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

root / drupal7 / includes / bootstrap.inc @ 26e8440b

       <?php
       /**
        * @file
        * Functions that need to be loaded on every Drupal request.
        */
       /**
        * The current system version.
        */
       define('VERSION', '7.70');
       /**
        * Core API compatibility.
        */
       define('DRUPAL_CORE_COMPATIBILITY', '7.x');
       /**
        * Minimum supported version of PHP.
        */
       define('DRUPAL_MINIMUM_PHP', '5.2.4');
       /**
        * Minimum recommended value of PHP memory_limit.
        */
       define('DRUPAL_MINIMUM_PHP_MEMORY_LIMIT', '32M');
       /**
        * Error reporting level: display no errors.
        */
       define('ERROR_REPORTING_HIDE', 0);
       /**
        * Error reporting level: display errors and warnings.
        */
       define('ERROR_REPORTING_DISPLAY_SOME', 1);
       /**
        * Error reporting level: display all messages.
        */
       define('ERROR_REPORTING_DISPLAY_ALL', 2);
       /**
        * Indicates that the item should never be removed unless explicitly selected.
+       *
        * The item may be removed using cache_clear_all() with a cache ID.
        */
       define('CACHE_PERMANENT', 0);
       /**
        * Indicates that the item should be removed at the next general cache wipe.
        */
       define('CACHE_TEMPORARY', -1);
       /**
        * @defgroup logging_severity_levels Logging severity levels
        * @{
        * Logging severity levels as defined in RFC 3164.
+       *
        * The WATCHDOG_* constant definitions correspond to the logging severity levels
        * defined in RFC 3164, section 4.1.1. PHP supplies predefined LOG_* constants
        * for use in the syslog() function, but their values on Windows builds do not
        * correspond to RFC 3164. The associated PHP bug report was closed with the
        * comment, "And it's also not a bug, as Windows just have less log levels,"
        * and "So the behavior you're seeing is perfectly normal."
+       *
        * @see http://www.faqs.org/rfcs/rfc3164.html
        * @see http://bugs.php.net/bug.php?id=18090
        * @see http://php.net/manual/function.syslog.php
        * @see http://php.net/manual/network.constants.php
        * @see watchdog()
        * @see watchdog_severity_levels()
        */
       /**
        * Log message severity -- Emergency: system is unusable.
        */
       define('WATCHDOG_EMERGENCY', 0);
       /**
        * Log message severity -- Alert: action must be taken immediately.
        */
       define('WATCHDOG_ALERT', 1);
       /**
        * Log message severity -- Critical conditions.
        */
       define('WATCHDOG_CRITICAL', 2);
       /**
        * Log message severity -- Error conditions.
        */
       define('WATCHDOG_ERROR', 3);
       /**
        * Log message severity -- Warning conditions.
        */
       define('WATCHDOG_WARNING', 4);
       /**
        * Log message severity -- Normal but significant conditions.
        */
       define('WATCHDOG_NOTICE', 5);
       /**
        * Log message severity -- Informational messages.
        */
       define('WATCHDOG_INFO', 6);
       /**
        * Log message severity -- Debug-level messages.
        */
       define('WATCHDOG_DEBUG', 7);
       /**
        * @} End of "defgroup logging_severity_levels".
        */
       /**
        * First bootstrap phase: initialize configuration.
        */
       define('DRUPAL_BOOTSTRAP_CONFIGURATION', 0);
       /**
        * Second bootstrap phase: try to serve a cached page.
        */
       define('DRUPAL_BOOTSTRAP_PAGE_CACHE', 1);
       /**
        * Third bootstrap phase: initialize database layer.
        */
       define('DRUPAL_BOOTSTRAP_DATABASE', 2);
       /**
        * Fourth bootstrap phase: initialize the variable system.
        */
       define('DRUPAL_BOOTSTRAP_VARIABLES', 3);
       /**
        * Fifth bootstrap phase: initialize session handling.
        */
       define('DRUPAL_BOOTSTRAP_SESSION', 4);
       /**
        * Sixth bootstrap phase: set up the page header.
        */
       define('DRUPAL_BOOTSTRAP_PAGE_HEADER', 5);
       /**
        * Seventh bootstrap phase: find out language of the page.
        */
       define('DRUPAL_BOOTSTRAP_LANGUAGE', 6);
       /**
        * Final bootstrap phase: Drupal is fully loaded; validate and fix input data.
        */
       define('DRUPAL_BOOTSTRAP_FULL', 7);
       /**
        * Role ID for anonymous users; should match what's in the "role" table.
        */
       define('DRUPAL_ANONYMOUS_RID', 1);
       /**
        * Role ID for authenticated users; should match what's in the "role" table.
        */
       define('DRUPAL_AUTHENTICATED_RID', 2);
       /**
        * The number of bytes in a kilobyte.
+       *
        * For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
        */
       define('DRUPAL_KILOBYTE', 1024);
       /**
        * The language code used when no language is explicitly assigned.
+       *
        * Defined by ISO639-2 for "Undetermined".
        */
       define('LANGUAGE_NONE', 'und');
       /**
        * The type of language used to define the content language.
        */
       define('LANGUAGE_TYPE_CONTENT', 'language_content');
       /**
        * The type of language used to select the user interface.
        */
       define('LANGUAGE_TYPE_INTERFACE', 'language');
       /**
        * The type of language used for URLs.
        */
       define('LANGUAGE_TYPE_URL', 'language_url');
       /**
        * Language written left to right. Possible value of $language->direction.
        */
       define('LANGUAGE_LTR', 0);
       /**
        * Language written right to left. Possible value of $language->direction.
        */
       define('LANGUAGE_RTL', 1);
       /**
        * Time of the current request in seconds elapsed since the Unix Epoch.
+       *
        * This differs from $_SERVER['REQUEST_TIME'], which is stored as a float
        * since PHP 5.4.0. Float timestamps confuse most PHP functions
        * (including date_create()).
+       *
        * @see http://php.net/manual/reserved.variables.server.php
        * @see http://php.net/manual/function.time.php
        */
       define('REQUEST_TIME', (int) $_SERVER['REQUEST_TIME']);
       /**
        * Flag used to indicate that text is not sanitized, so run check_plain().
+       *
        * @see drupal_set_title()
        */
       define('CHECK_PLAIN', 0);
       /**
        * Flag used to indicate that text has already been sanitized.
+       *
        * @see drupal_set_title()
        */
       define('PASS_THROUGH', -1);
       /**
        * Signals that the registry lookup cache should be reset.
        */
       define('REGISTRY_RESET_LOOKUP_CACHE', 1);
       /**
        * Signals that the registry lookup cache should be written to storage.
        */
       define('REGISTRY_WRITE_LOOKUP_CACHE', 2);
       /**
        * Regular expression to match PHP function names.
+       *
        * @see http://php.net/manual/language.functions.php
        */
       define('DRUPAL_PHP_FUNCTION_PATTERN', '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*');
       /**
        * A RFC7231 Compliant date.
+       *
        * http://tools.ietf.org/html/rfc7231#section-7.1.1.1
+       *
        * Example: Sun, 06 Nov 1994 08:49:37 GMT
+       *
        * This constant was introduced in PHP 7.0.19 and PHP 7.1.5 but needs to be
        * defined by Drupal for earlier PHP versions.
        */
       if (!defined('DATE_RFC7231')) {
         define('DATE_RFC7231', 'D, d M Y H:i:s \G\M\T');
+      }
       /**
        * Provides a caching wrapper to be used in place of large array structures.
+       *
        * This class should be extended by systems that need to cache large amounts
        * of data and have it represented as an array to calling functions. These
        * arrays can become very large, so ArrayAccess is used to allow different
        * strategies to be used for caching internally (lazy loading, building caches
        * over time etc.). This can dramatically reduce the amount of data that needs
        * to be loaded from cache backends on each request, and memory usage from
        * static caches of that same data.
+       *
        * Note that array_* functions do not work with ArrayAccess. Systems using
        * DrupalCacheArray should use this only internally. If providing API functions
        * that return the full array, this can be cached separately or returned
        * directly. However since DrupalCacheArray holds partial content by design, it
        * should be a normal PHP array or otherwise contain the full structure.
+       *
        * Note also that due to limitations in PHP prior to 5.3.4, it is impossible to
        * write directly to the contents of nested arrays contained in this object.
        * Only writes to the top-level array elements are possible. So if you
        * previously had set $object['foo'] = array(1, 2, 'bar' => 'baz'), but later
        * want to change the value of 'bar' from 'baz' to 'foobar', you cannot do so
        * a targeted write like $object['foo']['bar'] = 'foobar'. Instead, you must
        * overwrite the entire top-level 'foo' array with the entire set of new
        * values: $object['foo'] = array(1, 2, 'bar' => 'foobar'). Due to this same
        * limitation, attempts to create references to any contained data, nested or
        * otherwise, will fail silently. So $var = &$object['foo'] will not throw an
        * error, and $var will be populated with the contents of $object['foo'], but
        * that data will be passed by value, not reference. For more information on
        * the PHP limitation, see the note in the official PHP documentation at·
        * http://php.net/manual/arrayaccess.offsetget.php on
        * ArrayAccess::offsetGet().
+       *
        * By default, the class accounts for caches where calling functions might
        * request keys in the array that won't exist even after a cache rebuild. This
        * prevents situations where a cache rebuild would be triggered over and over
        * due to a 'missing' item. These cases are stored internally as a value of
        * NULL. This means that the offsetGet() and offsetExists() methods
        * must be overridden if caching an array where the top level values can
        * legitimately be NULL, and where $object->offsetExists() needs to correctly
        * return (equivalent to array_key_exists() vs. isset()). This should not
        * be necessary in the majority of cases.
+       *
        * Classes extending this class must override at least the
        * resolveCacheMiss() method to have a working implementation.
+       *
        * offsetSet() is not overridden by this class by default. In practice this
        * means that assigning an offset via arrayAccess will only apply while the
        * object is in scope and will not be written back to the persistent cache.
        * This follows a similar pattern to static vs. persistent caching in
        * procedural code. Extending classes may wish to alter this behavior, for
        * example by overriding offsetSet() and adding an automatic call to persist().
+       *
        * @see SchemaCache
        */
       abstract class DrupalCacheArray implements ArrayAccess {
         /**
          * A cid to pass to cache_set() and cache_get().
          */
         protected $cid;
         /**
          * A bin to pass to cache_set() and cache_get().
          */
         protected $bin;
         /**
          * An array of keys to add to the cache at the end of the request.
          */
         protected $keysToPersist = array();
         /**
          * Storage for the data itself.
          */
         protected $storage = array();
         /**
          * Constructs a DrupalCacheArray object.
+         *
          * @param $cid
          *   The cid for the array being cached.
          * @param $bin
          *   The bin to cache the array.
          */
         public function __construct($cid, $bin) {
           $this->cid = $cid;
           $this->bin = $bin;
           if ($cached = cache_get($this->cid, $this->bin)) {
            $this->storage = $cached->data;
+          }
+        }
         /**
          * Implements ArrayAccess::offsetExists().
          */
         public function offsetExists($offset) {
           return $this->offsetGet($offset) !== NULL;
+        }
         /**
          * Implements ArrayAccess::offsetGet().
          */
         public function offsetGet($offset) {
           if (isset($this->storage[$offset]) || array_key_exists($offset, $this->storage)) {
             return $this->storage[$offset];
+          }
           else {
             return $this->resolveCacheMiss($offset);
+          }
+        }
         /**
          * Implements ArrayAccess::offsetSet().
          */
         public function offsetSet($offset, $value) {
           $this->storage[$offset] = $value;
+        }
         /**
          * Implements ArrayAccess::offsetUnset().
          */
         public function offsetUnset($offset) {
           unset($this->storage[$offset]);
+        }
         /**
          * Flags an offset value to be written to the persistent cache.
+         *
          * If a value is assigned to a cache object with offsetSet(), by default it
          * will not be written to the persistent cache unless it is flagged with this
          * method. This allows items to be cached for the duration of a request,
          * without necessarily writing back to the persistent cache at the end.
+         *
          * @param $offset
          *   The array offset that was requested.
          * @param $persist
          *   Optional boolean to specify whether the offset should be persisted or
          *   not, defaults to TRUE. When called with $persist = FALSE the offset will
          *   be unflagged so that it will not be written at the end of the request.
          */
         protected function persist($offset, $persist = TRUE) {
           $this->keysToPersist[$offset] = $persist;
+        }
         /**
          * Resolves a cache miss.
+         *
          * When an offset is not found in the object, this is treated as a cache
          * miss. This method allows classes implementing the interface to look up
          * the actual value and allow it to be cached.
+         *
          * @param $offset
          *   The offset that was requested.
+         *
          * @return
          *   The value of the offset, or NULL if no value was found.
          */
         abstract protected function resolveCacheMiss($offset);
         /**
          * Writes a value to the persistent cache immediately.
+         *
          * @param $data
          *   The data to write to the persistent cache.
          * @param $lock
          *   Whether to acquire a lock before writing to cache.
          */
         protected function set($data, $lock = TRUE) {
           // Lock cache writes to help avoid stampedes.
           // To implement locking for cache misses, override __construct().
           $lock_name = $this->cid . ':' . $this->bin;
           if (!$lock || lock_acquire($lock_name)) {
             if ($cached = cache_get($this->cid, $this->bin)) {
               $data = $cached->data + $data;
+            }
             cache_set($this->cid, $data, $this->bin);
             if ($lock) {
               lock_release($lock_name);
+            }
+          }
+        }
         /**
          * Destructs the DrupalCacheArray object.
          */
         public function __destruct() {
           $data = array();
           foreach ($this->keysToPersist as $offset => $persist) {
             if ($persist) {
               $data[$offset] = $this->storage[$offset];
+            }
+          }
           if (!empty($data)) {
             $this->set($data);
+          }
+        }
+      }
       /**
        * Starts the timer with the specified name.
+       *
        * If you start and stop the same timer multiple times, the measured intervals
        * will be accumulated.
+       *
        * @param $name
        *   The name of the timer.
        */
       function timer_start($name) {
         global $timers;
         $timers[$name]['start'] = microtime(TRUE);
         $timers[$name]['count'] = isset($timers[$name]['count']) ? ++$timers[$name]['count'] : 1;
+      }
       /**
        * Reads the current timer value without stopping the timer.
