
        * markup around the rendered children; e.g., fieldsets add the required markup
        * for a fieldset around their rendered child elements. All wrapper theme
        * functions have to include the element's #children property in their output,
        * as it contains the output of the previous theme functions and the rendered
        * children.
+       *
        * For example, for the form element type, by default only the #theme_wrappers
        * property is set, which adds the form markup around the rendered child
        * elements of the form. This allows you to set the #theme property on a
        * specific form to a custom theme function, giving you complete control over
        * the placement of the form's children while not at all having to deal with
        * the form markup itself.
+       *
        * drupal_render() can optionally cache the rendered output of elements to
        * improve performance. To use drupal_render() caching, set the element's #cache
        * property to an associative array with one or several of the following keys:
        * - 'keys': An array of one or more keys that identify the element. If 'keys'
        *   is set, the cache ID is created automatically from these keys. See
        *   drupal_render_cid_create().
        * - 'granularity' (optional): Define the cache granularity using binary
        *   combinations of the cache granularity constants, e.g.
        *   DRUPAL_CACHE_PER_USER to cache for each user separately or
        *   DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE to cache separately for each
        *   page and role. If not specified the element is cached globally for each
        *   theme and language.
        * - 'cid': Specify the cache ID directly. Either 'keys' or 'cid' is required.
        *   If 'cid' is set, 'keys' and 'granularity' are ignored. Use only if you
        *   have special requirements.
        * - 'expire': Set to one of the cache lifetime constants.
        * - 'bin': Specify a cache bin to cache the element in. Defaults to 'cache'.
+       *
        * This function is usually called from within another function, like
        * drupal_get_form() or a theme function. Elements are sorted internally
        * using uasort(). Since this is expensive, when passing already sorted
        * elements to drupal_render(), for example from a database query, set
        * $elements['#sorted'] = TRUE to avoid sorting them a second time.
+       *
        * drupal_render() flags each element with a '#printed' status to indicate that
        * the element has been rendered, which allows individual elements of a given
        * array to be rendered independently and prevents them from being rendered
        * more than once on subsequent calls to drupal_render() (e.g., as part of a
        * larger array). If the same array or array element is passed more than once
        * to drupal_render(), it simply returns an empty string.
+       *
        * @param array $elements
        *   The structured array describing the data to be rendered.
+       *
        * @return string
        *   The rendered HTML.
        */
       function drupal_render(&$elements) {
         // Early-return nothing if user does not have access.
         if (empty($elements) || (isset($elements['#access']) && !$elements['#access'])) {
           return '';
+        }
         // Do not print elements twice.
         if (!empty($elements['#printed'])) {
           return '';
+        }
         // Try to fetch the element's markup from cache and return.
         if (isset($elements['#cache'])) {
           $cached_output = drupal_render_cache_get($elements);
           if ($cached_output !== FALSE) {
             return $cached_output;
+          }
+        }
         // If #markup is set, ensure #type is set. This allows to specify just #markup
         // on an element without setting #type.
         if (isset($elements['#markup']) && !isset($elements['#type'])) {
           $elements['#type'] = 'markup';
+        }
         // If the default values for this element have not been loaded yet, populate
         // them.
         if (isset($elements['#type']) && empty($elements['#defaults_loaded'])) {
           $elements += element_info($elements['#type']);
+        }
         // Make any final changes to the element before it is rendered. This means
         // that the $element or the children can be altered or corrected before the
         // element is rendered into the final text.
         if (isset($elements['#pre_render'])) {
           foreach ($elements['#pre_render'] as $function) {
             if (function_exists($function)) {
               $elements = $function($elements);
+            }
+          }
+        }
         // Allow #pre_render to abort rendering.
         if (!empty($elements['#printed'])) {
           return '';
+        }
         // Get the children of the element, sorted by weight.
         $children = element_children($elements, TRUE);
         // Initialize this element's #children, unless a #pre_render callback already
         // preset #children.
         if (!isset($elements['#children'])) {
           $elements['#children'] = '';
+        }
         // Call the element's #theme function if it is set. Then any children of the
         // element have to be rendered there.
         if (isset($elements['#theme'])) {
           $elements['#children'] = theme($elements['#theme'], $elements);
+        }
         // If #theme was not set and the element has children, render them now.
         // This is the same process as drupal_render_children() but is inlined
         // for speed.
         if ($elements['#children'] == '') {
           foreach ($children as $key) {
             $elements['#children'] .= drupal_render($elements[$key]);
+          }
+        }
         // Let the theme functions in #theme_wrappers add markup around the rendered
         // children.
         if (isset($elements['#theme_wrappers'])) {
           foreach ($elements['#theme_wrappers'] as $theme_wrapper) {
             $elements['#children'] = theme($theme_wrapper, $elements);
+          }
+        }
         // Filter the outputted content and make any last changes before the
         // content is sent to the browser. The changes are made on $content
         // which allows the output'ed text to be filtered.
         if (isset($elements['#post_render'])) {
           foreach ($elements['#post_render'] as $function) {
             if (function_exists($function)) {
               $elements['#children'] = $function($elements['#children'], $elements);
+            }
+          }
+        }
         // Add any JavaScript state information associated with the element.
         if (!empty($elements['#states'])) {
           drupal_process_states($elements);
+        }
         // Add additional libraries, CSS, JavaScript an other custom
         // attached data associated with this element.
         if (!empty($elements['#attached'])) {
           drupal_process_attached($elements);
+        }
         $prefix = isset($elements['#prefix']) ? $elements['#prefix'] : '';
         $suffix = isset($elements['#suffix']) ? $elements['#suffix'] : '';
         $output = $prefix . $elements['#children'] . $suffix;
         // Cache the processed element if #cache is set.
         if (isset($elements['#cache'])) {
           drupal_render_cache_set($output, $elements);
+        }
         $elements['#printed'] = TRUE;
         return $output;
+      }
       /**
        * Renders children of an element and concatenates them.
+       *
        * @param array $element
        *   The structured array whose children shall be rendered.
        * @param array $children_keys
        *   (optional) If the keys of the element's children are already known, they
        *   can be passed in to save another run of element_children().
+       *
        * @return string
        *   The rendered HTML of all children of the element.
        * @see drupal_render()
        */
       function drupal_render_children(&$element, $children_keys = NULL) {
         if ($children_keys === NULL) {
           $children_keys = element_children($element);
+        }
         $output = '';
         foreach ($children_keys as $key) {
           if (!empty($element[$key])) {
             $output .= drupal_render($element[$key]);
+          }
+        }
         return $output;
+      }
       /**
        * Renders an element.
+       *
        * This function renders an element using drupal_render(). The top level
        * element is shown with show() before rendering, so it will always be rendered
        * even if hide() had been previously used on it.
+       *
        * @param $element
        *   The element to be rendered.
+       *
        * @return
        *   The rendered element.
+       *
        * @see drupal_render()
        * @see show()
        * @see hide()
        */
       function render(&$element) {
         if (is_array($element)) {
           show($element);
           return drupal_render($element);
+        }
         else {
           // Safe-guard for inappropriate use of render() on flat variables: return
           // the variable as-is.
           return $element;
+        }
+      }
       /**
        * Hides an element from later rendering.
+       *
        * The first time render() or drupal_render() is called on an element tree,
        * as each element in the tree is rendered, it is marked with a #printed flag
        * and the rendered children of the element are cached. Subsequent calls to
        * render() or drupal_render() will not traverse the child tree of this element
        * again: they will just use the cached children. So if you want to hide an
        * element, be sure to call hide() on the element before its parent tree is
        * rendered for the first time, as it will have no effect on subsequent
        * renderings of the parent tree.
+       *
        * @param $element
        *   The element to be hidden.
+       *
        * @return
        *   The element.
+       *
        * @see render()
        * @see show()
        */
       function hide(&$element) {
         $element['#printed'] = TRUE;
         return $element;
+      }
       /**
        * Shows a hidden element for later rendering.
+       *
        * You can also use render($element), which shows the element while rendering
        * it.
+       *
        * The first time render() or drupal_render() is called on an element tree,
        * as each element in the tree is rendered, it is marked with a #printed flag
        * and the rendered children of the element are cached. Subsequent calls to
        * render() or drupal_render() will not traverse the child tree of this element
        * again: they will just use the cached children. So if you want to show an
        * element, be sure to call show() on the element before its parent tree is
        * rendered for the first time, as it will have no effect on subsequent
        * renderings of the parent tree.
+       *
        * @param $element
        *   The element to be shown.
+       *
        * @return
        *   The element.
+       *
        * @see render()
        * @see hide()
        */
       function show(&$element) {
         $element['#printed'] = FALSE;
         return $element;
+      }
       /**
        * Gets the rendered output of a renderable element from the cache.
+       *
        * @param $elements
        *   A renderable array.
+       *
        * @return
        *   A markup string containing the rendered content of the element, or FALSE
        *   if no cached copy of the element is available.
+       *
        * @see drupal_render()
        * @see drupal_render_cache_set()
        */
       function drupal_render_cache_get($elements) {
         if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
           return FALSE;
+        }
         $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'cache';
         if (!empty($cid) && $cache = cache_get($cid, $bin)) {
           // Add additional libraries, JavaScript, CSS and other data attached
           // to this element.
           if (isset($cache->data['#attached'])) {
             drupal_process_attached($cache->data);
+          }
           // Return the rendered output.
           return $cache->data['#markup'];
+        }
         return FALSE;
+      }
       /**
        * Caches the rendered output of a renderable element.
+       *
        * This is called by drupal_render() if the #cache property is set on an
        * element.
+       *
        * @param $markup
        *   The rendered output string of $elements.
        * @param $elements
        *   A renderable array.
+       *
        * @see drupal_render_cache_get()
        */
       function drupal_render_cache_set(&$markup, $elements) {
         // Create the cache ID for the element.
         if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
           return FALSE;
+        }
         // Cache implementations are allowed to modify the markup, to support
         // replacing markup with edge-side include commands. The supporting cache
         // backend will store the markup in some other key (like
         // $data['#real-value']) and return an include command instead. When the
         // ESI command is executed by the content accelerator, the real value can
         // be retrieved and used.
         $data['#markup'] = &$markup;
         // Persist attached data associated with this element.
         $attached = drupal_render_collect_attached($elements, TRUE);
         if ($attached) {
           $data['#attached'] = $attached;
+        }
         $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'cache';
         $expire = isset($elements['#cache']['expire']) ? $elements['#cache']['expire'] : CACHE_PERMANENT;
         cache_set($cid, $data, $bin, $expire);
+      }
       /**
        * Collects #attached for an element and its children into a single array.
+       *
        * When caching elements, it is necessary to collect all libraries, JavaScript
        * and CSS into a single array, from both the element itself and all child
        * elements. This allows drupal_render() to add these back to the page when the
        * element is returned from cache.
+       *
        * @param $elements
        *   The element to collect #attached from.
        * @param $return
        *   Whether to return the attached elements and reset the internal static.
+       *
        * @return
        *   The #attached array for this element and its descendants.
        */
       function drupal_render_collect_attached($elements, $return = FALSE) {
         $attached = &drupal_static(__FUNCTION__, array());
         // Collect all #attached for this element.
         if (isset($elements['#attached'])) {
           foreach ($elements['#attached'] as $key => $value) {
             if (!isset($attached[$key])) {
               $attached[$key] = array();
+            }
             $attached[$key] = array_merge($attached[$key], $value);
+          }
+        }
         if ($children = element_children($elements)) {
           foreach ($children as $child) {
             drupal_render_collect_attached($elements[$child]);
+          }
+        }
         // If this was the first call to the function, return all attached elements
         // and reset the static cache.
         if ($return) {
           $return = $attached;
           $attached = array();
           return $return;
+        }
+      }
       /**
        * Prepares an element for caching based on a query.
+       *
        * This smart caching strategy saves Drupal from querying and rendering to HTML
        * when the underlying query is unchanged.
+       *
        * Expensive queries should use the query builder to create the query and then
        * call this function. Executing the query and formatting results should happen
        * in a #pre_render callback.
+       *
        * @param $query
        *   A select query object as returned by db_select().
        * @param $function
        *   The name of the function doing this caching. A _pre_render suffix will be
        *   added to this string and is also part of the cache key in
        *   drupal_render_cache_set() and drupal_render_cache_get().
        * @param $expire
        *   The cache expire time, passed eventually to cache_set().
        * @param $granularity
        *   One or more granularity constants passed to drupal_render_cid_parts().
+       *
        * @return
        *   A renderable array with the following keys and values:
        *   - #query: The passed-in $query.
        *   - #pre_render: $function with a _pre_render suffix.
        *   - #cache: An associative array prepared for drupal_render_cache_set().
        */
       function drupal_render_cache_by_query($query, $function, $expire = CACHE_TEMPORARY, $granularity = NULL) {
         $cache_keys = array_merge(array($function), drupal_render_cid_parts($granularity));
         $query->preExecute();
         $cache_keys[] = hash('sha256', serialize(array((string) $query, $query->getArguments())));
         return array(
           '#query' => $query,
           '#pre_render' => array($function . '_pre_render'),
           '#cache' => array(
             'keys' => $cache_keys,
             'expire' => $expire,
           ),
         );
+      }
       /**
        * Returns cache ID parts for building a cache ID.
+       *
        * @param $granularity
        *   One or more cache granularity constants. For example, to cache separately
        *   for each user, use DRUPAL_CACHE_PER_USER. To cache separately for each
        *   page and role, use the expression:
        *   @code
        *   DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE
        *   @endcode
+       *
        * @return
        *   An array of cache ID parts, always containing the active theme. If the
        *   locale module is enabled it also contains the active language. If
        *   $granularity was passed in, more parts are added.
        */
       function drupal_render_cid_parts($granularity = NULL) {
         global $theme, $base_root, $user;
         $cid_parts[] = $theme;
         // If Locale is enabled but we have only one language we do not need it as cid
         // part.
         if (drupal_multilingual()) {
           foreach (language_types_configurable() as $language_type) {
             $cid_parts[] = $GLOBALS[$language_type]->language;
+          }
+        }
         if (!empty($granularity)) {
           $cache_per_role = $granularity & DRUPAL_CACHE_PER_ROLE;
           $cache_per_user = $granularity & DRUPAL_CACHE_PER_USER;
           // User 1 has special permissions outside of the role system, so when
           // caching per role is requested, it should cache per user instead.
           if ($user->uid == 1 && $cache_per_role) {
             $cache_per_user = TRUE;
             $cache_per_role = FALSE;
+          }
           // 'PER_ROLE' and 'PER_USER' are mutually exclusive. 'PER_USER' can be a
           // resource drag for sites with many users, so when a module is being
           // equivocal, we favor the less expensive 'PER_ROLE' pattern.
           if ($cache_per_role) {
             $cid_parts[] = 'r.' . implode(',', array_keys($user->roles));
+          }
           elseif ($cache_per_user) {
             $cid_parts[] = "u.$user->uid";
+          }
           if ($granularity & DRUPAL_CACHE_PER_PAGE) {
             $cid_parts[] = $base_root . request_uri();
+          }
+        }
         return $cid_parts;
+      }
       /**
        * Creates the cache ID for a renderable element.
+       *
        * This creates the cache ID string, either by returning the #cache['cid']
        * property if present or by building the cache ID out of the #cache['keys']
        * and, optionally, the #cache['granularity'] properties.
+       *
        * @param $elements
        *   A renderable array.
+       *
        * @return
        *   The cache ID string, or FALSE if the element may not be cached.
        */
       function drupal_render_cid_create($elements) {
         if (isset($elements['#cache']['cid'])) {
           return $elements['#cache']['cid'];
+        }
         elseif (isset($elements['#cache']['keys'])) {
           $granularity = isset($elements['#cache']['granularity']) ? $elements['#cache']['granularity'] : NULL;
           // Merge in additional cache ID parts based provided by drupal_render_cid_parts().
           $cid_parts = array_merge($elements['#cache']['keys'], drupal_render_cid_parts($granularity));
           return implode(':', $cid_parts);
+        }
         return FALSE;
+      }
       /**
        * Function used by uasort to sort structured arrays by weight.
        */
       function element_sort($a, $b) {
         $a_weight = (is_array($a) && isset($a['#weight'])) ? $a['#weight'] : 0;
         $b_weight = (is_array($b) && isset($b['#weight'])) ? $b['#weight'] : 0;
         if ($a_weight == $b_weight) {
           return 0;
+        }
         return ($a_weight < $b_weight) ? -1 : 1;
+      }
       /**
        * Array sorting callback; sorts elements by title.
        */
       function element_sort_by_title($a, $b) {
         $a_title = (is_array($a) && isset($a['#title'])) ? $a['#title'] : '';
         $b_title = (is_array($b) && isset($b['#title'])) ? $b['#title'] : '';
         return strnatcasecmp($a_title, $b_title);
+      }
       /**
        * Retrieves the default properties for the defined element type.
+       *
        * @param $type
        *   An element type as defined by hook_element_info().
        */
       function element_info($type) {
         // Use the advanced drupal_static() pattern, since this is called very often.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast)) {
           $drupal_static_fast['cache'] = &drupal_static(__FUNCTION__);
+        }
         $cache = &$drupal_static_fast['cache'];
         if (!isset($cache)) {
           $cache = module_invoke_all('element_info');
           foreach ($cache as $element_type => $info) {
             $cache[$element_type]['#type'] = $element_type;
+          }
           // Allow modules to alter the element type defaults.
           drupal_alter('element_info', $cache);
+        }
         return isset($cache[$type]) ? $cache[$type] : array();
+      }
       /**
        * Retrieves a single property for the defined element type.
+       *
        * @param $type
        *   An element type as defined by hook_element_info().
        * @param $property_name
        *   The property within the element type that should be returned.
        * @param $default
        *   (Optional) The value to return if the element type does not specify a
        *   value for the property. Defaults to NULL.
        */
       function element_info_property($type, $property_name, $default = NULL) {
         return (($info = element_info($type)) && array_key_exists($property_name, $info)) ? $info[$property_name] : $default;
+      }
       /**
        * Sorts a structured array by the 'weight' element.
+       *
        * Note that the sorting is by the 'weight' array element, not by the render
        * element property '#weight'.
+       *
        * Callback for uasort() used in various functions.
+       *
        * @param $a
        *   First item for comparison. The compared items should be associative arrays
        *   that optionally include a 'weight' element. For items without a 'weight'
        *   element, a default value of 0 will be used.
        * @param $b
        *   Second item for comparison.
        */
       function drupal_sort_weight($a, $b) {
         $a_weight = (is_array($a) && isset($a['weight'])) ? $a['weight'] : 0;
         $b_weight = (is_array($b) && isset($b['weight'])) ? $b['weight'] : 0;
         if ($a_weight == $b_weight) {
           return 0;
+        }
         return ($a_weight < $b_weight) ? -1 : 1;
+      }
       /**
        * Array sorting callback; sorts elements by 'title' key.
        */
       function drupal_sort_title($a, $b) {
         if (!isset($b['title'])) {
           return -1;
+        }
         if (!isset($a['title'])) {
           return 1;
+        }
         return strcasecmp($a['title'], $b['title']);
+      }
       /**
        * Checks if the key is a property.
        */
       function element_property($key) {
         return $key[0] == '#';
+      }
       /**
        * Gets properties of a structured array element (keys beginning with '#').
        */
       function element_properties($element) {
         return array_filter(array_keys((array) $element), 'element_property');
+      }
       /**
        * Checks if the key is a child.
        */
       function element_child($key) {
         return !isset($key[0]) || $key[0] != '#';
+      }
       /**
        * Identifies the children of an element array, optionally sorted by weight.
+       *
        * The children of a element array are those key/value pairs whose key does
        * not start with a '#'. See drupal_render() for details.
+       *
        * @param $elements
        *   The element array whose children are to be identified.
        * @param $sort
        *   Boolean to indicate whether the children should be sorted by weight.
+       *
        * @return
        *   The array keys of the element's children.
        */
       function element_children(&$elements, $sort = FALSE) {
         // Do not attempt to sort elements which have already been sorted.
         $sort = isset($elements['#sorted']) ? !$elements['#sorted'] : $sort;
         // Filter out properties from the element, leaving only children.