+       *
        * @param $name
        *   The name of the timer.
+       *
        * @return
        *   The current timer value in ms.
        */
       function timer_read($name) {
         global $timers;
         if (isset($timers[$name]['start'])) {
           $stop = microtime(TRUE);
           $diff = round(($stop - $timers[$name]['start']) * 1000, 2);
           if (isset($timers[$name]['time'])) {
             $diff += $timers[$name]['time'];
+          }
           return $diff;
+        }
         return $timers[$name]['time'];
+      }
       /**
        * Stops the timer with the specified name.
+       *
        * @param $name
        *   The name of the timer.
+       *
        * @return
        *   A timer array. The array contains the number of times the timer has been
        *   started and stopped (count) and the accumulated timer value in ms (time).
        */
       function timer_stop($name) {
         global $timers;
         if (isset($timers[$name]['start'])) {
           $stop = microtime(TRUE);
           $diff = round(($stop - $timers[$name]['start']) * 1000, 2);
           if (isset($timers[$name]['time'])) {
             $timers[$name]['time'] += $diff;
+          }
           else {
             $timers[$name]['time'] = $diff;
+          }
           unset($timers[$name]['start']);
+        }
         return $timers[$name];
+      }
       /**
        * Returns the appropriate configuration directory.
+       *
        * Returns the configuration path based on the site's hostname, port, and
        * pathname. See default.settings.php for examples on how the URL is converted
        * to a directory.
+       *
        * @param bool $require_settings
        *   Only configuration directories with an existing settings.php file
        *   will be recognized. Defaults to TRUE. During initial installation,
        *   this is set to FALSE so that Drupal can detect a matching directory,
        *   then create a new settings.php file in it.
        * @param bool $reset
        *   Force a full search for matching directories even if one had been
        *   found previously. Defaults to FALSE.
+       *
        * @return
        *   The path of the matching directory.
+       *
        * @see default.settings.php
        */
       function conf_path($require_settings = TRUE, $reset = FALSE) {
         $conf = &drupal_static(__FUNCTION__, '');
         if ($conf && !$reset) {
           return $conf;
+        }
         $confdir = 'sites';
         $sites = array();
         if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/sites.php')) {
           // This will overwrite $sites with the desired mappings.
           include(DRUPAL_ROOT . '/' . $confdir . '/sites.php');
+        }
         $uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
         $server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
         for ($i = count($uri) - 1; $i > 0; $i--) {
           for ($j = count($server); $j > 0; $j--) {
             $dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
             if (isset($sites[$dir]) && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $sites[$dir])) {
               $dir = $sites[$dir];
+            }
             if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir . '/settings.php') || (!$require_settings && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir))) {
               $conf = "$confdir/$dir";
               return $conf;
+            }
+          }
+        }
         $conf = "$confdir/default";
         return $conf;
+      }
       /**
        * Sets appropriate server variables needed for command line scripts to work.
+       *
        * This function can be called by command line scripts before bootstrapping
        * Drupal, to ensure that the page loads with the desired server parameters.
        * This is because many parts of Drupal assume that they are running in a web
        * browser and therefore use information from the global PHP $_SERVER variable
        * that does not get set when Drupal is run from the command line.
+       *
        * In many cases, the default way in which this function populates the $_SERVER
        * variable is sufficient, and it can therefore be called without passing in
        * any input. However, command line scripts running on a multisite installation
        * (or on any installation that has settings.php stored somewhere other than
        * the sites/default folder) need to pass in the URL of the site to allow
        * Drupal to detect the correct location of the settings.php file. Passing in
        * the 'url' parameter is also required for functions like request_uri() to
        * return the expected values.
+       *
        * Most other parameters do not need to be passed in, but may be necessary in
        * some cases; for example, if Drupal's ip_address() function needs to return
        * anything but the standard localhost value ('127.0.0.1'), the command line
        * script should pass in the desired value via the 'REMOTE_ADDR' key.
+       *
        * @param $variables
        *   (optional) An associative array of variables within $_SERVER that should
        *   be replaced. If the special element 'url' is provided in this array, it
        *   will be used to populate some of the server defaults; it should be set to
        *   the URL of the current page request, excluding any $_GET request but
        *   including the script name (e.g., http://www.example.com/mysite/index.php).
+       *
        * @see conf_path()
        * @see request_uri()
        * @see ip_address()
        */
       function drupal_override_server_variables($variables = array()) {
         // Allow the provided URL to override any existing values in $_SERVER.
         if (isset($variables['url'])) {
           $url = parse_url($variables['url']);
           if (isset($url['host'])) {
             $_SERVER['HTTP_HOST'] = $url['host'];
+          }
           if (isset($url['path'])) {
             $_SERVER['SCRIPT_NAME'] = $url['path'];
+          }
           unset($variables['url']);
+        }
         // Define default values for $_SERVER keys. These will be used if $_SERVER
         // does not already define them and no other values are passed in to this
         // function.
         $defaults = array(
           'HTTP_HOST' => 'localhost',
           'SCRIPT_NAME' => NULL,
           'REMOTE_ADDR' => '127.0.0.1',
           'REQUEST_METHOD' => 'GET',
           'SERVER_NAME' => NULL,
           'SERVER_SOFTWARE' => NULL,
           'HTTP_USER_AGENT' => NULL,
         );
         // Replace elements of the $_SERVER array, as appropriate.
         $_SERVER = $variables + $_SERVER + $defaults;
+      }
       /**
        * Initializes the PHP environment.
        */
       function drupal_environment_initialize() {
         if (!isset($_SERVER['HTTP_REFERER'])) {
           $_SERVER['HTTP_REFERER'] = '';
+        }
         if (!isset($_SERVER['SERVER_PROTOCOL']) || ($_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.0' && $_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.1')) {
           $_SERVER['SERVER_PROTOCOL'] = 'HTTP/1.0';
+        }
         if (isset($_SERVER['HTTP_HOST'])) {
           // As HTTP_HOST is user input, ensure it only contains characters allowed
           // in hostnames. See RFC 952 (and RFC 2181).
           // $_SERVER['HTTP_HOST'] is lowercased here per specifications.
           $_SERVER['HTTP_HOST'] = strtolower($_SERVER['HTTP_HOST']);
           if (!drupal_valid_http_host($_SERVER['HTTP_HOST'])) {
             // HTTP_HOST is invalid, e.g. if containing slashes it may be an attack.
             header($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
             exit;
+          }
+        }
         else {
           // Some pre-HTTP/1.1 clients will not send a Host header. Ensure the key is
           // defined for E_ALL compliance.
           $_SERVER['HTTP_HOST'] = '';
+        }
         // When clean URLs are enabled, emulate ?q=foo/bar using REQUEST_URI. It is
         // not possible to append the query string using mod_rewrite without the B
         // flag (this was added in Apache 2.2.8), because mod_rewrite unescapes the
         // path before passing it on to PHP. This is a problem when the path contains
         // e.g. "&" or "%" that have special meanings in URLs and must be encoded.
         $_GET['q'] = request_path();
         // Enforce E_ALL, but allow users to set levels not part of E_ALL.
         error_reporting(E_ALL | error_reporting());
         // Override PHP settings required for Drupal to work properly.
         // sites/default/default.settings.php contains more runtime settings.
         // The .htaccess file contains settings that cannot be changed at runtime.
         // Don't escape quotes when reading files from the database, disk, etc.
         ini_set('magic_quotes_runtime', '0');
         // Use session cookies, not transparent sessions that puts the session id in
         // the query string.
         ini_set('session.use_cookies', '1');
         ini_set('session.use_only_cookies', '1');
         ini_set('session.use_trans_sid', '0');
         // Don't send HTTP headers using PHP's session handler.
         // An empty string is used here to disable the cache limiter.
         ini_set('session.cache_limiter', '');
         // Use httponly session cookies.
         ini_set('session.cookie_httponly', '1');
         // Set sane locale settings, to ensure consistent string, dates, times and
         // numbers handling.
         setlocale(LC_ALL, 'C');
         // PHP's built-in phar:// stream wrapper is not sufficiently secure. Override
         // it with a more secure one, which requires PHP 5.3.3. For lower versions,
         // unregister the built-in one without replacing it. Sites needing phar
         // support for lower PHP versions must implement hook_stream_wrappers() to
         // register their desired implementation.
         if (in_array('phar', stream_get_wrappers(), TRUE)) {
           stream_wrapper_unregister('phar');
           if (version_compare(PHP_VERSION, '5.3.3', '>=')) {
             include_once DRUPAL_ROOT . '/includes/file.phar.inc';
             file_register_phar_wrapper();
+          }
+        }
+      }
       /**
        * Validates that a hostname (for example $_SERVER['HTTP_HOST']) is safe.
+       *
        * @return
        *  TRUE if only containing valid characters, or FALSE otherwise.
        */
       function drupal_valid_http_host($host) {
         // Limit the length of the host name to 1000 bytes to prevent DoS attacks with
         // long host names.
         return strlen($host) <= 1000
           // Limit the number of subdomains and port separators to prevent DoS attacks
           // in conf_path().
           && substr_count($host, '.') <= 100
           && substr_count($host, ':') <= 100
           && preg_match('/^\[?(?:[a-zA-Z0-9-:\]_]+\.?)+$/', $host);
+      }
       /**
        * Checks whether an HTTPS request is being served.
+       *
        * @return bool
        *   TRUE if the request is HTTPS, FALSE otherwise.
        */
       function drupal_is_https() {
         return isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';
+      }
       /**
        * Sets the base URL, cookie domain, and session name from configuration.
        */
       function drupal_settings_initialize() {
         global $base_url, $base_path, $base_root;
         // Export these settings.php variables to the global namespace.
         global $databases, $cookie_domain, $conf, $installed_profile, $update_free_access, $db_url, $db_prefix, $drupal_hash_salt, $is_https, $base_secure_url, $base_insecure_url;
         $conf = array();
         if (file_exists(DRUPAL_ROOT . '/' . conf_path() . '/settings.php')) {
           include_once DRUPAL_ROOT . '/' . conf_path() . '/settings.php';
+        }
         $is_https = drupal_is_https();
         if (isset($base_url)) {
           // Parse fixed base URL from settings.php.
           $parts = parse_url($base_url);
           if (!isset($parts['path'])) {
             $parts['path'] = '';
+          }
           $base_path = $parts['path'] . '/';
           // Build $base_root (everything until first slash after "scheme://").
           $base_root = substr($base_url, 0, strlen($base_url) - strlen($parts['path']));
+        }
         else {
           // Create base URL.
           $http_protocol = $is_https ? 'https' : 'http';
           $base_root = $http_protocol . '://' . $_SERVER['HTTP_HOST'];
           $base_url = $base_root;
           // $_SERVER['SCRIPT_NAME'] can, in contrast to $_SERVER['PHP_SELF'], not
           // be modified by a visitor.
           if ($dir = rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/')) {
             $base_path = $dir;
             $base_url .= $base_path;
             $base_path .= '/';
+          }
           else {
             $base_path = '/';
+          }
+        }
         $base_secure_url = str_replace('http://', 'https://', $base_url);
         $base_insecure_url = str_replace('https://', 'http://', $base_url);
         if ($cookie_domain) {
           // If the user specifies the cookie domain, also use it for session name.
           $session_name = $cookie_domain;
+        }
         else {
           // Otherwise use $base_url as session name, without the protocol
           // to use the same session identifiers across HTTP and HTTPS.
           list( , $session_name) = explode('://', $base_url, 2);
           // HTTP_HOST can be modified by a visitor, but we already sanitized it
           // in drupal_settings_initialize().
           if (!empty($_SERVER['HTTP_HOST'])) {
             $cookie_domain = $_SERVER['HTTP_HOST'];
             // Strip leading periods, www., and port numbers from cookie domain.
             $cookie_domain = ltrim($cookie_domain, '.');
             if (strpos($cookie_domain, 'www.') === 0) {
               $cookie_domain = substr($cookie_domain, 4);
+            }
             $cookie_domain = explode(':', $cookie_domain);
             $cookie_domain = '.' . $cookie_domain[0];
+          }
+        }
         // Per RFC 2109, cookie domains must contain at least one dot other than the
         // first. For hosts such as 'localhost' or IP Addresses we don't set a cookie domain.
         if (count(explode('.', $cookie_domain)) > 2 && !is_numeric(str_replace('.', '', $cookie_domain))) {
           ini_set('session.cookie_domain', $cookie_domain);
+        }
         // To prevent session cookies from being hijacked, a user can configure the
         // SSL version of their website to only transfer session cookies via SSL by
         // using PHP's session.cookie_secure setting. The browser will then use two
         // separate session cookies for the HTTPS and HTTP versions of the site. So we
         // must use different session identifiers for HTTPS and HTTP to prevent a
         // cookie collision.
         if ($is_https) {
           ini_set('session.cookie_secure', TRUE);
+        }
         $prefix = ini_get('session.cookie_secure') ? 'SSESS' : 'SESS';
         session_name($prefix . substr(hash('sha256', $session_name), 0, 32));
+      }
       /**
        * Returns and optionally sets the filename for a system resource.
+       *
        * The filename, whether provided, cached, or retrieved from the database, is
        * only returned if the file exists.
+       *
        * This function plays a key role in allowing Drupal's resources (modules
        * and themes) to be located in different places depending on a site's
        * configuration. For example, a module 'foo' may legally be located
        * in any of these three places:
+       *
        * modules/foo/foo.module
        * sites/all/modules/foo/foo.module
        * sites/example.com/modules/foo/foo.module
+       *
        * Calling drupal_get_filename('module', 'foo') will give you one of
        * the above, depending on where the module is located.
+       *
        * @param $type
        *   The type of the item (theme, theme_engine, module, profile).
        * @param $name
        *   The name of the item for which the filename is requested.
        * @param $filename
        *   The filename of the item if it is to be set explicitly rather
        *   than by consulting the database.
        * @param bool $trigger_error
        *   Whether to trigger an error when a file is missing or has unexpectedly
        *   moved. This defaults to TRUE, but can be set to FALSE by calling code that
        *   merely wants to check whether an item exists in the filesystem.
+       *
        * @return
        *   The filename of the requested item or NULL if the item is not found.
        */
       function drupal_get_filename($type, $name, $filename = NULL, $trigger_error = TRUE) {
         // The $files static variable will hold the locations of all requested files.
         // We can be sure that any file listed in this static variable actually
         // exists as all additions have gone through a file_exists() check.
         // The location of files will not change during the request, so do not use
         // drupal_static().
         static $files = array();
         // Profiles are a special case: they have a fixed location and naming.
         if ($type == 'profile') {
           $profile_filename = "profiles/$name/$name.profile";
           $files[$type][$name] = file_exists($profile_filename) ? $profile_filename : FALSE;
+        }
         if (!isset($files[$type])) {
           $files[$type] = array();
+        }
         if (!empty($filename) && file_exists($filename)) {
           // Prime the static cache with the provided filename.
           $files[$type][$name] = $filename;
+        }
         elseif (isset($files[$type][$name])) {
           // This item had already been found earlier in the request, either through
           // priming of the static cache (for example, in system_list()), through a
           // lookup in the {system} table, or through a file scan (cached or not). Do
           // nothing.
+        }
         else {
           // Look for the filename listed in the {system} table. Verify that we have
           // an active database connection before doing so, since this function is
           // called both before we have a database connection (i.e. during
           // installation) and when a database connection fails.
           $database_unavailable = TRUE;
           try {
             if (function_exists('db_query')) {
               $file = db_query("SELECT filename FROM {system} WHERE name = :name AND type = :type", array(':name' => $name, ':type' => $type))->fetchField();
               if ($file !== FALSE && file_exists(DRUPAL_ROOT . '/' . $file)) {
                 $files[$type][$name] = $file;
+              }
               $database_unavailable = FALSE;
+            }
+          }
           catch (Exception $e) {
             // The database table may not exist because Drupal is not yet installed,
             // the database might be down, or we may have done a non-database cache
             // flush while $conf['page_cache_without_database'] = TRUE and
             // $conf['page_cache_invoke_hooks'] = TRUE. We have a fallback for these
             // cases so we hide the error completely.
+          }
           // Fall back to searching the filesystem if the database could not find the
           // file or the file does not exist at the path returned by the database.
           if (!isset($files[$type][$name])) {
             $files[$type][$name] = _drupal_get_filename_fallback($type, $name, $trigger_error, $database_unavailable);
+          }
+        }
         if (isset($files[$type][$name])) {
           return $files[$type][$name];
+        }
+      }
       /**
        * Performs a cached file system scan as a fallback when searching for a file.
+       *
        * This function looks for the requested file by triggering a file scan,
        * caching the new location if the file has moved and caching the miss
        * if the file is missing. If a file had been marked as missing in a previous
        * file scan, or if it has been marked as moved and is still in the last known
        * location, no new file scan will be performed.
+       *
        * @param string $type
        *   The type of the item (theme, theme_engine, module, profile).
        * @param string $name
        *   The name of the item for which the filename is requested.
        * @param bool $trigger_error
        *   Whether to trigger an error when a file is missing or has unexpectedly
        *   moved.
        * @param bool $database_unavailable
        *   Whether this function is being called because the Drupal database could
        *   not be queried for the file's location.
+       *
        * @return
        *   The filename of the requested item or NULL if the item is not found.
+       *
        * @see drupal_get_filename()
        */
       function _drupal_get_filename_fallback($type, $name, $trigger_error, $database_unavailable) {
         $file_scans = &_drupal_file_scan_cache();
         $filename = NULL;
         // If the cache indicates that the item is missing, or we can verify that the
         // item exists in the location the cache says it exists in, use that.
         if (isset($file_scans[$type][$name]) && ($file_scans[$type][$name] === FALSE || file_exists($file_scans[$type][$name]))) {
           $filename = $file_scans[$type][$name];
+        }
         // Otherwise, perform a new file scan to find the item.
         else {
           $filename = _drupal_get_filename_perform_file_scan($type, $name);
           // Update the static cache, and mark the persistent cache for updating at
           // the end of the page request. See drupal_file_scan_write_cache().
           $file_scans[$type][$name] = $filename;
           $file_scans['#write_cache'] = TRUE;
+        }
         // If requested, trigger a user-level warning about the missing or
         // unexpectedly moved file. If the database was unavailable, do not trigger a
         // warning in the latter case, though, since if the {system} table could not
         // be queried there is no way to know if the location found here was
         // "unexpected" or not.
         if ($trigger_error) {
           $error_type = $filename === FALSE ? 'missing' : 'moved';
           if ($error_type == 'missing' || !$database_unavailable) {
             _drupal_get_filename_fallback_trigger_error($type, $name, $error_type);
+          }
+        }
         // The cache stores FALSE for files that aren't found (to be able to
         // distinguish them from files that have not yet been searched for), but
         // drupal_get_filename() expects NULL for these instead, so convert to NULL
         // before returning.
         if ($filename === FALSE) {
           $filename = NULL;
+        }
         return $filename;
+      }
       /**
        * Returns the current list of cached file system scan results.
+       *
        * @return
        *   An associative array tracking the most recent file scan results for all
        *   files that have had scans performed. The keys are the type and name of the
        *   item that was searched for, and the values can be either:
        *   - Boolean FALSE if the item was not found in the file system.
        *   - A string pointing to the location where the item was found.
        */
       function &_drupal_file_scan_cache() {
         $file_scans = &drupal_static(__FUNCTION__, array());
         // The file scan results are stored in a persistent cache (in addition to the
         // static cache) but because this function can be called before the
         // persistent cache is available, we must merge any items that were found
         // earlier in the page request into the results from the persistent cache.
         if (!isset($file_scans['#cache_merge_done'])) {
           try {
             if (function_exists('cache_get')) {
               $cache = cache_get('_drupal_file_scan_cache', 'cache_bootstrap');
               if (!empty($cache->data)) {
                 // File scan results from the current request should take precedence
                 // over the results from the persistent cache, since they are newer.
                 $file_scans = drupal_array_merge_deep($cache->data, $file_scans);
+              }
               // Set a flag to indicate that the persistent cache does not need to be
               // merged again.
               $file_scans['#cache_merge_done'] = TRUE;
+            }
+          }
           catch (Exception $e) {
             // Hide the error.
+          }
+        }
         return $file_scans;
+      }
       /**
        * Performs a file system scan to search for a system resource.
+       *
        * @param $type
        *   The type of the item (theme, theme_engine, module, profile).
        * @param $name
        *   The name of the item for which the filename is requested.
+       *
        * @return
        *   The filename of the requested item or FALSE if the item is not found.
+       *
        * @see drupal_get_filename()
        * @see _drupal_get_filename_fallback()
        */
       function _drupal_get_filename_perform_file_scan($type, $name) {
         // The location of files will not change during the request, so do not use
         // drupal_static().
         static $dirs = array(), $files = array();
         // We have a consistent directory naming: modules, themes...
         $dir = $type . 's';
         if ($type == 'theme_engine') {
           $dir = 'themes/engines';
           $extension = 'engine';
+        }
         elseif ($type == 'theme') {
           $extension = 'info';
+        }
         else {
           $extension = $type;
+        }
         // Check if we had already scanned this directory/extension combination.
         if (!isset($dirs[$dir][$extension])) {
           // Log that we have now scanned this directory/extension combination
           // into a static variable so as to prevent unnecessary file scans.
           $dirs[$dir][$extension] = TRUE;
           if (!function_exists('drupal_system_listing')) {
             require_once DRUPAL_ROOT . '/includes/common.inc';
+          }
           // Scan the appropriate directories for all files with the requested
           // extension, not just the file we are currently looking for. This
           // prevents unnecessary scans from being repeated when this function is
           // called more than once in the same page request.
           $matches = drupal_system_listing("/^" . DRUPAL_PHP_FUNCTION_PATTERN . "\.$extension$/", $dir, 'name', 0);
           foreach ($matches as $matched_name => $file) {
             // Log the locations found in the file scan into a static variable.
             $files[$type][$matched_name] = $file->uri;
+          }
+        }
         // Return the results of the file system scan, or FALSE to indicate the file
         // was not found.
         return isset($files[$type][$name]) ? $files[$type][$name] : FALSE;
+      }
       /**
        * Triggers a user-level warning for missing or unexpectedly moved files.
+       *
        * @param $type
        *   The type of the item (theme, theme_engine, module, profile).
        * @param $name
        *   The name of the item for which the filename is requested.
        * @param $error_type
        *   The type of the error ('missing' or 'moved').
+       *
        * @see drupal_get_filename()
        * @see _drupal_get_filename_fallback()
        */
       function _drupal_get_filename_fallback_trigger_error($type, $name, $error_type) {
         // Hide messages due to known bugs that will appear on a lot of sites.
         // @todo Remove this in https://www.drupal.org/node/2383823
         if (empty($name)) {
           return;
+        }
         // Make sure we only show any missing or moved file errors only once per
         // request.
         static $errors_triggered = array();
         if (empty($errors_triggered[$type][$name][$error_type])) {
           // Use _drupal_trigger_error_with_delayed_logging() here since these are
           // triggered during low-level operations that cannot necessarily be
           // interrupted by a watchdog() call.
           if ($error_type == 'missing') {
             _drupal_trigger_error_with_delayed_logging(format_string('The following @type is missing from the file system: %name. For information about how to fix this, see <a href="@documentation">the documentation page</a>.', array('@type' => $type, '%name' => $name, '@documentation' => 'https://www.drupal.org/node/2487215')), E_USER_WARNING);
+          }
           elseif ($error_type == 'moved') {
             _drupal_trigger_error_with_delayed_logging(format_string('The following @type has moved within the file system: %name. In order to fix this, clear caches or put the @type back in its original location. For more information, see <a href="@documentation">the documentation page</a>.', array('@type' => $type, '%name' => $name, '@documentation' => 'https://www.drupal.org/node/2487215')), E_USER_WARNING);
+          }
           $errors_triggered[$type][$name][$error_type] = TRUE;
+        }
+      }
       /**
        * Invokes trigger_error() with logging delayed until the end of the request.
+       *
        * This is an alternative to PHP's trigger_error() function which can be used
        * during low-level Drupal core operations that need to avoid being interrupted
        * by a watchdog() call.
+       *
        * Normally, Drupal's error handler calls watchdog() in response to a
        * trigger_error() call. However, this invokes hook_watchdog() which can run
        * arbitrary code. If the trigger_error() happens in the middle of an
        * operation such as a rebuild operation which should not be interrupted by
        * arbitrary code, that could potentially break or trigger the rebuild again.
        * This function protects against that by delaying the watchdog() call until
        * the end of the current page request.
+       *
        * This is an internal function which should only be called by low-level Drupal
        * core functions. It may be removed in a future Drupal 7 release.
+       *
        * @param string $error_msg
        *   The error message to trigger. As with trigger_error() itself, this is
        *   limited to 1024 bytes; additional characters beyond that will be removed.
        * @param int $error_type
        *   (optional) The type of error. This should be one of the E_USER family of
        *   constants. As with trigger_error() itself, this defaults to E_USER_NOTICE
        *   if not provided.
+       *
        * @see _drupal_log_error()
        */
       function _drupal_trigger_error_with_delayed_logging($error_msg, $error_type = E_USER_NOTICE) {
         $delay_logging = &drupal_static(__FUNCTION__, FALSE);
         $delay_logging = TRUE;
         trigger_error($error_msg, $error_type);
         $delay_logging = FALSE;
+      }
       /**
        * Writes the file scan cache to the persistent cache.
+       *
        * This cache stores all files marked as missing or moved after a file scan
        * to prevent unnecessary file scans in subsequent requests. This cache is
        * cleared in system_list_reset() (i.e. after a module/theme rebuild).
        */
       function drupal_file_scan_write_cache() {
         // Only write to the persistent cache if requested, and if we know that any
         // data previously in the cache was successfully loaded and merged in by
         // _drupal_file_scan_cache().
         $file_scans = &_drupal_file_scan_cache();
         if (isset($file_scans['#write_cache']) && isset($file_scans['#cache_merge_done'])) {
           unset($file_scans['#write_cache']);
           cache_set('_drupal_file_scan_cache', $file_scans, 'cache_bootstrap');
+        }
+      }
       /**
        * Loads the persistent variable table.
+       *
        * The variable table is composed of values that have been saved in the table
        * with variable_set() as well as those explicitly specified in the
        * configuration file.
        */
       function variable_initialize($conf = array()) {
         // NOTE: caching the variables improves performance by 20% when serving
         // cached pages.
         if ($cached = cache_get('variables', 'cache_bootstrap')) {
           $variables = $cached->data;
+        }
         else {
           // Cache miss. Avoid a stampede.
           $name = 'variable_init';
           if (!lock_acquire($name, 1)) {
             // Another request is building the variable cache.
             // Wait, then re-run this function.
             lock_wait($name);
             return variable_initialize($conf);
+          }
           else {
             // Proceed with variable rebuild.
             $variables = array_map('unserialize', db_query('SELECT name, value FROM {variable}')->fetchAllKeyed());
             cache_set('variables', $variables, 'cache_bootstrap');
             lock_release($name);
+          }
+        }
         foreach ($conf as $name => $value) {
           $variables[$name] = $value;
+        }
         return $variables;
+      }
       /**
        * Returns a persistent variable.
+       *
        * Case-sensitivity of the variable_* functions depends on the database
        * collation used. To avoid problems, always use lower case for persistent
        * variable names.
+       *
        * @param $name
        *   The name of the variable to return.
        * @param $default
        *   The default value to use if this variable has never been set.
+       *
        * @return
        *   The value of the variable. Unserialization is taken care of as necessary.
+       *
        * @see variable_del()
        * @see variable_set()
        */
       function variable_get($name, $default = NULL) {
         global $conf;
         return isset($conf[$name]) ? $conf[$name] : $default;
+      }
       /**
        * Sets a persistent variable.
+       *
        * Case-sensitivity of the variable_* functions depends on the database
        * collation used. To avoid problems, always use lower case for persistent
        * variable names.
+       *
        * @param $name
        *   The name of the variable to set.
        * @param $value
        *   The value to set. This can be any PHP data type; these functions take care
        *   of serialization as necessary.
+       *
        * @see variable_del()
        * @see variable_get()
        */
       function variable_set($name, $value) {
         global $conf;
         db_merge('variable')->key(array('name' => $name))->fields(array('value' => serialize($value)))->execute();
         cache_clear_all('variables', 'cache_bootstrap');
         $conf[$name] = $value;
+      }
       /**
        * Unsets a persistent variable.