         $children = array();
         $sortable = FALSE;
         foreach ($elements as $key => $value) {
           if ($key === '' || $key[0] !== '#') {
             $children[$key] = $value;
             if (is_array($value) && isset($value['#weight'])) {
               $sortable = TRUE;
+            }
+          }
+        }
         // Sort the children if necessary.
         if ($sort && $sortable) {
           uasort($children, 'element_sort');
           // Put the sorted children back into $elements in the correct order, to
           // preserve sorting if the same element is passed through
           // element_children() twice.
           foreach ($children as $key => $child) {
             unset($elements[$key]);
             $elements[$key] = $child;
+          }
           $elements['#sorted'] = TRUE;
+        }
         return array_keys($children);
+      }
       /**
        * Returns the visible children of an element.
+       *
        * @param $elements
        *   The parent element.
+       *
        * @return
        *   The array keys of the element's visible children.
        */
       function element_get_visible_children(array $elements) {
         $visible_children = array();
         foreach (element_children($elements) as $key) {
           $child = $elements[$key];
           // Skip un-accessible children.
           if (isset($child['#access']) && !$child['#access']) {
             continue;
+          }
           // Skip value and hidden elements, since they are not rendered.
           if (isset($child['#type']) && in_array($child['#type'], array('value', 'hidden'))) {
             continue;
+          }
           $visible_children[$key] = $child;
+        }
         return array_keys($visible_children);
+      }
       /**
        * Sets HTML attributes based on element properties.
+       *
        * @param $element
        *   The renderable element to process.
        * @param $map
        *   An associative array whose keys are element property names and whose values
        *   are the HTML attribute names to set for corresponding the property; e.g.,
        *   array('#propertyname' => 'attributename'). If both names are identical
        *   except for the leading '#', then an attribute name value is sufficient and
        *   no property name needs to be specified.
        */
       function element_set_attributes(array &$element, array $map) {
         foreach ($map as $property => $attribute) {
           // If the key is numeric, the attribute name needs to be taken over.
           if (is_int($property)) {
             $property = '#' . $attribute;
+          }
           // Do not overwrite already existing attributes.
           if (isset($element[$property]) && !isset($element['#attributes'][$attribute])) {
             $element['#attributes'][$attribute] = $element[$property];
+          }
+        }
+      }
       /**
        * Recursively computes the difference of arrays with additional index check.
+       *
        * This is a version of array_diff_assoc() that supports multidimensional
        * arrays.
+       *
        * @param array $array1
        *   The array to compare from.
        * @param array $array2
        *   The array to compare to.
+       *
        * @return array
        *   Returns an array containing all the values from array1 that are not present
        *   in array2.
        */
       function drupal_array_diff_assoc_recursive($array1, $array2) {
         $difference = array();
         foreach ($array1 as $key => $value) {
           if (is_array($value)) {
             if (!array_key_exists($key, $array2) || !is_array($array2[$key])) {
               $difference[$key] = $value;
+            }
             else {
               $new_diff = drupal_array_diff_assoc_recursive($value, $array2[$key]);
               if (!empty($new_diff)) {
                 $difference[$key] = $new_diff;
+              }
+            }
+          }
           elseif (!array_key_exists($key, $array2) || $array2[$key] !== $value) {
             $difference[$key] = $value;
+          }
+        }
         return $difference;
+      }
       /**
        * Sets a value in a nested array with variable depth.
+       *
        * This helper function should be used when the depth of the array element you
        * are changing may vary (that is, the number of parent keys is variable). It
        * is primarily used for form structures and renderable arrays.
+       *
        * Example:
        * @code
        * // Assume you have a 'signature' element somewhere in a form. It might be:
        * $form['signature_settings']['signature'] = array(
        *   '#type' => 'text_format',
        *   '#title' => t('Signature'),
        * );
        * // Or, it might be further nested:
        * $form['signature_settings']['user']['signature'] = array(
        *   '#type' => 'text_format',
        *   '#title' => t('Signature'),
        * );
        * @endcode
+       *
        * To deal with the situation, the code needs to figure out the route to the
        * element, given an array of parents that is either
        * @code array('signature_settings', 'signature') @endcode in the first case or
        * @code array('signature_settings', 'user', 'signature') @endcode in the second
        * case.
+       *
        * Without this helper function the only way to set the signature element in one
        * line would be using eval(), which should be avoided:
        * @code
        * // Do not do this! Avoid eval().
        * eval('$form[\'' . implode("']['", $parents) . '\'] = $element;');
        * @endcode
+       *
        * Instead, use this helper function:
        * @code
        * drupal_array_set_nested_value($form, $parents, $element);
        * @endcode
+       *
        * However if the number of array parent keys is static, the value should always
        * be set directly rather than calling this function. For instance, for the
        * first example we could just do:
        * @code
        * $form['signature_settings']['signature'] = $element;
        * @endcode
+       *
        * @param $array
        *   A reference to the array to modify.
        * @param $parents
        *   An array of parent keys, starting with the outermost key.
        * @param $value
        *   The value to set.
        * @param $force
        *   (Optional) If TRUE, the value is forced into the structure even if it
        *   requires the deletion of an already existing non-array parent value. If
        *   FALSE, PHP throws an error if trying to add into a value that is not an
        *   array. Defaults to FALSE.
+       *
        * @see drupal_array_get_nested_value()
        */
       function drupal_array_set_nested_value(array &$array, array $parents, $value, $force = FALSE) {
         $ref = &$array;
         foreach ($parents as $parent) {
           // PHP auto-creates container arrays and NULL entries without error if $ref
           // is NULL, but throws an error if $ref is set, but not an array.
           if ($force && isset($ref) && !is_array($ref)) {
             $ref = array();
+          }
           $ref = &$ref[$parent];
+        }
         $ref = $value;
+      }
       /**
        * Retrieves a value from a nested array with variable depth.
+       *
        * This helper function should be used when the depth of the array element being
        * retrieved may vary (that is, the number of parent keys is variable). It is
        * primarily used for form structures and renderable arrays.
+       *
        * Without this helper function the only way to get a nested array value with
        * variable depth in one line would be using eval(), which should be avoided:
        * @code
        * // Do not do this! Avoid eval().
        * // May also throw a PHP notice, if the variable array keys do not exist.
        * eval('$value = $array[\'' . implode("']['", $parents) . "'];");
        * @endcode
+       *
        * Instead, use this helper function:
        * @code
        * $value = drupal_array_get_nested_value($form, $parents);
        * @endcode
+       *
        * A return value of NULL is ambiguous, and can mean either that the requested
        * key does not exist, or that the actual value is NULL. If it is required to
        * know whether the nested array key actually exists, pass a third argument that
        * is altered by reference:
        * @code
        * $key_exists = NULL;
        * $value = drupal_array_get_nested_value($form, $parents, $key_exists);
        * if ($key_exists) {
        *   // ... do something with $value ...
        * }
        * @endcode
+       *
        * However if the number of array parent keys is static, the value should always
        * be retrieved directly rather than calling this function. For instance:
        * @code
        * $value = $form['signature_settings']['signature'];
        * @endcode
+       *
        * @param $array
        *   The array from which to get the value.
        * @param $parents
        *   An array of parent keys of the value, starting with the outermost key.
        * @param $key_exists
        *   (optional) If given, an already defined variable that is altered by
        *   reference.
+       *
        * @return
        *   The requested nested value. Possibly NULL if the value is NULL or not all
        *   nested parent keys exist. $key_exists is altered by reference and is a
        *   Boolean that indicates whether all nested parent keys exist (TRUE) or not
        *   (FALSE). This allows to distinguish between the two possibilities when NULL
        *   is returned.
+       *
        * @see drupal_array_set_nested_value()
        */
       function &drupal_array_get_nested_value(array &$array, array $parents, &$key_exists = NULL) {
         $ref = &$array;
         foreach ($parents as $parent) {
           if (is_array($ref) && array_key_exists($parent, $ref)) {
             $ref = &$ref[$parent];
+          }
           else {
             $key_exists = FALSE;
             $null = NULL;
             return $null;
+          }
+        }
         $key_exists = TRUE;
         return $ref;
+      }
       /**
        * Determines whether a nested array contains the requested keys.
+       *
        * This helper function should be used when the depth of the array element to be
        * checked may vary (that is, the number of parent keys is variable). See
        * drupal_array_set_nested_value() for details. It is primarily used for form
        * structures and renderable arrays.
+       *
        * If it is required to also get the value of the checked nested key, use
        * drupal_array_get_nested_value() instead.
+       *
        * If the number of array parent keys is static, this helper function is
        * unnecessary and the following code can be used instead:
        * @code
        * $value_exists = isset($form['signature_settings']['signature']);
        * $key_exists = array_key_exists('signature', $form['signature_settings']);
        * @endcode
+       *
        * @param $array
        *   The array with the value to check for.
        * @param $parents
        *   An array of parent keys of the value, starting with the outermost key.
+       *
        * @return
        *   TRUE if all the parent keys exist, FALSE otherwise.
+       *
        * @see drupal_array_get_nested_value()
        */
       function drupal_array_nested_key_exists(array $array, array $parents) {
         // Although this function is similar to PHP's array_key_exists(), its
         // arguments should be consistent with drupal_array_get_nested_value().
         $key_exists = NULL;
         drupal_array_get_nested_value($array, $parents, $key_exists);
         return $key_exists;
+      }
       /**
        * Provides theme registration for themes across .inc files.
        */
       function drupal_common_theme() {
         return array(
           // From theme.inc.
           'html' => array(
             'render element' => 'page',
             'template' => 'html',
           ),
           'page' => array(
             'render element' => 'page',
             'template' => 'page',
           ),
           'region' => array(
             'render element' => 'elements',
             'template' => 'region',
           ),
           'status_messages' => array(
             'variables' => array('display' => NULL),
           ),
           'link' => array(
             'variables' => array('text' => NULL, 'path' => NULL, 'options' => array()),
           ),
           'links' => array(
             'variables' => array('links' => NULL, 'attributes' => array('class' => array('links')), 'heading' => array()),
           ),
           'image' => array(
             // HTML 4 and XHTML 1.0 always require an alt attribute. The HTML 5 draft
             // allows the alt attribute to be omitted in some cases. Therefore,
             // default the alt attribute to an empty string, but allow code calling
             // theme('image') to pass explicit NULL for it to be omitted. Usually,
             // neither omission nor an empty string satisfies accessibility
             // requirements, so it is strongly encouraged for code calling
             // theme('image') to pass a meaningful value for the alt variable.
             // - http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
             // - http://www.w3.org/TR/xhtml1/dtds.html
             // - http://dev.w3.org/html5/spec/Overview.html#alt
             // The title attribute is optional in all cases, so it is omitted by
             // default.