+       *
        * Case-sensitivity of the variable_* functions depends on the database
        * collation used. To avoid problems, always use lower case for persistent
        * variable names.
+       *
        * @param $name
        *   The name of the variable to undefine.
+       *
        * @see variable_get()
        * @see variable_set()
        */
       function variable_del($name) {
         global $conf;
         db_delete('variable')
           ->condition('name', $name)
           ->execute();
         cache_clear_all('variables', 'cache_bootstrap');
         unset($conf[$name]);
+      }
       /**
        * Retrieves the current page from the cache.
+       *
        * Note: we do not serve cached pages to authenticated users, or to anonymous
        * users when $_SESSION is non-empty. $_SESSION may contain status messages
        * from a form submission, the contents of a shopping cart, or other user-
        * specific content that should not be cached and displayed to other users.
+       *
        * @param $check_only
        *   (optional) Set to TRUE to only return whether a previous call found a
        *   cache entry.
+       *
        * @return
        *   The cache object, if the page was found in the cache, NULL otherwise.
        */
       function drupal_page_get_cache($check_only = FALSE) {
         global $base_root;
         static $cache_hit = FALSE;
         if ($check_only) {
           return $cache_hit;
+        }
         if (drupal_page_is_cacheable()) {
           $cache = cache_get($base_root . request_uri(), 'cache_page');
           if ($cache !== FALSE) {
             $cache_hit = TRUE;
+          }
           return $cache;
+        }
+      }
       /**
        * Determines the cacheability of the current page.
+       *
        * @param $allow_caching
        *   Set to FALSE if you want to prevent this page from being cached.
+       *
        * @return
        *   TRUE if the current page can be cached, FALSE otherwise.
        */
       function drupal_page_is_cacheable($allow_caching = NULL) {
         $allow_caching_static = &drupal_static(__FUNCTION__, TRUE);
         if (isset($allow_caching)) {
           $allow_caching_static = $allow_caching;
+        }
         return $allow_caching_static && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD')
           && !drupal_is_cli();
+      }
       /**
        * Invokes a bootstrap hook in all bootstrap modules that implement it.
+       *
        * @param $hook
        *   The name of the bootstrap hook to invoke.
+       *
        * @see bootstrap_hooks()
        */
       function bootstrap_invoke_all($hook) {
         // Bootstrap modules should have been loaded when this function is called, so
         // we don't need to tell module_list() to reset its internal list (and we
         // therefore leave the first parameter at its default value of FALSE). We
         // still pass in TRUE for the second parameter, though; in case this is the
         // first time during the bootstrap that module_list() is called, we want to
         // make sure that its internal cache is primed with the bootstrap modules
         // only.
         foreach (module_list(FALSE, TRUE) as $module) {
           drupal_load('module', $module);
           module_invoke($module, $hook);
+        }
+      }
       /**
        * Includes a file with the provided type and name.
+       *
        * This prevents including a theme, engine, module, etc., more than once.
+       *
        * @param $type
        *   The type of item to load (i.e. theme, theme_engine, module).
        * @param $name
        *   The name of the item to load.
+       *
        * @return
        *   TRUE if the item is loaded or has already been loaded.
        */
       function drupal_load($type, $name) {
         // Once a file is included this can't be reversed during a request so do not
         // use drupal_static() here.
         static $files = array();
         if (isset($files[$type][$name])) {
           return TRUE;
+        }
         $filename = drupal_get_filename($type, $name);
         if ($filename) {
           include_once DRUPAL_ROOT . '/' . $filename;
           $files[$type][$name] = TRUE;
           return TRUE;
+        }
         return FALSE;
+      }
       /**
        * Sets an HTTP response header for the current page.
+       *
        * Note: When sending a Content-Type header, always include a 'charset' type,
        * too. This is necessary to avoid security bugs (e.g. UTF-7 XSS).
+       *
        * @param $name
        *   The HTTP header name, or the special 'Status' header name.
        * @param $value
        *   The HTTP header value; if equal to FALSE, the specified header is unset.
        *   If $name is 'Status', this is expected to be a status code followed by a
        *   reason phrase, e.g. "404 Not Found".
        * @param $append
        *   Whether to append the value to an existing header or to replace it.
        */
       function drupal_add_http_header($name, $value, $append = FALSE) {
         // The headers as name/value pairs.
         $headers = &drupal_static('drupal_http_headers', array());
         $name_lower = strtolower($name);
         _drupal_set_preferred_header_name($name);
         if ($value === FALSE) {
           $headers[$name_lower] = FALSE;
+        }
         elseif (isset($headers[$name_lower]) && $append) {
           // Multiple headers with identical names may be combined using comma (RFC
           // 2616, section 4.2).
           $headers[$name_lower] .= ',' . $value;
+        }
         else {
           $headers[$name_lower] = $value;
+        }
         drupal_send_headers(array($name => $headers[$name_lower]), TRUE);
+      }
       /**
        * Gets the HTTP response headers for the current page.
+       *
        * @param $name
        *   An HTTP header name. If omitted, all headers are returned as name/value
        *   pairs. If an array value is FALSE, the header has been unset.
+       *
        * @return
        *   A string containing the header value, or FALSE if the header has been set,
        *   or NULL if the header has not been set.
        */
       function drupal_get_http_header($name = NULL) {
         $headers = &drupal_static('drupal_http_headers', array());
         if (isset($name)) {
           $name = strtolower($name);
           return isset($headers[$name]) ? $headers[$name] : NULL;
+        }
         else {
           return $headers;
+        }
+      }
       /**
        * Sets the preferred name for the HTTP header.
+       *
        * Header names are case-insensitive, but for maximum compatibility they should
        * follow "common form" (see RFC 2617, section 4.2).
        */
       function _drupal_set_preferred_header_name($name = NULL) {
         static $header_names = array();
         if (!isset($name)) {
           return $header_names;
+        }
         $header_names[strtolower($name)] = $name;
+      }
       /**
        * Sends the HTTP response headers that were previously set, adding defaults.
+       *
        * Headers are set in drupal_add_http_header(). Default headers are not set
        * if they have been replaced or unset using drupal_add_http_header().
+       *
        * @param array $default_headers
        *   (optional) An array of headers as name/value pairs.
        * @param bool $only_default
        *   (optional) If TRUE and headers have already been sent, send only the
        *   specified headers.
        */
       function drupal_send_headers($default_headers = array(), $only_default = FALSE) {
         $headers_sent = &drupal_static(__FUNCTION__, FALSE);
         $headers = drupal_get_http_header();
         if ($only_default && $headers_sent) {
           $headers = array();
+        }
         $headers_sent = TRUE;
         $header_names = _drupal_set_preferred_header_name();
         foreach ($default_headers as $name => $value) {
           $name_lower = strtolower($name);
           if (!isset($headers[$name_lower])) {
             $headers[$name_lower] = $value;
             $header_names[$name_lower] = $name;
+          }
+        }
         foreach ($headers as $name_lower => $value) {
           if ($name_lower == 'status') {
             header($_SERVER['SERVER_PROTOCOL'] . ' ' . $value);
+          }
           // Skip headers that have been unset.
           elseif ($value !== FALSE) {
             header($header_names[$name_lower] . ': ' . $value);
+          }
+        }
+      }
       /**
        * Sets HTTP headers in preparation for a page response.
+       *
        * Authenticated users are always given a 'no-cache' header, and will fetch a
        * fresh page on every request. This prevents authenticated users from seeing
        * locally cached pages.
+       *
        * ETag and Last-Modified headers are not set per default for authenticated
        * users so that browsers do not send If-Modified-Since headers from
        * authenticated user pages. drupal_serve_page_from_cache() will set appropriate
        * ETag and Last-Modified headers for cached pages.
+       *
        * @see drupal_page_set_cache()
        */
       function drupal_page_header() {
         $headers_sent = &drupal_static(__FUNCTION__, FALSE);
         if ($headers_sent) {
           return TRUE;
+        }
         $headers_sent = TRUE;
         $default_headers = array(
           'Expires' => 'Sun, 19 Nov 1978 05:00:00 GMT',
           'Cache-Control' => 'no-cache, must-revalidate',
           // Prevent browsers from sniffing a response and picking a MIME type
           // different from the declared content-type, since that can lead to
           // XSS and other vulnerabilities.
           'X-Content-Type-Options' => 'nosniff',
         );
         drupal_send_headers($default_headers);
+      }
       /**
        * Sets HTTP headers in preparation for a cached page response.
+       *
        * The headers allow as much as possible in proxies and browsers without any
        * particular knowledge about the pages. Modules can override these headers
        * using drupal_add_http_header().
+       *
        * If the request is conditional (using If-Modified-Since and If-None-Match),
        * and the conditions match those currently in the cache, a 304 Not Modified
        * response is sent.
        */
       function drupal_serve_page_from_cache(stdClass $cache) {
         // Negotiate whether to use compression.
         $page_compression = !empty($cache->data['page_compressed']);
         $return_compressed = $page_compression && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE;
         // Get headers set in hook_boot(). Keys are lower-case.
         $hook_boot_headers = drupal_get_http_header();
         // Headers generated in this function, that may be replaced or unset using
         // drupal_add_http_headers(). Keys are mixed-case.
         $default_headers = array();
         foreach ($cache->data['headers'] as $name => $value) {
           // In the case of a 304 response, certain headers must be sent, and the
           // remaining may not (see RFC 2616, section 10.3.5). Do not override
           // headers set in hook_boot().
           $name_lower = strtolower($name);
           if (in_array($name_lower, array('content-location', 'expires', 'cache-control', 'vary')) && !isset($hook_boot_headers[$name_lower])) {
             drupal_add_http_header($name, $value);
             unset($cache->data['headers'][$name]);
+          }
+        }
         // If the client sent a session cookie, a cached copy will only be served
         // to that one particular client due to Vary: Cookie. Thus, do not set
         // max-age > 0, allowing the page to be cached by external proxies, when a
         // session cookie is present unless the Vary header has been replaced or
         // unset in hook_boot().
         $max_age = !isset($_COOKIE[session_name()]) || isset($hook_boot_headers['vary']) ? variable_get('page_cache_maximum_age', 0) : 0;
         $default_headers['Cache-Control'] = 'public, max-age=' . $max_age;
         // Entity tag should change if the output changes.
         $etag = '"' . $cache->created . '-' . intval($return_compressed) . '"';
         header('Etag: ' . $etag);
         // See if the client has provided the required HTTP headers.
         $if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) : FALSE;
         $if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : FALSE;
         if ($if_modified_since && $if_none_match
             && $if_none_match == $etag // etag must match
             && $if_modified_since == $cache->created) {  // if-modified-since must match
           header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
           drupal_send_headers($default_headers);
           return;
+        }
         // Send the remaining headers.
         foreach ($cache->data['headers'] as $name => $value) {
           drupal_add_http_header($name, $value);
+        }
         $default_headers['Last-Modified'] = gmdate(DATE_RFC7231, $cache->created);
         // HTTP/1.0 proxies does not support the Vary header, so prevent any caching
         // by sending an Expires date in the past. HTTP/1.1 clients ignores the
         // Expires header if a Cache-Control: max-age= directive is specified (see RFC
         // 2616, section 14.9.3).
         $default_headers['Expires'] = 'Sun, 19 Nov 1978 05:00:00 GMT';
         drupal_send_headers($default_headers);
         // Allow HTTP proxies to cache pages for anonymous users without a session
         // cookie. The Vary header is used to indicates the set of request-header
         // fields that fully determines whether a cache is permitted to use the
         // response to reply to a subsequent request for a given URL without
         // revalidation. If a Vary header has been set in hook_boot(), it is assumed
         // that the module knows how to cache the page.
         if (!isset($hook_boot_headers['vary']) && !variable_get('omit_vary_cookie')) {
           header('Vary: Cookie');
+        }
         if ($page_compression) {
           header('Vary: Accept-Encoding', FALSE);
           // If page_compression is enabled, the cache contains gzipped data.
           if ($return_compressed) {
             // $cache->data['body'] is already gzip'ed, so make sure
             // zlib.output_compression does not compress it once more.
             ini_set('zlib.output_compression', '0');
             header('Content-Encoding: gzip');
+          }
           else {
             // The client does not support compression, so unzip the data in the
             // cache. Strip the gzip header and run uncompress.
             $cache->data['body'] = gzinflate(substr(substr($cache->data['body'], 10), 0, -8));
+          }
+        }
         // Print the page.
         print $cache->data['body'];
+      }
       /**
        * Defines the critical hooks that force modules to always be loaded.
        */
       function bootstrap_hooks() {
         return array('boot', 'exit', 'watchdog', 'language_init');
+      }
       /**
        * Unserializes and appends elements from a serialized string.
+       *
        * @param $obj
        *   The object to which the elements are appended.
        * @param $field
        *   The attribute of $obj whose value should be unserialized.
        */
       function drupal_unpack($obj, $field = 'data') {
         if ($obj->$field && $data = unserialize($obj->$field)) {
           foreach ($data as $key => $value) {
             if (!empty($key) && !isset($obj->$key)) {
               $obj->$key = $value;
+            }
+          }
+        }
         return $obj;
+      }
       /**
        * Translates a string to the current language or to a given language.
+       *
        * The t() function serves two purposes. First, at run-time it translates
        * user-visible text into the appropriate language. Second, various mechanisms
        * that figure out what text needs to be translated work off t() -- the text
        * inside t() calls is added to the database of strings to be translated.
        * These strings are expected to be in English, so the first argument should
        * always be in English. To enable a fully-translatable site, it is important
        * that all human-readable text that will be displayed on the site or sent to
        * a user is passed through the t() function, or a related function. See the
        * @link http://drupal.org/node/322729 Localization API @endlink pages for
        * more information, including recommendations on how to break up or not
        * break up strings for translation.