             'variables' => array('path' => NULL, 'width' => NULL, 'height' => NULL, 'alt' => '', 'title' => NULL, 'attributes' => array()),
           ),
           'breadcrumb' => array(
             'variables' => array('breadcrumb' => NULL),
           ),
           'help' => array(
             'variables' => array(),
           ),
           'table' => array(
             'variables' => array('header' => NULL, 'rows' => NULL, 'attributes' => array(), 'caption' => NULL, 'colgroups' => array(), 'sticky' => TRUE, 'empty' => ''),
           ),
           'tablesort_indicator' => array(
             'variables' => array('style' => NULL),
           ),
           'mark' => array(
             'variables' => array('type' => MARK_NEW),
           ),
           'item_list' => array(
             'variables' => array('items' => array(), 'title' => NULL, 'type' => 'ul', 'attributes' => array()),
           ),
           'more_help_link' => array(
             'variables' => array('url' => NULL),
           ),
           'feed_icon' => array(
             'variables' => array('url' => NULL, 'title' => NULL),
           ),
           'more_link' => array(
             'variables' => array('url' => NULL, 'title' => NULL)
           ),
           'username' => array(
             'variables' => array('account' => NULL),
           ),
           'progress_bar' => array(
             'variables' => array('percent' => NULL, 'message' => NULL),
           ),
           'indentation' => array(
             'variables' => array('size' => 1),
           ),
           'html_tag' => array(
             'render element' => 'element',
           ),
           // From theme.maintenance.inc.
           'maintenance_page' => array(
             'variables' => array('content' => NULL, 'show_messages' => TRUE),
             'template' => 'maintenance-page',
           ),
           'update_page' => array(
             'variables' => array('content' => NULL, 'show_messages' => TRUE),
           ),
           'install_page' => array(
             'variables' => array('content' => NULL),
           ),
           'task_list' => array(
             'variables' => array('items' => NULL, 'active' => NULL),
           ),
           'authorize_message' => array(
             'variables' => array('message' => NULL, 'success' => TRUE),
           ),
           'authorize_report' => array(
             'variables' => array('messages' => array()),
           ),
           // From pager.inc.
           'pager' => array(
             'variables' => array('tags' => array(), 'element' => 0, 'parameters' => array(), 'quantity' => 9),
           ),
           'pager_first' => array(
             'variables' => array('text' => NULL, 'element' => 0, 'parameters' => array()),
           ),
           'pager_previous' => array(
             'variables' => array('text' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
           ),
           'pager_next' => array(
             'variables' => array('text' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
           ),
           'pager_last' => array(
             'variables' => array('text' => NULL, 'element' => 0, 'parameters' => array()),
           ),
           'pager_link' => array(
             'variables' => array('text' => NULL, 'page_new' => NULL, 'element' => NULL, 'parameters' => array(), 'attributes' => array()),
           ),
           // From menu.inc.
           'menu_link' => array(
             'render element' => 'element',
           ),
           'menu_tree' => array(
             'render element' => 'tree',
           ),
           'menu_local_task' => array(
             'render element' => 'element',
           ),
           'menu_local_action' => array(
             'render element' => 'element',
           ),
           'menu_local_tasks' => array(
             'variables' => array('primary' => array(), 'secondary' => array()),
           ),
           // From form.inc.
           'select' => array(
             'render element' => 'element',
           ),
           'fieldset' => array(
             'render element' => 'element',
           ),
           'radio' => array(
             'render element' => 'element',
           ),
           'radios' => array(
             'render element' => 'element',
           ),
           'date' => array(
             'render element' => 'element',
           ),
           'exposed_filters' => array(
             'render element' => 'form',
           ),
           'checkbox' => array(
             'render element' => 'element',
           ),
           'checkboxes' => array(
             'render element' => 'element',
           ),
           'button' => array(
             'render element' => 'element',
           ),
           'image_button' => array(
             'render element' => 'element',
           ),
           'hidden' => array(
             'render element' => 'element',
           ),
           'textfield' => array(
             'render element' => 'element',
           ),
           'form' => array(
             'render element' => 'element',
           ),
           'textarea' => array(
             'render element' => 'element',
           ),
           'password' => array(
             'render element' => 'element',
           ),
           'file' => array(
             'render element' => 'element',
           ),
           'tableselect' => array(
             'render element' => 'element',
           ),
           'form_element' => array(
             'render element' => 'element',
           ),
           'form_required_marker' => array(
             'render element' => 'element',
           ),
           'form_element_label' => array(
             'render element' => 'element',
           ),
           'vertical_tabs' => array(
             'render element' => 'element',
           ),
           'container' => array(
             'render element' => 'element',
           ),
         );
+      }
       /**
        * @addtogroup schemaapi
        * @{
        */
       /**
        * Creates all tables defined in a module's hook_schema().
+       *
        * Note: This function does not pass the module's schema through
        * hook_schema_alter(). The module's tables will be created exactly as the
        * module defines them.
+       *
        * @param $module
        *   The module for which the tables will be created.
        */
       function drupal_install_schema($module) {
         $schema = drupal_get_schema_unprocessed($module);
         _drupal_schema_initialize($schema, $module, FALSE);
         foreach ($schema as $name => $table) {
           db_create_table($name, $table);
+        }
+      }
       /**
        * Removes all tables defined in a module's hook_schema().
+       *
        * Note: This function does not pass the module's schema through
        * hook_schema_alter(). The module's tables will be created exactly as the
        * module defines them.
+       *
        * @param $module
        *   The module for which the tables will be removed.
+       *
        * @return
        *   An array of arrays with the following key/value pairs:
        *    - success: a boolean indicating whether the query succeeded.
        *    - query: the SQL query(s) executed, passed through check_plain().
        */
       function drupal_uninstall_schema($module) {
         $schema = drupal_get_schema_unprocessed($module);
         _drupal_schema_initialize($schema, $module, FALSE);
         foreach ($schema as $table) {
           if (db_table_exists($table['name'])) {
             db_drop_table($table['name']);
+          }
+        }
+      }
       /**
        * Returns the unprocessed and unaltered version of a module's schema.
+       *
        * Use this function only if you explicitly need the original
        * specification of a schema, as it was defined in a module's
        * hook_schema(). No additional default values will be set,
        * hook_schema_alter() is not invoked and these unprocessed
        * definitions won't be cached. To retrieve the schema after
        * hook_schema_alter() has been invoked use drupal_get_schema().
+       *
        * This function can be used to retrieve a schema specification in
        * hook_schema(), so it allows you to derive your tables from existing
        * specifications.
+       *
        * It is also used by drupal_install_schema() and
        * drupal_uninstall_schema() to ensure that a module's tables are
        * created exactly as specified without any changes introduced by a
        * module that implements hook_schema_alter().
+       *
        * @param $module
        *   The module to which the table belongs.
        * @param $table
        *   The name of the table. If not given, the module's complete schema
        *   is returned.
        */
       function drupal_get_schema_unprocessed($module, $table = NULL) {
         // Load the .install file to get hook_schema.
         module_load_install($module);
         $schema = module_invoke($module, 'schema');
         if (isset($table) && isset($schema[$table])) {
           return $schema[$table];
+        }
         elseif (!empty($schema)) {
           return $schema;
+        }
         return array();
+      }
       /**
        * Fills in required default values for table definitions from hook_schema().
+       *
        * @param $schema
        *   The schema definition array as it was returned by the module's
        *   hook_schema().
        * @param $module
        *   The module for which hook_schema() was invoked.
        * @param $remove_descriptions
        *   (optional) Whether to additionally remove 'description' keys of all tables
        *   and fields to improve performance of serialize() and unserialize().
        *   Defaults to TRUE.
        */
       function _drupal_schema_initialize(&$schema, $module, $remove_descriptions = TRUE) {
         // Set the name and module key for all tables.
         foreach ($schema as $name => &$table) {
           if (empty($table['module'])) {
             $table['module'] = $module;
+          }
           if (!isset($table['name'])) {
             $table['name'] = $name;
+          }
           if ($remove_descriptions) {
             unset($table['description']);
             foreach ($table['fields'] as &$field) {
               unset($field['description']);
+            }
+          }
+        }
+      }
       /**
        * Retrieves the type for every field in a table schema.
+       *
        * @param $table
        *   The name of the table from which to retrieve type information.
+       *
        * @return
        *   An array of types, keyed by field name.
        */
       function drupal_schema_field_types($table) {
         $table_schema = drupal_get_schema($table);
         $field_types = array();
         foreach ($table_schema['fields'] as $field_name => $field_info) {
           $field_types[$field_name] = isset($field_info['type']) ? $field_info['type'] : NULL;
+        }
         return $field_types;
+      }
       /**
        * Retrieves a list of fields from a table schema.
+       *
        * The returned list is suitable for use in an SQL query.
+       *
        * @param $table
        *   The name of the table from which to retrieve fields.
        * @param
        *   An optional prefix to to all fields.
+       *
        * @return An array of fields.
        */
       function drupal_schema_fields_sql($table, $prefix = NULL) {
         $schema = drupal_get_schema($table);
         $fields = array_keys($schema['fields']);
         if ($prefix) {
           $columns = array();
           foreach ($fields as $field) {
             $columns[] = "$prefix.$field";
+          }
           return $columns;
+        }
         else {
           return $fields;
+        }
+      }
       /**
        * Saves (inserts or updates) a record to the database based upon the schema.
+       *
        * Do not use drupal_write_record() within hook_update_N() functions, since the
        * database schema cannot be relied upon when a user is running a series of
        * updates. Instead, use db_insert() or db_update() to save the record.
+       *
        * @param $table
        *   The name of the table; this must be defined by a hook_schema()
        *   implementation.
        * @param $record
        *   An object or array representing the record to write, passed in by
        *   reference. If inserting a new record, values not provided in $record will
        *   be populated in $record and in the database with the default values from
        *   the schema, as well as a single serial (auto-increment) field (if present).
        *   If updating an existing record, only provided values are updated in the
        *   database, and $record is not modified.
        * @param $primary_keys
        *   To indicate that this is a new record to be inserted, omit this argument.
        *   If this is an update, this argument specifies the primary keys' field
        *   names. If there is only 1 field in the key, you may pass in a string; if
        *   there are multiple fields in the key, pass in an array.