+       *
        * @section sec_translating_vars Translating Variables
        * You should never use t() to translate variables, such as calling
        * @code t($text); @endcode, unless the text that the variable holds has been
        * passed through t() elsewhere (e.g., $text is one of several translated
        * literal strings in an array). It is especially important never to call
        * @code t($user_text); @endcode, where $user_text is some text that a user
        * entered - doing that can lead to cross-site scripting and other security
        * problems. However, you can use variable substitution in your string, to put
        * variable text such as user names or link URLs into translated text. Variable
        * substitution looks like this:
        * @code
        * $text = t("@name's blog", array('@name' => format_username($account)));
        * @endcode
        * Basically, you can put variables like @name into your string, and t() will
        * substitute their sanitized values at translation time. (See the
        * Localization API pages referenced above and the documentation of
        * format_string() for details about how to define variables in your string.)
        * Translators can then rearrange the string as necessary for the language
        * (e.g., in Spanish, it might be "blog de @name").
+       *
        * @section sec_alt_funcs_install Use During Installation Phase
        * During the Drupal installation phase, some resources used by t() wil not be
        * available to code that needs localization. See st() and get_t() for
        * alternatives.
+       *
        * @section sec_context String context
        * Matching source strings are normally only translated once, and the same
        * translation is used everywhere that has a matching string. However, in some
        * cases, a certain English source string needs to have multiple translations.
        * One example of this is the string "May", which could be used as either a
        * full month name or a 3-letter abbreviated month. In other languages where
        * the month name for May has more than 3 letters, you would need to provide
        * two different translations (one for the full name and one abbreviated), and
        * the correct form would need to be chosen, depending on how "May" is being
        * used. To facilitate this, the "May" string should be provided with two
        * different contexts in the $options parameter when calling t(). For example:
        * @code
        * t('May', array(), array('context' => 'Long month name')
        * t('May', array(), array('context' => 'Abbreviated month name')
        * @endcode
        * See https://localize.drupal.org/node/2109 for more information.
+       *
        * @param $string
        *   A string containing the English string to translate.
        * @param $args
        *   An associative array of replacements to make after translation. Based
        *   on the first character of the key, the value is escaped and/or themed.
        *   See format_string() for details.
        * @param $options
        *   An associative array of additional options, with the following elements:
        *   - 'langcode' (defaults to the current language): The language code to
        *     translate to a language other than what is used to display the page.
        *   - 'context' (defaults to the empty context): A string giving the context
        *     that the source string belongs to. See @ref sec_context above for more
        *     information.
+       *
        * @return
        *   The translated string.
+       *
        * @see st()
        * @see get_t()
        * @see format_string()
        * @ingroup sanitization
        */
       function t($string, array $args = array(), array $options = array()) {
         global $language;
         static $custom_strings;
         // Merge in default.
         if (empty($options['langcode'])) {
           $options['langcode'] = isset($language->language) ? $language->language : 'en';
+        }
         if (empty($options['context'])) {
           $options['context'] = '';
+        }
         // First, check for an array of customized strings. If present, use the array
         // *instead of* database lookups. This is a high performance way to provide a
         // handful of string replacements. See settings.php for examples.
         // Cache the $custom_strings variable to improve performance.
         if (!isset($custom_strings[$options['langcode']])) {
           $custom_strings[$options['langcode']] = variable_get('locale_custom_strings_' . $options['langcode'], array());
+        }
         // Custom strings work for English too, even if locale module is disabled.
         if (isset($custom_strings[$options['langcode']][$options['context']][$string])) {
           $string = $custom_strings[$options['langcode']][$options['context']][$string];
+        }
         // Translate with locale module if enabled.
         elseif ($options['langcode'] != 'en' && function_exists('locale')) {
           $string = locale($string, $options['context'], $options['langcode']);
+        }
         if (empty($args)) {
           return $string;
+        }
         else {
           return format_string($string, $args);
+        }
+      }
       /**
        * Formats a string for HTML display by replacing variable placeholders.
+       *
        * This function replaces variable placeholders in a string with the requested
        * values and escapes the values so they can be safely displayed as HTML. It
        * should be used on any unknown text that is intended to be printed to an HTML
        * page (especially text that may have come from untrusted users, since in that
        * case it prevents cross-site scripting and other security problems).
+       *
        * In most cases, you should use t() rather than calling this function
        * directly, since it will translate the text (on non-English-only sites) in
        * addition to formatting it.
+       *
        * @param $string
        *   A string containing placeholders.
        * @param $args
        *   An associative array of replacements to make. Occurrences in $string of
        *   any key in $args are replaced with the corresponding value, after optional
        *   sanitization and formatting. The type of sanitization and formatting
        *   depends on the first character of the key:
        *   - @variable: Escaped to HTML using check_plain(). Use this as the default
        *     choice for anything displayed on a page on the site.
        *   - %variable: Escaped to HTML and formatted using drupal_placeholder(),
        *     which makes it display as <em>emphasized</em> text.
        *   - !variable: Inserted as is, with no sanitization or formatting. Only use
        *     this for text that has already been prepared for HTML display (for
        *     example, user-supplied text that has already been run through
        *     check_plain() previously, or is expected to contain some limited HTML
        *     tags and has already been run through filter_xss() previously).
+       *
        * @see t()
        * @ingroup sanitization
        */
       function format_string($string, array $args = array()) {
         // Transform arguments before inserting them.
         foreach ($args as $key => $value) {
           switch ($key[0]) {
             case '@':
               // Escaped only.
               $args[$key] = check_plain($value);
               break;
             case '%':
             default:
               // Escaped and placeholder.
               $args[$key] = drupal_placeholder($value);
               break;
             case '!':
               // Pass-through.
+          }
+        }
         return strtr($string, $args);
+      }
       /**
        * Encodes special characters in a plain-text string for display as HTML.
+       *
        * Also validates strings as UTF-8 to prevent cross site scripting attacks on
        * Internet Explorer 6.
+       *
        * @param string $text
        *   The text to be checked or processed.
+       *
        * @return string
        *   An HTML safe version of $text. If $text is not valid UTF-8, an empty string
        *   is returned and, on PHP < 5.4, a warning may be issued depending on server
        *   configuration (see @link https://bugs.php.net/bug.php?id=47494 @endlink).
+       *
        * @see drupal_validate_utf8()
        * @ingroup sanitization
        */
       function check_plain($text) {
         return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
+      }
       /**
        * Checks whether a string is valid UTF-8.
+       *
        * All functions designed to filter input should use drupal_validate_utf8
        * to ensure they operate on valid UTF-8 strings to prevent bypass of the
        * filter.
+       *
        * When text containing an invalid UTF-8 lead byte (0xC0 - 0xFF) is presented
        * as UTF-8 to Internet Explorer 6, the program may misinterpret subsequent
        * bytes. When these subsequent bytes are HTML control characters such as
        * quotes or angle brackets, parts of the text that were deemed safe by filters
        * end up in locations that are potentially unsafe; An onerror attribute that
        * is outside of a tag, and thus deemed safe by a filter, can be interpreted
        * by the browser as if it were inside the tag.
+       *
        * The function does not return FALSE for strings containing character codes
        * above U+10FFFF, even though these are prohibited by RFC 3629.
+       *
        * @param $text
        *   The text to check.
+       *
        * @return
        *   TRUE if the text is valid UTF-8, FALSE if not.
        */
       function drupal_validate_utf8($text) {
         if (strlen($text) == 0) {
           return TRUE;
+        }
         // With the PCRE_UTF8 modifier 'u', preg_match() fails silently on strings
         // containing invalid UTF-8 byte sequences. It does not reject character
         // codes above U+10FFFF (represented by 4 or more octets), though.
         return (preg_match('/^./us', $text) == 1);
+      }
       /**
        * Returns the equivalent of Apache's $_SERVER['REQUEST_URI'] variable.
+       *
        * Because $_SERVER['REQUEST_URI'] is only available on Apache, we generate an
        * equivalent using other environment variables.
        */
       function request_uri() {
         if (isset($_SERVER['REQUEST_URI'])) {
           $uri = $_SERVER['REQUEST_URI'];
+        }
         else {
           if (isset($_SERVER['argv'])) {
             $uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['argv'][0];
+          }
           elseif (isset($_SERVER['QUERY_STRING'])) {
             $uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
+          }
           else {
             $uri = $_SERVER['SCRIPT_NAME'];
+          }
+        }
         // Prevent multiple slashes to avoid cross site requests via the Form API.
         $uri = '/' . ltrim($uri, '/');
         return $uri;
+      }
       /**
        * Logs an exception.
+       *
        * This is a wrapper function for watchdog() which automatically decodes an
        * exception.
+       *
        * @param $type
        *   The category to which this message belongs.
        * @param $exception
        *   The exception that is going to be logged.
        * @param $message
        *   The message to store in the log. If empty, a text that contains all useful
        *   information about the passed-in exception is used.
        * @param $variables
        *   Array of variables to replace in the message on display. Defaults to the
        *   return value of _drupal_decode_exception().
        * @param $severity
        *   The severity of the message, as per RFC 3164.
        * @param $link
        *   A link to associate with the message.
+       *
        * @see watchdog()
        * @see _drupal_decode_exception()
        */
       function watchdog_exception($type, Exception $exception, $message = NULL, $variables = array(), $severity = WATCHDOG_ERROR, $link = NULL) {
          // Use a default value if $message is not set.
          if (empty($message)) {
            // The exception message is run through check_plain() by _drupal_decode_exception().
            $message = '%type: !message in %function (line %line of %file).';
+         }
          // $variables must be an array so that we can add the exception information.
          if (!is_array($variables)) {
            $variables = array();
+         }
          require_once DRUPAL_ROOT . '/includes/errors.inc';
          $variables += _drupal_decode_exception($exception);
          watchdog($type, $message, $variables, $severity, $link);
+      }
       /**
        * Logs a system message.
+       *
        * @param $type
        *   The category to which this message belongs. Can be any string, but the
        *   general practice is to use the name of the module calling watchdog().
        * @param $message
        *   The message to store in the log. Keep $message translatable
        *   by not concatenating dynamic values into it! Variables in the
        *   message should be added by using placeholder strings alongside
        *   the variables argument to declare the value of the placeholders.
        *   See t() for documentation on how $message and $variables interact.
        * @param $variables
        *   Array of variables to replace in the message on display or
        *   NULL if message is already translated or not possible to
        *   translate.
        * @param $severity
        *   The severity of the message; one of the following values as defined in
        *   @link http://www.faqs.org/rfcs/rfc3164.html RFC 3164: @endlink
        *   - WATCHDOG_EMERGENCY: Emergency, system is unusable.
        *   - WATCHDOG_ALERT: Alert, action must be taken immediately.
        *   - WATCHDOG_CRITICAL: Critical conditions.
        *   - WATCHDOG_ERROR: Error conditions.
        *   - WATCHDOG_WARNING: Warning conditions.
        *   - WATCHDOG_NOTICE: (default) Normal but significant conditions.
        *   - WATCHDOG_INFO: Informational messages.
        *   - WATCHDOG_DEBUG: Debug-level messages.
        * @param $link
        *   A link to associate with the message.
+       *
        * @see watchdog_severity_levels()
        * @see hook_watchdog()
        */
       function watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL) {
         global $user, $base_root;
         static $in_error_state = FALSE;
         // It is possible that the error handling will itself trigger an error. In that case, we could
         // end up in an infinite loop. To avoid that, we implement a simple static semaphore.
         if (!$in_error_state && function_exists('module_invoke_all')) {
           $in_error_state = TRUE;
           // The user object may not exist in all conditions, so 0 is substituted if needed.
           $user_uid = isset($user->uid) ? $user->uid : 0;
           // Prepare the fields to be logged
           $log_entry = array(
             'type'        => $type,
             'message'     => $message,
             'variables'   => $variables,
             'severity'    => $severity,
             'link'        => $link,
             'user'        => $user,
             'uid'         => $user_uid,
             'request_uri' => $base_root . request_uri(),
             'referer'     => isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '',
             'ip'          => ip_address(),
             // Request time isn't accurate for long processes, use time() instead.
             'timestamp'   => time(),
           );
           // Call the logging hooks to log/process the message
           module_invoke_all('watchdog', $log_entry);
           // It is critical that the semaphore is only cleared here, in the parent
           // watchdog() call (not outside the loop), to prevent recursive execution.
           $in_error_state = FALSE;
+        }
+      }
       /**
        * Sets a message to display to the user.
+       *
        * Messages are stored in a session variable and displayed in page.tpl.php via
        * the $messages theme variable.
+       *
        * Example usage:
        * @code
        * drupal_set_message(t('An error occurred and processing did not complete.'), 'error');
        * @endcode
+       *
        * @param string $message
        *   (optional) The translated message to be displayed to the user. For
        *   consistency with other messages, it should begin with a capital letter and
        *   end with a period.
        * @param string $type
        *   (optional) The message's type. Defaults to 'status'. These values are
        *   supported:
        *   - 'status'
        *   - 'warning'
        *   - 'error'
        * @param bool $repeat
        *   (optional) If this is FALSE and the message is already set, then the
        *   message won't be repeated. Defaults to TRUE.
+       *
        * @return array|null
        *   A multidimensional array with keys corresponding to the set message types.
        *   The indexed array values of each contain the set messages for that type.
        *   Or, if there are no messages set, the function returns NULL.
+       *
        * @see drupal_get_messages()
        * @see theme_status_messages()
        */
       function drupal_set_message($message = NULL, $type = 'status', $repeat = TRUE) {
         if ($message || $message === '0' || $message === 0) {
           if (!isset($_SESSION['messages'][$type])) {
             $_SESSION['messages'][$type] = array();
+          }
           if ($repeat || !in_array($message, $_SESSION['messages'][$type])) {
             $_SESSION['messages'][$type][] = $message;
+          }
           // Mark this page as being uncacheable.
           drupal_page_is_cacheable(FALSE);
+        }
         // Messages not set when DB connection fails.
         return isset($_SESSION['messages']) ? $_SESSION['messages'] : NULL;
+      }
       /**
        * Returns all messages that have been set with drupal_set_message().
+       *
        * @param string $type
        *   (optional) Limit the messages returned by type. Defaults to NULL, meaning
        *   all types. These values are supported:
        *   - NULL
        *   - 'status'
        *   - 'warning'
        *   - 'error'
        * @param bool $clear_queue
        *   (optional) If this is TRUE, the queue will be cleared of messages of the
        *   type specified in the $type parameter. Otherwise the queue will be left
        *   intact. Defaults to TRUE.
+       *
        * @return array
        *   A multidimensional array with keys corresponding to the set message types.
        *   The indexed array values of each contain the set messages for that type.