+       *
        * @return
        *   If the record insert or update failed, returns FALSE. If it succeeded,
        *   returns SAVED_NEW or SAVED_UPDATED, depending on the operation performed.
        */
       function drupal_write_record($table, &$record, $primary_keys = array()) {
         // Standardize $primary_keys to an array.
         if (is_string($primary_keys)) {
           $primary_keys = array($primary_keys);
+        }
         $schema = drupal_get_schema($table);
         if (empty($schema)) {
           return FALSE;
+        }
         $object = (object) $record;
         $fields = array();
         // Go through the schema to determine fields to write.
         foreach ($schema['fields'] as $field => $info) {
           if ($info['type'] == 'serial') {
             // Skip serial types if we are updating.
             if (!empty($primary_keys)) {
               continue;
+            }
             // Track serial field so we can helpfully populate them after the query.
             // NOTE: Each table should come with one serial field only.
             $serial = $field;
+          }
           // Skip field if it is in $primary_keys as it is unnecessary to update a
           // field to the value it is already set to.
           if (in_array($field, $primary_keys)) {
             continue;
+          }
           if (!property_exists($object, $field)) {
             // Skip fields that are not provided, default values are already known
             // by the database.
             continue;
+          }
           // Build array of fields to update or insert.
           if (empty($info['serialize'])) {
             $fields[$field] = $object->$field;
+          }
           else {
             $fields[$field] = serialize($object->$field);
+          }
           // Type cast to proper datatype, except when the value is NULL and the
           // column allows this.
           //
           // MySQL PDO silently casts e.g. FALSE and '' to 0 when inserting the value
           // into an integer column, but PostgreSQL PDO does not. Also type cast NULL
           // when the column does not allow this.
           if (isset($object->$field) || !empty($info['not null'])) {
             if ($info['type'] == 'int' || $info['type'] == 'serial') {
               $fields[$field] = (int) $fields[$field];
+            }
             elseif ($info['type'] == 'float') {
               $fields[$field] = (float) $fields[$field];
+            }
             else {
               $fields[$field] = (string) $fields[$field];
+            }
+          }
+        }
         if (empty($fields)) {
           return;
+        }
         // Build the SQL.
         if (empty($primary_keys)) {
           // We are doing an insert.
           $options = array('return' => Database::RETURN_INSERT_ID);
           if (isset($serial) && isset($fields[$serial])) {
             // If the serial column has been explicitly set with an ID, then we don't
             // require the database to return the last insert id.
             if ($fields[$serial]) {
               $options['return'] = Database::RETURN_AFFECTED;
+            }
             // If a serial column does exist with no value (i.e. 0) then remove it as
             // the database will insert the correct value for us.
             else {
               unset($fields[$serial]);
+            }
+          }
           $query = db_insert($table, $options)->fields($fields);
           $return = SAVED_NEW;
+        }
         else {
           $query = db_update($table)->fields($fields);
           foreach ($primary_keys as $key) {
             $query->condition($key, $object->$key);
+          }
           $return = SAVED_UPDATED;
+        }
         // Execute the SQL.
         if ($query_return = $query->execute()) {
           if (isset($serial)) {
             // If the database was not told to return the last insert id, it will be
             // because we already know it.
             if (isset($options) && $options['return'] != Database::RETURN_INSERT_ID) {
               $object->$serial = $fields[$serial];
+            }
             else {
               $object->$serial = $query_return;
+            }
+          }
+        }
         // If we have a single-field primary key but got no insert ID, the
         // query failed. Note that we explicitly check for FALSE, because
         // a valid update query which doesn't change any values will return
         // zero (0) affected rows.
         elseif ($query_return === FALSE && count($primary_keys) == 1) {
           $return = FALSE;
+        }
         // If we are inserting, populate empty fields with default values.
         if (empty($primary_keys)) {
           foreach ($schema['fields'] as $field => $info) {
             if (isset($info['default']) && !property_exists($object, $field)) {
               $object->$field = $info['default'];
+            }
+          }
+        }
         // If we began with an array, convert back.
         if (is_array($record)) {
           $record = (array) $object;
+        }
         return $return;
+      }
       /**
        * @} End of "addtogroup schemaapi".
        */
       /**
        * Parses Drupal module and theme .info files.
+       *
        * Info files are NOT for placing arbitrary theme and module-specific settings.
        * Use variable_get() and variable_set() for that.
+       *
        * Information stored in a module .info file:
        * - name: The real name of the module for display purposes.
        * - description: A brief description of the module.
        * - dependencies: An array of dependency strings. Each is in the form
        *   'project:module (versions)'; with the following meanings:
        *   - project: (optional) Project shortname, recommended to ensure uniqueness,
        *     if the module is part of a project hosted on drupal.org. If omitted,
        *     also omit the : that follows. The project name is currently ignored by
        *     Drupal core but is used for automated testing.
        *   - module: (required) Module shortname within the project.
        *   - (versions): Optional version information, consisting of one or more
        *     comma-separated operator/value pairs or simply version numbers, which
        *     can contain "x" as a wildcard. Examples: (>=7.22, <7.28), (7.x-3.x).
        * - package: The name of the package of modules this module belongs to.
+       *
        * See forum.info for an example of a module .info file.
+       *
        * Information stored in a theme .info file:
        * - name: The real name of the theme for display purposes.
        * - description: Brief description.
        * - screenshot: Path to screenshot relative to the theme's .info file.
        * - engine: Theme engine; typically phptemplate.
        * - base: Name of a base theme, if applicable; e.g., base = zen.
        * - regions: Listed regions; e.g., region[left] = Left sidebar.
        * - features: Features available; e.g., features[] = logo.
        * - stylesheets: Theme stylesheets; e.g., stylesheets[all][] = my-style.css.
        * - scripts: Theme scripts; e.g., scripts[] = my-script.js.
+       *
        * See bartik.info for an example of a theme .info file.
+       *
        * @param $filename
        *   The file we are parsing. Accepts file with relative or absolute path.
+       *
        * @return
        *   The info array.
+       *
        * @see drupal_parse_info_format()
        */
       function drupal_parse_info_file($filename) {
         $info = &drupal_static(__FUNCTION__, array());
         if (!isset($info[$filename])) {
           if (!file_exists($filename)) {
             $info[$filename] = array();
+          }
           else {
             $data = file_get_contents($filename);
             $info[$filename] = drupal_parse_info_format($data);
+          }
+        }
         return $info[$filename];
+      }
       /**
        * Parses data in Drupal's .info format.
+       *
        * Data should be in an .ini-like format to specify values. White-space
        * generally doesn't matter, except inside values:
        * @code
        *   key = value
        *   key = "value"
        *   key = 'value'
        *   key = "multi-line
        *   value"
        *   key = 'multi-line
        *   value'
        *   key
        *   =
        *   'value'
        * @endcode
+       *
        * Arrays are created using a HTTP GET alike syntax:
        * @code
        *   key[] = "numeric array"
        *   key[index] = "associative array"
        *   key[index][] = "nested numeric array"
        *   key[index][index] = "nested associative array"
        * @endcode
+       *
        * PHP constants are substituted in, but only when used as the entire value.
        * Comments should start with a semi-colon at the beginning of a line.
+       *
        * @param $data
        *   A string to parse.
+       *
        * @return
        *   The info array.
+       *
        * @see drupal_parse_info_file()
        */
       function drupal_parse_info_format($data) {
         $info = array();
         if (preg_match_all('
           @^\s*                           # Start at the beginning of a line, ignoring leading whitespace
           ((?:
             [^=;\[\]]|                    # Key names cannot contain equal signs, semi-colons or square brackets,
             \[[^\[\]]*\]                  # unless they are balanced and not nested
           )+?)
           \s*=\s*                         # Key/value pairs are separated by equal signs (ignoring white-space)
           (?:
             ("(?:[^"]|(?<=\\\\)")*")|     # Double-quoted string, which may contain slash-escaped quotes/slashes
             (\'(?:[^\']|(?<=\\\\)\')*\')| # Single-quoted string, which may contain slash-escaped quotes/slashes
             ([^\r\n]*?)                   # Non-quoted string
           )\s*$                           # Stop at the next end of a line, ignoring trailing whitespace
           @msx', $data, $matches, PREG_SET_ORDER)) {
           foreach ($matches as $match) {
             // Fetch the key and value string.
             $i = 0;
             foreach (array('key', 'value1', 'value2', 'value3') as $var) {
               $$var = isset($match[++$i]) ? $match[$i] : '';
+            }
             $value = stripslashes(substr($value1, 1, -1)) . stripslashes(substr($value2, 1, -1)) . $value3;
             // Parse array syntax.
             $keys = preg_split('/\]?\[/', rtrim($key, ']'));
             $last = array_pop($keys);
             $parent = &$info;
             // Create nested arrays.
             foreach ($keys as $key) {
               if ($key == '') {
                 $key = count($parent);
+              }
               if (!isset($parent[$key]) || !is_array($parent[$key])) {
                 $parent[$key] = array();
+              }
               $parent = &$parent[$key];
+            }
             // Handle PHP constants.
             if (preg_match('/^\w+$/i', $value) && defined($value)) {
               $value = constant($value);
+            }
             // Insert actual value.
             if ($last == '') {
               $last = count($parent);
+            }
             $parent[$last] = $value;
+          }
+        }
         return $info;
+      }
       /**
        * Returns a list of severity levels, as defined in RFC 3164.
+       *
        * @return
        *   Array of the possible severity levels for log messages.
+       *
        * @see http://www.ietf.org/rfc/rfc3164.txt
        * @see watchdog()
        * @ingroup logging_severity_levels
        */
       function watchdog_severity_levels() {
         return array(
           WATCHDOG_EMERGENCY => t('emergency'),
           WATCHDOG_ALERT     => t('alert'),
           WATCHDOG_CRITICAL  => t('critical'),
           WATCHDOG_ERROR     => t('error'),
           WATCHDOG_WARNING   => t('warning'),
           WATCHDOG_NOTICE    => t('notice'),
           WATCHDOG_INFO      => t('info'),
           WATCHDOG_DEBUG     => t('debug'),
         );
+      }
       /**
        * Explodes a string of tags into an array.