        *   The messages returned are limited to the type specified in the $type
        *   parameter. If there are no messages of the specified type, an empty array
        *   is returned.
+       *
        * @see drupal_set_message()
        * @see theme_status_messages()
        */
       function drupal_get_messages($type = NULL, $clear_queue = TRUE) {
         if ($messages = drupal_set_message()) {
           if ($type) {
             if ($clear_queue) {
               unset($_SESSION['messages'][$type]);
+            }
             if (isset($messages[$type])) {
               return array($type => $messages[$type]);
+            }
+          }
           else {
             if ($clear_queue) {
               unset($_SESSION['messages']);
+            }
             return $messages;
+          }
+        }
         return array();
+      }
       /**
        * Gets the title of the current page.
+       *
        * The title is displayed on the page and in the title bar.
+       *
        * @return
        *   The current page's title.
        */
       function drupal_get_title() {
         $title = drupal_set_title();
         // During a bootstrap, menu.inc is not included and thus we cannot provide a title.
         if (!isset($title) && function_exists('menu_get_active_title')) {
           $title = check_plain(menu_get_active_title());
+        }
         return $title;
+      }
       /**
        * Sets the title of the current page.
+       *
        * The title is displayed on the page and in the title bar.
+       *
        * @param $title
        *   Optional string value to assign to the page title; or if set to NULL
        *   (default), leaves the current title unchanged.
        * @param $output
        *   Optional flag - normally should be left as CHECK_PLAIN. Only set to
        *   PASS_THROUGH if you have already removed any possibly dangerous code
        *   from $title using a function like check_plain() or filter_xss(). With this
        *   flag the string will be passed through unchanged.
+       *
        * @return
        *   The updated title of the current page.
        */
       function drupal_set_title($title = NULL, $output = CHECK_PLAIN) {
         $stored_title = &drupal_static(__FUNCTION__);
         if (isset($title)) {
           $stored_title = ($output == PASS_THROUGH) ? $title : check_plain($title);
+        }
         return $stored_title;
+      }
       /**
        * Checks to see if an IP address has been blocked.
+       *
        * Blocked IP addresses are stored in the database by default. However for
        * performance reasons we allow an override in settings.php. This allows us
        * to avoid querying the database at this critical stage of the bootstrap if
        * an administrative interface for IP address blocking is not required.
+       *
        * @param $ip
        *   IP address to check.
+       *
        * @return bool
        *   TRUE if access is denied, FALSE if access is allowed.
        */
       function drupal_is_denied($ip) {
         // Because this function is called on every page request, we first check
         // for an array of IP addresses in settings.php before querying the
         // database.
         $blocked_ips = variable_get('blocked_ips');
         $denied = FALSE;
         if (isset($blocked_ips) && is_array($blocked_ips)) {
           $denied = in_array($ip, $blocked_ips);
+        }
         // Only check if database.inc is loaded already. If
         // $conf['page_cache_without_database'] = TRUE; is set in settings.php,
         // then the database won't be loaded here so the IPs in the database
         // won't be denied. However the user asked explicitly not to use the
         // database and also in this case it's quite likely that the user relies
         // on higher performance solutions like a firewall.
         elseif (class_exists('Database', FALSE)) {
           $denied = (bool)db_query("SELECT 1 FROM {blocked_ips} WHERE ip = :ip", array(':ip' => $ip))->fetchField();
+        }
         return $denied;
+      }
       /**
        * Handles denied users.
+       *
        * @param $ip
        *   IP address to check. Prints a message and exits if access is denied.
        */
       function drupal_block_denied($ip) {
         // Deny access to blocked IP addresses - t() is not yet available.
         if (drupal_is_denied($ip)) {
           header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
           print 'Sorry, ' . check_plain(ip_address()) . ' has been banned.';
           exit();
+        }
+      }
       /**
        * Returns a URL-safe, base64 encoded string of highly randomized bytes (over the full 8-bit range).
+       *
        * @param $byte_count
        *   The number of random bytes to fetch and base64 encode.
+       *
        * @return string
        *   The base64 encoded result will have a length of up to 4 * $byte_count.
        */
       function drupal_random_key($byte_count = 32) {
         return drupal_base64_encode(drupal_random_bytes($byte_count));
+      }
       /**
        * Returns a URL-safe, base64 encoded version of the supplied string.
+       *
        * @param $string
        *   The string to convert to base64.
+       *
        * @return string
        */
       function drupal_base64_encode($string) {
         $data = base64_encode($string);
         // Modify the output so it's safe to use in URLs.
         return strtr($data, array('+' => '-', '/' => '_', '=' => ''));
+      }
       /**
        * Returns a string of highly randomized bytes (over the full 8-bit range).
+       *
        * This function is better than simply calling mt_rand() or any other built-in
        * PHP function because it can return a long string of bytes (compared to < 4
        * bytes normally from mt_rand()) and uses the best available pseudo-random
        * source.
+       *
        * @param $count
        *   The number of characters (bytes) to return in the string.
        */
       function drupal_random_bytes($count)  {
         // $random_state does not use drupal_static as it stores random bytes.
         static $random_state, $bytes, $has_openssl;
         $missing_bytes = $count - strlen($bytes);
         if ($missing_bytes > 0) {
           // PHP versions prior 5.3.4 experienced openssl_random_pseudo_bytes()
           // locking on Windows and rendered it unusable.
           if (!isset($has_openssl)) {
             $has_openssl = version_compare(PHP_VERSION, '5.3.4', '>=') && function_exists('openssl_random_pseudo_bytes');
+          }
           // openssl_random_pseudo_bytes() will find entropy in a system-dependent
           // way.
           if ($has_openssl) {
             $bytes .= openssl_random_pseudo_bytes($missing_bytes);
+          }
           // Else, read directly from /dev/urandom, which is available on many *nix
           // systems and is considered cryptographically secure.
           elseif ($fh = @fopen('/dev/urandom', 'rb')) {
             // PHP only performs buffered reads, so in reality it will always read
             // at least 4096 bytes. Thus, it costs nothing extra to read and store
             // that much so as to speed any additional invocations.
             $bytes .= fread($fh, max(4096, $missing_bytes));
             fclose($fh);
+          }
           // If we couldn't get enough entropy, this simple hash-based PRNG will
           // generate a good set of pseudo-random bytes on any system.
           // Note that it may be important that our $random_state is passed
           // through hash() prior to being rolled into $output, that the two hash()
           // invocations are different, and that the extra input into the first one -
           // the microtime() - is prepended rather than appended. This is to avoid
           // directly leaking $random_state via the $output stream, which could
           // allow for trivial prediction of further "random" numbers.
           if (strlen($bytes) < $count) {
             // Initialize on the first call. The contents of $_SERVER includes a mix of
             // user-specific and system information that varies a little with each page.
             if (!isset($random_state)) {
               $random_state = print_r($_SERVER, TRUE);
               if (function_exists('getmypid')) {
                 // Further initialize with the somewhat random PHP process ID.
                 $random_state .= getmypid();
+              }
               $bytes = '';
+            }
             do {
               $random_state = hash('sha256', microtime() . mt_rand() . $random_state);
               $bytes .= hash('sha256', mt_rand() . $random_state, TRUE);
+            }
             while (strlen($bytes) < $count);
+          }
+        }
         $output = substr($bytes, 0, $count);
         $bytes = substr($bytes, $count);
         return $output;
+      }
       /**
        * Calculates a base-64 encoded, URL-safe sha-256 hmac.
+       *
        * @param string $data
        *   String to be validated with the hmac.
        * @param string $key
        *   A secret string key.
+       *
        * @return string
        *   A base-64 encoded sha-256 hmac, with + replaced with -, / with _ and
        *   any = padding characters removed.
        */
       function drupal_hmac_base64($data, $key) {
         // Casting $data and $key to strings here is necessary to avoid empty string
         // results of the hash function if they are not scalar values. As this
         // function is used in security-critical contexts like token validation it is
         // important that it never returns an empty string.
         $hmac = base64_encode(hash_hmac('sha256', (string) $data, (string) $key, TRUE));
         // Modify the hmac so it's safe to use in URLs.
         return strtr($hmac, array('+' => '-', '/' => '_', '=' => ''));
+      }
       /**
        * Calculates a base-64 encoded, URL-safe sha-256 hash.
+       *
        * @param $data
        *   String to be hashed.
+       *
        * @return
        *   A base-64 encoded sha-256 hash, with + replaced with -, / with _ and
        *   any = padding characters removed.
        */
       function drupal_hash_base64($data) {
         $hash = base64_encode(hash('sha256', $data, TRUE));
         // Modify the hash so it's safe to use in URLs.
         return strtr($hash, array('+' => '-', '/' => '_', '=' => ''));
+      }
       /**
        * Merges multiple arrays, recursively, and returns the merged array.
+       *
        * This function is similar to PHP's array_merge_recursive() function, but it
        * handles non-array values differently. When merging values that are not both
        * arrays, the latter value replaces the former rather than merging with it.
+       *
        * Example:
        * @code
        * $link_options_1 = array('fragment' => 'x', 'attributes' => array('title' => t('X'), 'class' => array('a', 'b')));
        * $link_options_2 = array('fragment' => 'y', 'attributes' => array('title' => t('Y'), 'class' => array('c', 'd')));
+       *
        * // This results in array('fragment' => array('x', 'y'), 'attributes' => array('title' => array(t('X'), t('Y')), 'class' => array('a', 'b', 'c', 'd'))).
        * $incorrect = array_merge_recursive($link_options_1, $link_options_2);
+       *
        * // This results in array('fragment' => 'y', 'attributes' => array('title' => t('Y'), 'class' => array('a', 'b', 'c', 'd'))).
        * $correct = drupal_array_merge_deep($link_options_1, $link_options_2);
        * @endcode
+       *
        * @param ...
        *   Arrays to merge.
+       *
        * @return
        *   The merged array.
+       *
        * @see drupal_array_merge_deep_array()
        */
       function drupal_array_merge_deep() {
         $args = func_get_args();
         return drupal_array_merge_deep_array($args);
+      }
       /**
        * Merges multiple arrays, recursively, and returns the merged array.
+       *
        * This function is equivalent to drupal_array_merge_deep(), except the
        * input arrays are passed as a single array parameter rather than a variable
        * parameter list.
+       *
        * The following are equivalent:
        * - drupal_array_merge_deep($a, $b);
        * - drupal_array_merge_deep_array(array($a, $b));
+       *
        * The following are also equivalent:
        * - call_user_func_array('drupal_array_merge_deep', $arrays_to_merge);
        * - drupal_array_merge_deep_array($arrays_to_merge);
+       *
        * @see drupal_array_merge_deep()
        */
       function drupal_array_merge_deep_array($arrays) {
         $result = array();
         foreach ($arrays as $array) {
           foreach ($array as $key => $value) {
             // Renumber integer keys as array_merge_recursive() does. Note that PHP
             // automatically converts array keys that are integer strings (e.g., '1')
             // to integers.
             if (is_integer($key)) {
               $result[] = $value;
+            }
             // Recurse when both values are arrays.
             elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) {
               $result[$key] = drupal_array_merge_deep_array(array($result[$key], $value));
+            }
             // Otherwise, use the latter value, overriding any previous value.
             else {
               $result[$key] = $value;
+            }
+          }
+        }
         return $result;
+      }
       /**
        * Generates a default anonymous $user object.
+       *
        * @return Object - the user object.
        */
       function drupal_anonymous_user() {
         $user = variable_get('drupal_anonymous_user_object', new stdClass);
         $user->uid = 0;
         $user->hostname = ip_address();
         $user->roles = array();
         $user->roles[DRUPAL_ANONYMOUS_RID] = 'anonymous user';
         $user->cache = 0;
         return $user;
+      }
       /**
        * Ensures Drupal is bootstrapped to the specified phase.
+       *
        * In order to bootstrap Drupal from another PHP script, you can use this code:
        * @code
        *   define('DRUPAL_ROOT', '/path/to/drupal');
        *   require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
        *   drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
        * @endcode
+       *
        * @param int $phase
        *   A constant telling which phase to bootstrap to. When you bootstrap to a
        *   particular phase, all earlier phases are run automatically. Possible
        *   values:
        *   - DRUPAL_BOOTSTRAP_CONFIGURATION: Initializes configuration.
        *   - DRUPAL_BOOTSTRAP_PAGE_CACHE: Tries to serve a cached page.
        *   - DRUPAL_BOOTSTRAP_DATABASE: Initializes the database layer.
        *   - DRUPAL_BOOTSTRAP_VARIABLES: Initializes the variable system.
        *   - DRUPAL_BOOTSTRAP_SESSION: Initializes session handling.
        *   - DRUPAL_BOOTSTRAP_PAGE_HEADER: Sets up the page header.
        *   - DRUPAL_BOOTSTRAP_LANGUAGE: Finds out the language of the page.
        *   - DRUPAL_BOOTSTRAP_FULL: Fully loads Drupal. Validates and fixes input
        *     data.
        * @param boolean $new_phase
        *   A boolean, set to FALSE if calling drupal_bootstrap from inside a
        *   function called from drupal_bootstrap (recursion).
+       *
        * @return int
        *   The most recently completed phase.