+       *
        * @see drupal_implode_tags()
        */
       function drupal_explode_tags($tags) {
         // This regexp allows the following types of user input:
         // this, "somecompany, llc", "and ""this"" w,o.rks", foo bar
         $regexp = '%(?:^|,\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
         preg_match_all($regexp, $tags, $matches);
         $typed_tags = array_unique($matches[1]);
         $tags = array();
         foreach ($typed_tags as $tag) {
           // If a user has escaped a term (to demonstrate that it is a group,
           // or includes a comma or quote character), we remove the escape
           // formatting so to save the term into the database as the user intends.
           $tag = trim(str_replace('""', '"', preg_replace('/^"(.*)"$/', '\1', $tag)));
           if ($tag != "") {
             $tags[] = $tag;
+          }
+        }
         return $tags;
+      }
       /**
        * Implodes an array of tags into a string.
+       *
        * @see drupal_explode_tags()
        */
       function drupal_implode_tags($tags) {
         $encoded_tags = array();
         foreach ($tags as $tag) {
           // Commas and quotes in tag names are special cases, so encode them.
           if (strpos($tag, ',') !== FALSE || strpos($tag, '"') !== FALSE) {
             $tag = '"' . str_replace('"', '""', $tag) . '"';
+          }
           $encoded_tags[] = $tag;
+        }
         return implode(', ', $encoded_tags);
+      }
       /**
        * Flushes all cached data on the site.
+       *
        * Empties cache tables, rebuilds the menu cache and theme registries, and
        * invokes a hook so that other modules' cache data can be cleared as well.
        */
       function drupal_flush_all_caches() {
         // Change query-strings on css/js files to enforce reload for all users.
         _drupal_flush_css_js();
         registry_rebuild();
         drupal_clear_css_cache();
         drupal_clear_js_cache();
         // Rebuild the theme data. Note that the module data is rebuilt above, as
         // part of registry_rebuild().
         system_rebuild_theme_data();
         drupal_theme_rebuild();
         entity_info_cache_clear();
         node_types_rebuild();
         // node_menu() defines menu items based on node types so it needs to come
         // after node types are rebuilt.
         menu_rebuild();
         // Synchronize to catch any actions that were added or removed.
         actions_synchronize();
         // Don't clear cache_form - in-progress form submissions may break.
         // Ordered so clearing the page cache will always be the last action.
         $core = array('cache', 'cache_path', 'cache_filter', 'cache_bootstrap', 'cache_page');
         $cache_tables = array_merge(module_invoke_all('flush_caches'), $core);
         foreach ($cache_tables as $table) {
           cache_clear_all('*', $table, TRUE);
+        }
         // Rebuild the bootstrap module list. We do this here so that developers
         // can get new hook_boot() implementations registered without having to
         // write a hook_update_N() function.
         _system_update_bootstrap_status();
+      }
       /**
        * Changes the dummy query string added to all CSS and JavaScript files.
+       *
        * Changing the dummy query string appended to CSS and JavaScript files forces
        * all browsers to reload fresh files.
        */
       function _drupal_flush_css_js() {
         // The timestamp is converted to base 36 in order to make it more compact.
         variable_set('css_js_query_string', base_convert(REQUEST_TIME, 10, 36));
+      }
       /**
        * Outputs debug information.
+       *
        * The debug information is passed on to trigger_error() after being converted
        * to a string using _drupal_debug_message().
+       *
        * @param $data
        *   Data to be output.
        * @param $label
        *   Label to prefix the data.
        * @param $print_r
        *   Flag to switch between print_r() and var_export() for data conversion to
        *   string. Set $print_r to TRUE when dealing with a recursive data structure
        *   as var_export() will generate an error.
        */
       function debug($data, $label = NULL, $print_r = FALSE) {
         // Print $data contents to string.
         $string = check_plain($print_r ? print_r($data, TRUE) : var_export($data, TRUE));
         // Display values with pre-formatting to increase readability.
         $string = '<pre>' . $string . '</pre>';
         trigger_error(trim($label ? "$label: $string" : $string));
+      }
       /**
        * Parses a dependency for comparison by drupal_check_incompatibility().
+       *
        * @param $dependency
        *   A dependency string, which specifies a module dependency, and optionally
        *   the project it comes from and versions that are supported. Supported
        *   formats include:
        *   - 'module'
        *   - 'project:module'
        *   - 'project:module (>=version, version)'
+       *
        * @return
        *   An associative array with three keys:
        *   - 'name' includes the name of the thing to depend on (e.g. 'foo').
        *   - 'original_version' contains the original version string (which can be
        *     used in the UI for reporting incompatibilities).
        *   - 'versions' is a list of associative arrays, each containing the keys
        *     'op' and 'version'. 'op' can be one of: '=', '==', '!=', '<>', '<',
        *     '<=', '>', or '>='. 'version' is one piece like '4.5-beta3'.
        *   Callers should pass this structure to drupal_check_incompatibility().
+       *
        * @see drupal_check_incompatibility()
        */
       function drupal_parse_dependency($dependency) {
         $value = array();
         // Split out the optional project name.
         if (strpos($dependency, ':')) {
           list($project_name, $dependency) = explode(':', $dependency);
           $value['project'] = $project_name;
+        }
         // We use named subpatterns and support every op that version_compare
         // supports. Also, op is optional and defaults to equals.
         $p_op = '(?P<operation>!=|==|=|<|<=|>|>=|<>)?';
         // Core version is always optional: 7.x-2.x and 2.x is treated the same.
         $p_core = '(?:' . preg_quote(DRUPAL_CORE_COMPATIBILITY) . '-)?';
         $p_major = '(?P<major>\d+)';
         // By setting the minor version to x, branches can be matched.
         $p_minor = '(?P<minor>(?:\d+|x)(?:-[A-Za-z]+\d+)?)';
         $parts = explode('(', $dependency, 2);
         $value['name'] = trim($parts[0]);
         if (isset($parts[1])) {
           $value['original_version'] = ' (' . $parts[1];
           foreach (explode(',', $parts[1]) as $version) {
             if (preg_match("/^\s*$p_op\s*$p_core$p_major\.$p_minor/", $version, $matches)) {
               $op = !empty($matches['operation']) ? $matches['operation'] : '=';
               if ($matches['minor'] == 'x') {
                 // Drupal considers "2.x" to mean any version that begins with
                 // "2" (e.g. 2.0, 2.9 are all "2.x"). PHP's version_compare(),
                 // on the other hand, treats "x" as a string; so to
                 // version_compare(), "2.x" is considered less than 2.0. This
                 // means that >=2.x and <2.x are handled by version_compare()
                 // as we need, but > and <= are not.
                 if ($op == '>' || $op == '<=') {
                   $matches['major']++;
+                }
                 // Equivalence can be checked by adding two restrictions.
                 if ($op == '=' || $op == '==') {
                   $value['versions'][] = array('op' => '<', 'version' => ($matches['major'] + 1) . '.x');
                   $op = '>=';
+                }
+              }
               $value['versions'][] = array('op' => $op, 'version' => $matches['major'] . '.' . $matches['minor']);
+            }
+          }
+        }
         return $value;
+      }
       /**
        * Checks whether a version is compatible with a given dependency.
+       *
        * @param $v
        *   The parsed dependency structure from drupal_parse_dependency().
        * @param $current_version
        *   The version to check against (like 4.2).
+       *
        * @return
        *   NULL if compatible, otherwise the original dependency version string that
        *   caused the incompatibility.
+       *
        * @see drupal_parse_dependency()
        */
       function drupal_check_incompatibility($v, $current_version) {
         if (!empty($v['versions'])) {
           foreach ($v['versions'] as $required_version) {
             if ((isset($required_version['op']) && !version_compare($current_version, $required_version['version'], $required_version['op']))) {
               return $v['original_version'];
+            }
+          }
+        }
+      }
       /**
        * Get the entity info array of an entity type.
+       *
        * @param $entity_type
        *   The entity type, e.g. node, for which the info shall be returned, or NULL
        *   to return an array with info about all types.
+       *
        * @see hook_entity_info()
        * @see hook_entity_info_alter()
        */
       function entity_get_info($entity_type = NULL) {
         global $language;
         // Use the advanced drupal_static() pattern, since this is called very often.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast)) {
           $drupal_static_fast['entity_info'] = &drupal_static(__FUNCTION__);
+        }
         $entity_info = &$drupal_static_fast['entity_info'];
         // hook_entity_info() includes translated strings, so each language is cached
         // separately.
         $langcode = $language->language;
         if (empty($entity_info)) {
           if ($cache = cache_get("entity_info:$langcode")) {
             $entity_info = $cache->data;
+          }
           else {
             $entity_info = module_invoke_all('entity_info');
             // Merge in default values.
             foreach ($entity_info as $name => $data) {
               $entity_info[$name] += array(
                 'fieldable' => FALSE,
                 'controller class' => 'DrupalDefaultEntityController',
                 'static cache' => TRUE,
                 'field cache' => TRUE,
                 'load hook' => $name . '_load',
                 'bundles' => array(),
                 'view modes' => array(),
                 'entity keys' => array(),
                 'translation' => array(),
               );
               $entity_info[$name]['entity keys'] += array(
                 'revision' => '',
                 'bundle' => '',
               );
               foreach ($entity_info[$name]['view modes'] as $view_mode => $view_mode_info) {
                 $entity_info[$name]['view modes'][$view_mode] += array(
                   'custom settings' => FALSE,
                 );
+              }
               // If no bundle key is provided, assume a single bundle, named after
               // the entity type.
               if (empty($entity_info[$name]['entity keys']['bundle']) && empty($entity_info[$name]['bundles'])) {
                 $entity_info[$name]['bundles'] = array($name => array('label' => $entity_info[$name]['label']));
+              }
               // Prepare entity schema fields SQL info for
               // DrupalEntityControllerInterface::buildQuery().
               if (isset($entity_info[$name]['base table'])) {
                 $entity_info[$name]['base table field types'] = drupal_schema_field_types($entity_info[$name]['base table']);
                 $entity_info[$name]['schema_fields_sql']['base table'] = drupal_schema_fields_sql($entity_info[$name]['base table']);
                 if (isset($entity_info[$name]['revision table'])) {
                   $entity_info[$name]['schema_fields_sql']['revision table'] = drupal_schema_fields_sql($entity_info[$name]['revision table']);
+                }
+              }
+            }
             // Let other modules alter the entity info.
             drupal_alter('entity_info', $entity_info);
             cache_set("entity_info:$langcode", $entity_info);
+          }
+        }
         if (empty($entity_type)) {
           return $entity_info;
+        }
         elseif (isset($entity_info[$entity_type])) {
           return $entity_info[$entity_type];
+        }
+      }
       /**
        * Resets the cached information about entity types.
        */
       function entity_info_cache_clear() {
         drupal_static_reset('entity_get_info');
         // Clear all languages.
         cache_clear_all('entity_info:', 'cache', TRUE);
+      }
       /**
        * Helper function to extract id, vid, and bundle name from an entity.
+       *
        * @param $entity_type
        *   The entity type; e.g. 'node' or 'user'.
        * @param $entity
        *   The entity from which to extract values.
+       *
        * @return
        *   A numerically indexed array (not a hash table) containing these
        *   elements:
        *   - 0: Primary ID of the entity.
        *   - 1: Revision ID of the entity, or NULL if $entity_type is not versioned.
        *   - 2: Bundle name of the entity, or NULL if $entity_type has no bundles.
        */
       function entity_extract_ids($entity_type, $entity) {
         $info = entity_get_info($entity_type);
         // Objects being created might not have id/vid yet.
         $id = isset($entity->{$info['entity keys']['id']}) ? $entity->{$info['entity keys']['id']} : NULL;
         $vid = ($info['entity keys']['revision'] && isset($entity->{$info['entity keys']['revision']})) ? $entity->{$info['entity keys']['revision']} : NULL;
         if (!empty($info['entity keys']['bundle'])) {
           // Explicitly fail for malformed entities missing the bundle property.
           if (!isset($entity->{$info['entity keys']['bundle']}) || $entity->{$info['entity keys']['bundle']} === '') {
             throw new EntityMalformedException(t('Missing bundle property on entity of type @entity_type.', array('@entity_type' => $entity_type)));
+          }
           $bundle = $entity->{$info['entity keys']['bundle']};
+        }
         else {
           // The entity type provides no bundle key: assume a single bundle, named
           // after the entity type.
           $bundle = $entity_type;
+        }
         return array($id, $vid, $bundle);
+      }
       /**
        * Helper function to assemble an object structure with initial ids.
+       *
        * This function can be seen as reciprocal to entity_extract_ids().
+       *
        * @param $entity_type
        *   The entity type; e.g. 'node' or 'user'.
        * @param $ids
        *   A numerically indexed array, as returned by entity_extract_ids().
+       *
        * @return
        *   An entity structure, initialized with the ids provided.
+       *
        * @see entity_extract_ids()
        */
       function entity_create_stub_entity($entity_type, $ids) {
         $entity = new stdClass();
         $info = entity_get_info($entity_type);
         $entity->{$info['entity keys']['id']} = $ids[0];
         if (!empty($info['entity keys']['revision']) && isset($ids[1])) {
           $entity->{$info['entity keys']['revision']} = $ids[1];
+        }
         if (!empty($info['entity keys']['bundle']) && isset($ids[2])) {
           $entity->{$info['entity keys']['bundle']} = $ids[2];
+        }
         return $entity;
+      }
       /**
        * Load entities from the database.
+       *
        * The entities are stored in a static memory cache, and will not require
        * database access if loaded again during the same page request.
+       *
        * The actual loading is done through a class that has to implement the
        * DrupalEntityControllerInterface interface. By default,
        * DrupalDefaultEntityController is used. Entity types can specify that a
        * different class should be used by setting the 'controller class' key in
        * hook_entity_info(). These classes can either implement the
        * DrupalEntityControllerInterface interface, or, most commonly, extend the
        * DrupalDefaultEntityController class. See node_entity_info() and the
        * NodeController in node.module as an example.
+       *
        * @param $entity_type
        *   The entity type to load, e.g. node or user.
        * @param $ids
        *   An array of entity IDs, or FALSE to load all entities.
        * @param $conditions
        *   (deprecated) An associative array of conditions on the base table, where
        *   the keys are the database fields and the values are the values those
        *   fields must have. Instead, it is preferable to use EntityFieldQuery to
        *   retrieve a list of entity IDs loadable by this function.
        * @param $reset
        *   Whether to reset the internal cache for the requested entity type.
+       *
        * @return
        *   An array of entity objects indexed by their ids. When no results are
        *   found, an empty array is returned.
+       *
        * @todo Remove $conditions in Drupal 8.
+       *
        * @see hook_entity_info()
        * @see DrupalEntityControllerInterface
        * @see DrupalDefaultEntityController
        * @see EntityFieldQuery
        */
       function entity_load($entity_type, $ids = FALSE, $conditions = array(), $reset = FALSE) {
         if ($reset) {
           entity_get_controller($entity_type)->resetCache();
+        }
         return entity_get_controller($entity_type)->load($ids, $conditions);
+      }
       /**
        * Loads the unchanged, i.e. not modified, entity from the database.
+       *
        * Unlike entity_load() this function ensures the entity is directly loaded from
        * the database, thus bypassing any static cache. In particular, this function
        * is useful to determine changes by comparing the entity being saved to the
        * stored entity.
+       *
        * @param $entity_type
        *   The entity type to load, e.g. node or user.
        * @param $id
        *   The ID of the entity to load.
+       *
        * @return
        *   The unchanged entity, or FALSE if the entity cannot be loaded.
        */
       function entity_load_unchanged($entity_type, $id) {
         entity_get_controller($entity_type)->resetCache(array($id));
         $result = entity_get_controller($entity_type)->load(array($id));
         return reset($result);
+      }
       /**
        * Gets the entity controller for an entity type.
+       *
        * @return DrupalEntityControllerInterface
        *   The entity controller object for the specified entity type.
        */
       function entity_get_controller($entity_type) {
         $controllers = &drupal_static(__FUNCTION__, array());
         if (!isset($controllers[$entity_type])) {
           $type_info = entity_get_info($entity_type);
           $class = $type_info['controller class'];
           $controllers[$entity_type] = new $class($entity_type);
+        }
         return $controllers[$entity_type];
+      }
       /**
        * Invoke hook_entity_prepare_view().
+       *
        * If adding a new entity similar to nodes, comments or users, you should
        * invoke this function during the ENTITY_build_content() or
        * ENTITY_view_multiple() phases of rendering to allow other modules to alter
        * the objects during this phase. This is needed for situations where
        * information needs to be loaded outside of ENTITY_load() - particularly
        * when loading entities into one another - i.e. a user object into a node, due
        * to the potential for unwanted side-effects such as caching and infinite
        * recursion. By convention, entity_prepare_view() is called after
        * field_attach_prepare_view() to allow entity level hooks to act on content
        * loaded by field API.
+       *
        * @param $entity_type
        *   The type of entity, i.e. 'node', 'user'.
        * @param $entities
        *   The entity objects which are being prepared for view, keyed by object ID.
        * @param $langcode
        *   (optional) A language code to be used for rendering. Defaults to the global
        *   content language of the current request.
+       *
        * @see hook_entity_prepare_view()
        */
       function entity_prepare_view($entity_type, $entities, $langcode = NULL) {
         if (!isset($langcode)) {
           $langcode = $GLOBALS['language_content']->language;
+        }
         // To ensure hooks are only run once per entity, check for an
         // entity_view_prepared flag and only process items without it.
         // @todo: resolve this more generally for both entity and field level hooks.
         $prepare = array();
         foreach ($entities as $id => $entity) {
           if (empty($entity->entity_view_prepared)) {
             // Add this entity to the items to be prepared.
             $prepare[$id] = $entity;
             // Mark this item as prepared.
             $entity->entity_view_prepared = TRUE;
+          }
+        }
         if (!empty($prepare)) {
           module_invoke_all('entity_prepare_view', $prepare, $entity_type, $langcode);
+        }
+      }
       /**
        * Invoke hook_entity_view_mode_alter().
+       *
        * If adding a new entity similar to nodes, comments or users, you should invoke
        * this function during the ENTITY_build_content() or ENTITY_view_multiple()
        * phases of rendering to allow other modules to alter the view mode during this
        * phase. This function needs to be called before field_attach_prepare_view() to
        * ensure that the correct content is loaded by field API.
+       *
        * @param $entity_type
        *   The type of entity, i.e. 'node', 'user'.
        * @param $entities
        *   The entity objects which are being prepared for view, keyed by object ID.
        * @param $view_mode
        *   The original view mode e.g. 'full', 'teaser'...
        * @param $langcode
        *   (optional) A language code to be used for rendering. Defaults to the global
        *   content language of the current request.
        * @return
        *   An associative array with arrays of entities keyed by view mode.
+       *
        * @see hook_entity_view_mode_alter()
        */
       function entity_view_mode_prepare($entity_type, $entities, $view_mode, $langcode = NULL) {
         if (!isset($langcode)) {
           $langcode = $GLOBALS['language_content']->language;
+        }
         // To ensure hooks are never run after field_attach_prepare_view() only
         // process items without the entity_view_prepared flag.
         $entities_by_view_mode = array();
         foreach ($entities as $id => $entity) {
           $entity_view_mode = $view_mode;
           if (empty($entity->entity_view_prepared)) {
             // Allow modules to change the view mode.
             $context = array(
               'entity_type' => $entity_type,
               'entity' => $entity,
               'langcode' => $langcode,
             );
             drupal_alter('entity_view_mode', $entity_view_mode, $context);
+          }
           $entities_by_view_mode[$entity_view_mode][$id] = $entity;
+        }
         return $entities_by_view_mode;
+      }
       /**
        * Returns the URI elements of an entity.
+       *
        * @param $entity_type
        *   The entity type; e.g. 'node' or 'user'.
        * @param $entity
        *   The entity for which to generate a path.
        * @return
        *   An array containing the 'path' and 'options' keys used to build the URI of
        *   the entity, and matching the signature of url(). NULL if the entity has no
        *   URI of its own.
        */
       function entity_uri($entity_type, $entity) {
         $info = entity_get_info($entity_type);
         list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
         // A bundle-specific callback takes precedence over the generic one for the
         // entity type.
         if (isset($info['bundles'][$bundle]['uri callback'])) {
           $uri_callback = $info['bundles'][$bundle]['uri callback'];
+        }
         elseif (isset($info['uri callback'])) {
           $uri_callback = $info['uri callback'];
+        }
         else {
           return NULL;
+        }
         // Invoke the callback to get the URI. If there is no callback, return NULL.
         if (isset($uri_callback) && function_exists($uri_callback)) {
           $uri = $uri_callback($entity);
           // Pass the entity data to url() so that alter functions do not need to
           // lookup this entity again.