        */
       function drupal_bootstrap($phase = NULL, $new_phase = TRUE) {
         // Not drupal_static(), because does not depend on any run-time information.
         static $phases = array(
           DRUPAL_BOOTSTRAP_CONFIGURATION,
           DRUPAL_BOOTSTRAP_PAGE_CACHE,
           DRUPAL_BOOTSTRAP_DATABASE,
           DRUPAL_BOOTSTRAP_VARIABLES,
           DRUPAL_BOOTSTRAP_SESSION,
           DRUPAL_BOOTSTRAP_PAGE_HEADER,
           DRUPAL_BOOTSTRAP_LANGUAGE,
           DRUPAL_BOOTSTRAP_FULL,
         );
         // Not drupal_static(), because the only legitimate API to control this is to
         // call drupal_bootstrap() with a new phase parameter.
         static $final_phase;
         // Not drupal_static(), because it's impossible to roll back to an earlier
         // bootstrap state.
         static $stored_phase = -1;
         if (isset($phase)) {
           // When not recursing, store the phase name so it's not forgotten while
           // recursing but take care of not going backwards.
           if ($new_phase && $phase >= $stored_phase) {
             $final_phase = $phase;
+          }
           // Call a phase if it has not been called before and is below the requested
           // phase.
           while ($phases && $phase > $stored_phase && $final_phase > $stored_phase) {
             $current_phase = array_shift($phases);
             // This function is re-entrant. Only update the completed phase when the
             // current call actually resulted in a progress in the bootstrap process.
             if ($current_phase > $stored_phase) {
               $stored_phase = $current_phase;
+            }
             switch ($current_phase) {
               case DRUPAL_BOOTSTRAP_CONFIGURATION:
                 require_once DRUPAL_ROOT . '/includes/request-sanitizer.inc';
                 _drupal_bootstrap_configuration();
                 break;
               case DRUPAL_BOOTSTRAP_PAGE_CACHE:
                 _drupal_bootstrap_page_cache();
                 break;
               case DRUPAL_BOOTSTRAP_DATABASE:
                 _drupal_bootstrap_database();
                 break;
               case DRUPAL_BOOTSTRAP_VARIABLES:
                 _drupal_bootstrap_variables();
                 break;
               case DRUPAL_BOOTSTRAP_SESSION:
                 require_once DRUPAL_ROOT . '/' . variable_get('session_inc', 'includes/session.inc');
                 drupal_session_initialize();
                 break;
               case DRUPAL_BOOTSTRAP_PAGE_HEADER:
                 _drupal_bootstrap_page_header();
                 break;
               case DRUPAL_BOOTSTRAP_LANGUAGE:
                 drupal_language_initialize();
                 break;
               case DRUPAL_BOOTSTRAP_FULL:
                 require_once DRUPAL_ROOT . '/includes/common.inc';
                 _drupal_bootstrap_full();
                 break;
+            }
+          }
+        }
         return $stored_phase;
+      }
       /**
        * Returns the time zone of the current user.
        */
       function drupal_get_user_timezone() {
         global $user;
         if (variable_get('configurable_timezones', 1) && $user->uid && $user->timezone) {
           return $user->timezone;
+        }
         else {
           // Ignore PHP strict notice if time zone has not yet been set in the php.ini
           // configuration.
           return variable_get('date_default_timezone', @date_default_timezone_get());
+        }
+      }
       /**
        * Gets a salt useful for hardening against SQL injection.
+       *
        * @return
        *   A salt based on information in settings.php, not in the database.
        */
       function drupal_get_hash_salt() {
         global $drupal_hash_salt, $databases;
         // If the $drupal_hash_salt variable is empty, a hash of the serialized
         // database credentials is used as a fallback salt.
         return empty($drupal_hash_salt) ? hash('sha256', serialize($databases)) : $drupal_hash_salt;
+      }
       /**
        * Provides custom PHP error handling.
+       *
        * @param $error_level
        *   The level of the error raised.
        * @param $message
        *   The error message.
        * @param $filename
        *   The filename that the error was raised in.
        * @param $line
        *   The line number the error was raised at.
        * @param $context
        *   An array that points to the active symbol table at the point the error
        *   occurred.
        */
       function _drupal_error_handler($error_level, $message, $filename, $line, $context) {
         require_once DRUPAL_ROOT . '/includes/errors.inc';
         _drupal_error_handler_real($error_level, $message, $filename, $line, $context);
+      }
       /**
        * Provides custom PHP exception handling.
+       *
        * Uncaught exceptions are those not enclosed in a try/catch block. They are
        * always fatal: the execution of the script will stop as soon as the exception
        * handler exits.
+       *
        * @param $exception
        *   The exception object that was thrown.
        */
       function _drupal_exception_handler($exception) {
         require_once DRUPAL_ROOT . '/includes/errors.inc';
         try {
           // Log the message to the watchdog and return an error page to the user.
           _drupal_log_error(_drupal_decode_exception($exception), TRUE);
+        }
         catch (Exception $exception2) {
           // Add a 500 status code in case an exception was thrown before the 500
           // status could be set (e.g. while loading a maintenance theme from cache).
           drupal_add_http_header('Status', '500 Internal Server Error');
           // Another uncaught exception was thrown while handling the first one.
           // If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown.
           if (error_displayable()) {
             print '<h1>Additional uncaught exception thrown while handling exception.</h1>';
             print '<h2>Original</h2><p>' . _drupal_render_exception_safe($exception) . '</p>';
             print '<h2>Additional</h2><p>' . _drupal_render_exception_safe($exception2) . '</p><hr />';
+          }
+        }
+      }
       /**
        * Sets up the script environment and loads settings.php.
        */
       function _drupal_bootstrap_configuration() {
         // Set the Drupal custom error handler.
         set_error_handler('_drupal_error_handler');
         set_exception_handler('_drupal_exception_handler');
         drupal_environment_initialize();
         // Start a page timer:
         timer_start('page');
         // Initialize the configuration, including variables from settings.php.
         drupal_settings_initialize();
         // Sanitize unsafe keys from the request.
         DrupalRequestSanitizer::sanitize();
+      }
       /**
        * Attempts to serve a page from the cache.
        */
       function _drupal_bootstrap_page_cache() {
         global $user;
         // Allow specifying special cache handlers in settings.php, like
         // using memcached or files for storing cache information.
         require_once DRUPAL_ROOT . '/includes/cache.inc';
         foreach (variable_get('cache_backends', array()) as $include) {
           require_once DRUPAL_ROOT . '/' . $include;
+        }
         // Check for a cache mode force from settings.php.
         if (variable_get('page_cache_without_database')) {
           $cache_enabled = TRUE;
+        }
         else {
           drupal_bootstrap(DRUPAL_BOOTSTRAP_VARIABLES, FALSE);
           $cache_enabled = variable_get('cache');
+        }
         drupal_block_denied(ip_address());
         // If there is no session cookie and cache is enabled (or forced), try
         // to serve a cached page.
         if (!isset($_COOKIE[session_name()]) && $cache_enabled) {
           // Make sure there is a user object because its timestamp will be
           // checked, hook_boot might check for anonymous user etc.
           $user = drupal_anonymous_user();
           // Get the page from the cache.
           $cache = drupal_page_get_cache();
           // If there is a cached page, display it.
           if (is_object($cache)) {
             header('X-Drupal-Cache: HIT');
             // Restore the metadata cached with the page.
             $_GET['q'] = $cache->data['path'];
             drupal_set_title($cache->data['title'], PASS_THROUGH);
             date_default_timezone_set(drupal_get_user_timezone());
             // If the skipping of the bootstrap hooks is not enforced, call
             // hook_boot.
             if (variable_get('page_cache_invoke_hooks', TRUE)) {
               bootstrap_invoke_all('boot');
+            }
             drupal_serve_page_from_cache($cache);
             // If the skipping of the bootstrap hooks is not enforced, call
             // hook_exit.
             if (variable_get('page_cache_invoke_hooks', TRUE)) {
               bootstrap_invoke_all('exit');
+            }
             // We are done.
             exit;
+          }
           else {
             header('X-Drupal-Cache: MISS');
+          }
+        }
+      }
       /**
        * Initializes the database system and registers autoload functions.
        */
       function _drupal_bootstrap_database() {
         // Redirect the user to the installation script if Drupal has not been
         // installed yet (i.e., if no $databases array has been defined in the
         // settings.php file) and we are not already installing.
         if (empty($GLOBALS['databases']) && !drupal_installation_attempted()) {
           include_once DRUPAL_ROOT . '/includes/install.inc';
           install_goto('install.php');
+        }
         // The user agent header is used to pass a database prefix in the request when
         // running tests. However, for security reasons, it is imperative that we
         // validate we ourselves made the request.
         if ($test_prefix = drupal_valid_test_ua()) {
           // Set the test run id for use in other parts of Drupal.
           $test_info = &$GLOBALS['drupal_test_info'];
           $test_info['test_run_id'] = $test_prefix;
           $test_info['in_child_site'] = TRUE;
           foreach ($GLOBALS['databases']['default'] as &$value) {
             // Extract the current default database prefix.
             if (!isset($value['prefix'])) {
               $current_prefix = '';
+            }
             elseif (is_array($value['prefix'])) {
               $current_prefix = $value['prefix']['default'];
+            }
             else {
               $current_prefix = $value['prefix'];
+            }
             // Remove the current database prefix and replace it by our own.
             $value['prefix'] = array(
               'default' => $current_prefix . $test_prefix,
             );
+          }
+        }
         // Initialize the database system. Note that the connection
         // won't be initialized until it is actually requested.
         require_once DRUPAL_ROOT . '/includes/database/database.inc';
         // Register autoload functions so that we can access classes and interfaces.
         // The database autoload routine comes first so that we can load the database
         // system without hitting the database. That is especially important during
         // the install or upgrade process.
         spl_autoload_register('drupal_autoload_class');
         spl_autoload_register('drupal_autoload_interface');
         if (version_compare(PHP_VERSION, '5.4') >= 0) {
           spl_autoload_register('drupal_autoload_trait');
+        }
+      }
       /**
        * Loads system variables and all enabled bootstrap modules.
        */
       function _drupal_bootstrap_variables() {
         global $conf;
         // Initialize the lock system.
         require_once DRUPAL_ROOT . '/' . variable_get('lock_inc', 'includes/lock.inc');
         lock_initialize();
         // Load variables from the database, but do not overwrite variables set in settings.php.
         $conf = variable_initialize(isset($conf) ? $conf : array());
         // Load bootstrap modules.
         require_once DRUPAL_ROOT . '/includes/module.inc';
         module_load_all(TRUE);
         // Sanitize the destination parameter (which is often used for redirects) to
         // prevent open redirect attacks leading to other domains. Sanitize both
         // $_GET['destination'] and $_REQUEST['destination'] to protect code that
         // relies on either, but do not sanitize $_POST to avoid interfering with
         // unrelated form submissions. The sanitization happens here because
         // url_is_external() requires the variable system to be available.
         if (isset($_GET['destination']) || isset($_REQUEST['destination'])) {
           require_once DRUPAL_ROOT . '/includes/common.inc';
           // If the destination is an external URL, remove it.
           if (isset($_GET['destination']) && url_is_external($_GET['destination'])) {
             unset($_GET['destination']);
             unset($_REQUEST['destination']);
+          }
           // Use the DrupalRequestSanitizer to ensure that the destination's query
           // parameters are not dangerous.
           if (isset($_GET['destination'])) {
             DrupalRequestSanitizer::cleanDestination();
+          }
           // If there's still something in $_REQUEST['destination'] that didn't come
           // from $_GET, check it too.
           if (isset($_REQUEST['destination']) && (!isset($_GET['destination']) || $_REQUEST['destination'] != $_GET['destination']) && url_is_external($_REQUEST['destination'])) {
             unset($_REQUEST['destination']);
+          }
+        }
+      }
       /**
        * Invokes hook_boot(), initializes locking system, and sends HTTP headers.
        */
       function _drupal_bootstrap_page_header() {
         bootstrap_invoke_all('boot');
         if (!drupal_is_cli()) {
           ob_start();
           drupal_page_header();
+        }
+      }
       /**
        * Returns the current bootstrap phase for this Drupal process.
+       *
        * The current phase is the one most recently completed by drupal_bootstrap().
+       *
        * @see drupal_bootstrap()
        */
       function drupal_get_bootstrap_phase() {
         return drupal_bootstrap(NULL, FALSE);
+      }
       /**
        * Returns the test prefix if this is an internal request from SimpleTest.
+       *
        * @return
        *   Either the simpletest prefix (the string "simpletest" followed by any
        *   number of digits) or FALSE if the user agent does not contain a valid
        *   HMAC and timestamp.
        */
       function drupal_valid_test_ua() {
         // No reason to reset this.
         static $test_prefix;
         if (isset($test_prefix)) {
           return $test_prefix;
+        }
         if (isset($_SERVER['HTTP_USER_AGENT']) && preg_match("/^(simpletest\d+);(.+);(.+);(.+)$/", $_SERVER['HTTP_USER_AGENT'], $matches)) {
           list(, $prefix, $time, $salt, $hmac) = $matches;
           $check_string =  $prefix . ';' . $time . ';' . $salt;
           // We use the salt from settings.php to make the HMAC key, since
           // the database is not yet initialized and we can't access any Drupal variables.
           // The file properties add more entropy not easily accessible to others.
           $key = drupal_get_hash_salt() . filectime(__FILE__) . fileinode(__FILE__);
           $time_diff = REQUEST_TIME - $time;
           // Since we are making a local request a 5 second time window is allowed,
           // and the HMAC must match.
           if ($time_diff >= 0 && $time_diff <= 5 && $hmac == drupal_hmac_base64($check_string, $key)) {
             $test_prefix = $prefix;
             return $test_prefix;
+          }
+        }
         $test_prefix = FALSE;
         return $test_prefix;
+      }
       /**
        * Generates a user agent string with a HMAC and timestamp for simpletest.
        */
       function drupal_generate_test_ua($prefix) {
         static $key;
         if (!isset($key)) {
           // We use the salt from settings.php to make the HMAC key, since
           // the database is not yet initialized and we can't access any Drupal variables.
           // The file properties add more entropy not easily accessible to others.
           $key = drupal_get_hash_salt() . filectime(__FILE__) . fileinode(__FILE__);
+        }
         // Generate a moderately secure HMAC based on the database credentials.
         $salt = uniqid('', TRUE);
         $check_string = $prefix . ';' . time() . ';' . $salt;
         return $check_string . ';' . drupal_hmac_base64($check_string, $key);
+      }
       /**
        * Enables use of the theme system without requiring database access.
+       *
        * Loads and initializes the theme system for site installs, updates and when
        * the site is in maintenance mode. This also applies when the database fails.
+       *
        * @see _drupal_maintenance_theme()
        */
       function drupal_maintenance_theme() {
         require_once DRUPAL_ROOT . '/includes/theme.maintenance.inc';
         _drupal_maintenance_theme();
+      }
       /**
        * Returns a simple 404 Not Found page.
+       *
        * If fast 404 pages are enabled, and this is a matching page then print a
        * simple 404 page and exit.
+       *
        * This function is called from drupal_deliver_html_page() at the time when a
        * a normal 404 page is generated, but it can also optionally be called directly
        * from settings.php to prevent a Drupal bootstrap on these pages. See
        * documentation in settings.php for the benefits and drawbacks of using this.