           $uri['options']['entity_type'] = $entity_type;
           $uri['options']['entity'] = $entity;
           return $uri;
+        }
+      }
       /**
        * Returns the label of an entity.
+       *
        * See the 'label callback' component of the hook_entity_info() return value
        * for more information.
+       *
        * @param $entity_type
        *   The entity type; e.g., 'node' or 'user'.
        * @param $entity
        *   The entity for which to generate the label.
+       *
        * @return
        *   The entity label, or FALSE if not found.
        */
       function entity_label($entity_type, $entity) {
         $label = FALSE;
         $info = entity_get_info($entity_type);
         if (isset($info['label callback']) && function_exists($info['label callback'])) {
           $label = $info['label callback']($entity, $entity_type);
+        }
         elseif (!empty($info['entity keys']['label']) && isset($entity->{$info['entity keys']['label']})) {
           $label = $entity->{$info['entity keys']['label']};
+        }
         return $label;
+      }
       /**
        * Returns the language of an entity.
+       *
        * @param $entity_type
        *   The entity type; e.g., 'node' or 'user'.
        * @param $entity
        *   The entity for which to get the language.
+       *
        * @return
        *   A valid language code or NULL if the entity has no language support.
        */
       function entity_language($entity_type, $entity) {
         $info = entity_get_info($entity_type);
         // Invoke the callback to get the language. If there is no callback, try to
         // get it from a property of the entity, otherwise NULL.
         if (isset($info['language callback']) && function_exists($info['language callback'])) {
           $langcode = $info['language callback']($entity_type, $entity);
+        }
         elseif (!empty($info['entity keys']['language']) && isset($entity->{$info['entity keys']['language']})) {
           $langcode = $entity->{$info['entity keys']['language']};
+        }
         else {
           // The value returned in D8 would be LANGUAGE_NONE, we cannot use it here to
           // preserve backward compatibility. In fact this function has been
           // introduced very late in the D7 life cycle, mainly as the proper default
           // for field_attach_form(). By returning LANGUAGE_NONE when no language
           // information is available, we would introduce a potentially BC-breaking
           // API change, since field_attach_form() defaults to the default language
           // instead of LANGUAGE_NONE. Moreover this allows us to distinguish between
           // entities that have no language specified from ones that do not have
           // language support at all.
           $langcode = NULL;
+        }
         return $langcode;
+      }
       /**
        * Attaches field API validation to entity forms.
        */
       function entity_form_field_validate($entity_type, $form, &$form_state) {
         // All field attach API functions act on an entity object, but during form
         // validation, we don't have one. $form_state contains the entity as it was
         // prior to processing the current form submission, and we must not update it
         // until we have fully validated the submitted input. Therefore, for
         // validation, act on a pseudo entity created out of the form values.
         $pseudo_entity = (object) $form_state['values'];
         field_attach_form_validate($entity_type, $pseudo_entity, $form, $form_state);
+      }
       /**
        * Copies submitted values to entity properties for simple entity forms.
+       *
        * During the submission handling of an entity form's "Save", "Preview", and
        * possibly other buttons, the form state's entity needs to be updated with the
        * submitted form values. Each entity form implements its own builder function
        * for doing this, appropriate for the particular entity and form, whereas
        * modules may specify additional builder functions in $form['#entity_builders']
        * for copying the form values of added form elements to entity properties.
        * Many of the main entity builder functions can call this helper function to
        * re-use its logic of copying $form_state['values'][PROPERTY] values to
        * $entity->PROPERTY for all entries in $form_state['values'] that are not field
        * data, and calling field_attach_submit() to copy field data. Apart from that
        * this helper invokes any additional builder functions that have been specified
        * in $form['#entity_builders'].
+       *
        * For some entity forms (e.g., forms with complex non-field data and forms that
        * simultaneously edit multiple entities), this behavior may be inappropriate,
        * so the builder function for such forms needs to implement the required
        * functionality instead of calling this function.
        */
       function entity_form_submit_build_entity($entity_type, $entity, $form, &$form_state) {
         $info = entity_get_info($entity_type);
         list(, , $bundle) = entity_extract_ids($entity_type, $entity);
         // Copy top-level form values that are not for fields to entity properties,
         // without changing existing entity properties that are not being edited by
         // this form. Copying field values must be done using field_attach_submit().
         $values_excluding_fields = $info['fieldable'] ? array_diff_key($form_state['values'], field_info_instances($entity_type, $bundle)) : $form_state['values'];
         foreach ($values_excluding_fields as $key => $value) {
           $entity->$key = $value;
+        }
         // Invoke all specified builders for copying form values to entity properties.
         if (isset($form['#entity_builders'])) {
           foreach ($form['#entity_builders'] as $function) {
             $function($entity_type, $entity, $form, $form_state);
+          }
+        }
         // Copy field values to the entity.
         if ($info['fieldable']) {
           field_attach_submit($entity_type, $entity, $form, $form_state);
+        }
+      }
       /**
        * Performs one or more XML-RPC request(s).
+       *
        * Usage example:
        * @code
        * $result = xmlrpc('http://example.com/xmlrpc.php', array(
        *   'service.methodName' => array($parameter, $second, $third),
        * ));
        * @endcode
+       *
        * @param $url
        *   An absolute URL of the XML-RPC endpoint.
        * @param $args
        *   An associative array whose keys are the methods to call and whose values
        *   are the arguments to pass to the respective method. If multiple methods
        *   are specified, a system.multicall is performed.
        * @param $options
        *   (optional) An array of options to pass along to drupal_http_request().
+       *
        * @return
        *   For one request:
        *     Either the return value of the method on success, or FALSE.
        *     If FALSE is returned, see xmlrpc_errno() and xmlrpc_error_msg().
        *   For multiple requests:
        *     An array of results. Each result will either be the result
        *     returned by the method called, or an xmlrpc_error object if the call
        *     failed. See xmlrpc_error().
        */
       function xmlrpc($url, $args, $options = array()) {
         require_once DRUPAL_ROOT . '/includes/xmlrpc.inc';
         return _xmlrpc($url, $args, $options);
+      }
       /**
        * Retrieves a list of all available archivers.
+       *
        * @see hook_archiver_info()
        * @see hook_archiver_info_alter()
        */
       function archiver_get_info() {
         $archiver_info = &drupal_static(__FUNCTION__, array());
         if (empty($archiver_info)) {
           $cache = cache_get('archiver_info');
           if ($cache === FALSE) {
             // Rebuild the cache and save it.
             $archiver_info = module_invoke_all('archiver_info');
             drupal_alter('archiver_info', $archiver_info);
             uasort($archiver_info, 'drupal_sort_weight');
             cache_set('archiver_info', $archiver_info);
+          }
           else {
             $archiver_info = $cache->data;
+          }
+        }
         return $archiver_info;
+      }
       /**
        * Returns a string of supported archive extensions.
+       *
        * @return
        *   A space-separated string of extensions suitable for use by the file
        *   validation system.
        */
       function archiver_get_extensions() {
         $valid_extensions = array();
         foreach (archiver_get_info() as $archive) {
           foreach ($archive['extensions'] as $extension) {
             foreach (explode('.', $extension) as $part) {
               if (!in_array($part, $valid_extensions)) {
                 $valid_extensions[] = $part;
+              }
+            }
+          }
+        }
         return implode(' ', $valid_extensions);
+      }
       /**
        * Creates the appropriate archiver for the specified file.
+       *
        * @param $file
        *   The full path of the archive file. Note that stream wrapper paths are
        *   supported, but not remote ones.
+       *
        * @return
        *   A newly created instance of the archiver class appropriate
        *   for the specified file, already bound to that file.
        *   If no appropriate archiver class was found, will return FALSE.
        */
       function archiver_get_archiver($file) {
         // Archivers can only work on local paths
         $filepath = drupal_realpath($file);
         if (!is_file($filepath)) {
           throw new Exception(t('Archivers can only operate on local files: %file not supported', array('%file' => $file)));
+        }
         $archiver_info = archiver_get_info();
         foreach ($archiver_info as $implementation) {
           foreach ($implementation['extensions'] as $extension) {
             // Because extensions may be multi-part, such as .tar.gz,
             // we cannot use simpler approaches like substr() or pathinfo().
             // This method isn't quite as clean but gets the job done.
             // Also note that the file may not yet exist, so we cannot rely
             // on fileinfo() or other disk-level utilities.
             if (strrpos($filepath, '.' . $extension) === strlen($filepath) - strlen('.' . $extension)) {
               return new $implementation['class']($filepath);
+            }
+          }
+        }
+      }
       /**
        * Assembles the Drupal Updater registry.
+       *
        * An Updater is a class that knows how to update various parts of the Drupal
        * file system, for example to update modules that have newer releases, or to
        * install a new theme.
+       *
        * @return
        *   The Drupal Updater class registry.
+       *
        * @see hook_updater_info()
        * @see hook_updater_info_alter()
        */
       function drupal_get_updaters() {
         $updaters = &drupal_static(__FUNCTION__);
         if (!isset($updaters)) {
           $updaters = module_invoke_all('updater_info');
           drupal_alter('updater_info', $updaters);
           uasort($updaters, 'drupal_sort_weight');
+        }
         return $updaters;
+      }
       /**
        * Assembles the Drupal FileTransfer registry.
+       *
        * @return
        *   The Drupal FileTransfer class registry.
+       *
        * @see FileTransfer
        * @see hook_filetransfer_info()
        * @see hook_filetransfer_info_alter()
        */
       function drupal_get_filetransfer_info() {
         $info = &drupal_static(__FUNCTION__);
         if (!isset($info)) {
           // Since we have to manually set the 'file path' default for each
           // module separately, we can't use module_invoke_all().
           $info = array();
           foreach (module_implements('filetransfer_info') as $module) {
             $function = $module . '_filetransfer_info';
             if (function_exists($function)) {
               $result = $function();
               if (isset($result) && is_array($result)) {
                 foreach ($result as &$values) {
                   if (empty($values['file path'])) {
                     $values['file path'] = drupal_get_path('module', $module);
+                  }
+                }
                 $info = array_merge_recursive($info, $result);
+              }
+            }
+          }
           drupal_alter('filetransfer_info', $info);
           uasort($info, 'drupal_sort_weight');
+        }
         return $info;
+      }

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