+       *
        * Paths to dynamically-generated content, such as image styles, should also be
        * accounted for in this function.
        */
       function drupal_fast_404() {
         $exclude_paths = variable_get('404_fast_paths_exclude', FALSE);
         if ($exclude_paths && !preg_match($exclude_paths, $_GET['q'])) {
           $fast_paths = variable_get('404_fast_paths', FALSE);
           if ($fast_paths && preg_match($fast_paths, $_GET['q'])) {
             drupal_add_http_header('Status', '404 Not Found');
             $fast_404_html = variable_get('404_fast_html', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>');
             // Replace @path in the variable with the page path.
             print strtr($fast_404_html, array('@path' => check_plain(request_uri())));
             exit;
+          }
+        }
+      }
       /**
        * Returns TRUE if a Drupal installation is currently being attempted.
        */
       function drupal_installation_attempted() {
         return defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'install';
+      }
       /**
        * Returns the name of the proper localization function.
+       *
        * get_t() exists to support localization for code that might run during
        * the installation phase, when some elements of the system might not have
        * loaded.
+       *
        * This would include implementations of hook_install(), which could run
        * during the Drupal installation phase, and might also be run during
        * non-installation time, such as while installing the module from the
        * module administration page.
+       *
        * Example usage:
        * @code
        *   $t = get_t();
        *   $translated = $t('translate this');
        * @endcode
+       *
        * Use t() if your code will never run during the Drupal installation phase.
        * Use st() if your code will only run during installation and never any other
        * time. Use get_t() if your code could run in either circumstance.
+       *
        * @see t()
        * @see st()
        * @ingroup sanitization
        */
       function get_t() {
         static $t;
         // This is not converted to drupal_static because there is no point in
         // resetting this as it can not change in the course of a request.
         if (!isset($t)) {
           $t = drupal_installation_attempted() ? 'st' : 't';
+        }
         return $t;
+      }
       /**
        * Initializes all the defined language types.
        */
       function drupal_language_initialize() {
         $types = language_types();
         // Ensure the language is correctly returned, even without multilanguage
         // support. Also make sure we have a $language fallback, in case a language
         // negotiation callback needs to do a full bootstrap.
         // Useful for eg. XML/HTML 'lang' attributes.
         $default = language_default();
         foreach ($types as $type) {
           $GLOBALS[$type] = $default;
+        }
         if (drupal_multilingual()) {
           include_once DRUPAL_ROOT . '/includes/language.inc';
           foreach ($types as $type) {
             $GLOBALS[$type] = language_initialize($type);
+          }
           // Allow modules to react on language system initialization in multilingual
           // environments.
           bootstrap_invoke_all('language_init');
+        }
+      }
       /**
        * Returns a list of the built-in language types.
+       *
        * @return
        *   An array of key-values pairs where the key is the language type and the
        *   value is its configurability.
        */
       function drupal_language_types() {
         return array(
           LANGUAGE_TYPE_INTERFACE => TRUE,
           LANGUAGE_TYPE_CONTENT => FALSE,
           LANGUAGE_TYPE_URL => FALSE,
         );
+      }
       /**
        * Returns TRUE if there is more than one language enabled.
+       *
        * @return
        *   TRUE if more than one language is enabled.
        */
       function drupal_multilingual() {
         // The "language_count" variable stores the number of enabled languages to
         // avoid unnecessarily querying the database when building the list of
         // enabled languages on monolingual sites.
         return variable_get('language_count', 1) > 1;
+      }
       /**
        * Returns an array of the available language types.
+       *
        * @return
        *   An array of all language types where the keys of each are the language type
        *   name and its value is its configurability (TRUE/FALSE).
        */
       function language_types() {
         return array_keys(variable_get('language_types', drupal_language_types()));
+      }
       /**
        * Returns a list of installed languages, indexed by the specified key.
+       *
        * @param $field
        *   (optional) The field to index the list with.
+       *
        * @return
        *   An associative array, keyed on the values of $field.
        *   - If $field is 'weight' or 'enabled', the array is nested, with the outer
        *     array's values each being associative arrays with language codes as
        *     keys and language objects as values.
        *   - For all other values of $field, the array is only one level deep, and
        *     the array's values are language objects.
        */
       function language_list($field = 'language') {
         $languages = &drupal_static(__FUNCTION__);
         // Init language list
         if (!isset($languages)) {
           if (drupal_multilingual() || module_exists('locale')) {
             $languages['language'] = db_query('SELECT * FROM {languages} ORDER BY weight ASC, name ASC')->fetchAllAssoc('language');
             // Users cannot uninstall the native English language. However, we allow
             // it to be hidden from the installed languages. Therefore, at least one
             // other language must be enabled then.
             if (!$languages['language']['en']->enabled && !variable_get('language_native_enabled', TRUE)) {
               unset($languages['language']['en']);
+            }
+          }
           else {
             // No locale module, so use the default language only.
             $default = language_default();
             $languages['language'][$default->language] = $default;
+          }
+        }
         // Return the array indexed by the right field
         if (!isset($languages[$field])) {
           $languages[$field] = array();
           foreach ($languages['language'] as $lang) {
             // Some values should be collected into an array
             if (in_array($field, array('enabled', 'weight'))) {
               $languages[$field][$lang->$field][$lang->language] = $lang;
+            }
             else {
               $languages[$field][$lang->$field] = $lang;
+            }
+          }
+        }
         return $languages[$field];
+      }
       /**
        * Returns the default language, as an object, or one of its properties.
+       *
        * @param $property
        *   (optional) The property of the language object to return.
+       *
        * @return
        *   Either the language object for the default language used on the site,
        *   or the property of that object named in the $property parameter.
        */
       function language_default($property = NULL) {
         $language = variable_get('language_default', (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0, 'javascript' => ''));
         return $property ? $language->$property : $language;
+      }
       /**
        * Returns the requested URL path of the page being viewed.
+       *
        * Examples:
        * - http://example.com/node/306 returns "node/306".
        * - http://example.com/drupalfolder/node/306 returns "node/306" while
        *   base_path() returns "/drupalfolder/".
        * - http://example.com/path/alias (which is a path alias for node/306) returns
        *   "path/alias" as opposed to the internal path.
        * - http://example.com/index.php returns an empty string (meaning: front page).
        * - http://example.com/index.php?page=1 returns an empty string.
+       *
        * @return
        *   The requested Drupal URL path.
+       *
        * @see current_path()
        */
       function request_path() {
         static $path;
         if (isset($path)) {
           return $path;
+        }
         if (isset($_GET['q']) && is_string($_GET['q'])) {
           // This is a request with a ?q=foo/bar query string. $_GET['q'] is
           // overwritten in drupal_path_initialize(), but request_path() is called
           // very early in the bootstrap process, so the original value is saved in
           // $path and returned in later calls.
           $path = $_GET['q'];
+        }
         elseif (isset($_SERVER['REQUEST_URI'])) {
           // This request is either a clean URL, or 'index.php', or nonsense.
           // Extract the path from REQUEST_URI.
           $request_path = strtok($_SERVER['REQUEST_URI'], '?');
           $base_path_len = strlen(rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/'));
           // Unescape and strip $base_path prefix, leaving q without a leading slash.
           $path = substr(urldecode($request_path), $base_path_len + 1);
           // If the path equals the script filename, either because 'index.php' was
           // explicitly provided in the URL, or because the server added it to
           // $_SERVER['REQUEST_URI'] even when it wasn't provided in the URL (some
           // versions of Microsoft IIS do this), the front page should be served.
           if ($path == basename($_SERVER['PHP_SELF'])) {
             $path = '';
+          }
+        }
         else {
           // This is the front page.
           $path = '';
+        }
         // Under certain conditions Apache's RewriteRule directive prepends the value
         // assigned to $_GET['q'] with a slash. Moreover we can always have a trailing
         // slash in place, hence we need to normalize $_GET['q'].
         $path = trim($path, '/');
         return $path;
+      }
       /**
        * Returns a component of the current Drupal path.
+       *
        * When viewing a page at the path "admin/structure/types", for example, arg(0)
        * returns "admin", arg(1) returns "structure", and arg(2) returns "types".
+       *
        * Avoid use of this function where possible, as resulting code is hard to
        * read. In menu callback functions, attempt to use named arguments. See the
        * explanation in menu.inc for how to construct callbacks that take arguments.
        * When attempting to use this function to load an element from the current
        * path, e.g. loading the node on a node page, use menu_get_object() instead.
+       *
        * @param $index
        *   The index of the component, where each component is separated by a '/'
        *   (forward-slash), and where the first component has an index of 0 (zero).
        * @param $path
        *   A path to break into components. Defaults to the path of the current page.
+       *
        * @return
        *   The component specified by $index, or NULL if the specified component was
        *   not found. If called without arguments, it returns an array containing all
        *   the components of the current path.
        */
       function arg($index = NULL, $path = NULL) {
         // Even though $arguments doesn't need to be resettable for any functional
         // reasons (the result of explode() does not depend on any run-time
         // information), it should be resettable anyway in case a module needs to
         // free up the memory used by it.
         // Use the advanced drupal_static() pattern, since this is called very often.
         static $drupal_static_fast;
         if (!isset($drupal_static_fast)) {
           $drupal_static_fast['arguments'] = &drupal_static(__FUNCTION__);
+        }
         $arguments = &$drupal_static_fast['arguments'];
         if (!isset($path)) {
           $path = $_GET['q'];
+        }
         if (!isset($arguments[$path])) {
           $arguments[$path] = explode('/', $path);
+        }
         if (!isset($index)) {
           return $arguments[$path];
+        }
         if (isset($arguments[$path][$index])) {
           return $arguments[$path][$index];
+        }
+      }
       /**
        * Returns the IP address of the client machine.
+       *
        * If Drupal is behind a reverse proxy, we use the X-Forwarded-For header
        * instead of $_SERVER['REMOTE_ADDR'], which would be the IP address of
        * the proxy server, and not the client's. The actual header name can be
        * configured by the reverse_proxy_header variable.
+       *
        * @return
        *   IP address of client machine, adjusted for reverse proxy and/or cluster
        *   environments.
        */
       function ip_address() {
         $ip_address = &drupal_static(__FUNCTION__);
         if (!isset($ip_address)) {
           $ip_address = $_SERVER['REMOTE_ADDR'];
           if (variable_get('reverse_proxy', 0)) {
             $reverse_proxy_header = variable_get('reverse_proxy_header', 'HTTP_X_FORWARDED_FOR');
             if (!empty($_SERVER[$reverse_proxy_header])) {
               // If an array of known reverse proxy IPs is provided, then trust
               // the XFF header if request really comes from one of them.
               $reverse_proxy_addresses = variable_get('reverse_proxy_addresses', array());
               // Turn XFF header into an array.
               $forwarded = explode(',', $_SERVER[$reverse_proxy_header]);
               // Trim the forwarded IPs; they may have been delimited by commas and spaces.
               $forwarded = array_map('trim', $forwarded);
               // Tack direct client IP onto end of forwarded array.
               $forwarded[] = $ip_address;
               // Eliminate all trusted IPs.
               $untrusted = array_diff($forwarded, $reverse_proxy_addresses);
               if (!empty($untrusted)) {
                 // The right-most IP is the most specific we can trust.
                 $ip_address = array_pop($untrusted);
+              }
               else {
                 // All IP addresses in the forwarded array are configured proxy IPs
                 // (and thus trusted). We take the leftmost IP.
                 $ip_address = array_shift($forwarded);
+              }
+            }
+          }
+        }
         return $ip_address;
+      }
       /**
        * @addtogroup schemaapi
        * @{
        */
       /**
        * Gets the schema definition of a table, or the whole database schema.
+       *
        * The returned schema will include any modifications made by any
        * module that implements hook_schema_alter(). To get the schema without
        * modifications, use drupal_get_schema_unprocessed().
+       *
+       *
        * @param $table
        *   The name of the table. If not given, the schema of all tables is returned.
        * @param $rebuild
        *   If true, the schema will be rebuilt instead of retrieved from the cache.
        */
       function drupal_get_schema($table = NULL, $rebuild = FALSE) {
         static $schema;
         if ($rebuild || !isset($table)) {
           $schema = drupal_get_complete_schema($rebuild);
+        }
         elseif (!isset($schema)) {
           $schema = new SchemaCache();
+        }
         if (!isset($table)) {
           return $schema;
+        }
         if (isset($schema[$table])) {
           return $schema[$table];
+        }
         else {
           return FALSE;
+        }
+      }
       /**
        * Extends DrupalCacheArray to allow for dynamic building of the schema cache.
        */
       class SchemaCache extends DrupalCacheArray {
         /**
          * Constructs a SchemaCache object.
          */
         public function __construct() {
           // Cache by request method.
           parent::__construct('schema:runtime:' . ($_SERVER['REQUEST_METHOD'] == 'GET'), 'cache');
+        }
         /**
          * Overrides DrupalCacheArray::resolveCacheMiss().
          */
         protected function resolveCacheMiss($offset) {
           $complete_schema = drupal_get_complete_schema();
           $value = isset($complete_schema[$offset]) ? $complete_schema[$offset] :  NULL;
           $this->storage[$offset] = $value;
           $this->persist($offset);
           return $value;
+        }
+      }
       /**
        * Gets the whole database schema.
+       *
        * The returned schema will include any modifications made by any
        * module that implements hook_schema_alter().
+       *
        * @param $rebuild
        *   If true, the schema will be rebuilt instead of retrieved from the cache.
        */
       function drupal_get_complete_schema($rebuild = FALSE) {
         static $schema = array();
         if (empty($schema) || $rebuild) {
           // Try to load the schema from cache.
           if (!$rebuild && $cached = cache_get('schema')) {
             $schema = $cached->data;
+          }
           // Otherwise, rebuild the schema cache.
           else {
             $schema = array();
             // Load the .install files to get hook_schema.
             // On some databases this function may be called before bootstrap has
             // been completed, so we force the functions we need to load just in case.
             if (function_exists('module_load_all_includes')) {
               // This function can be called very early in the bootstrap process, so
               // we force the module_list() cache to be refreshed to ensure that it
               // contains the complete list of modules before we go on to call
               // module_load_all_includes().
               module_list(TRUE);
               module_load_all_includes('install');
+            }
             require_once DRUPAL_ROOT . '/includes/common.inc';
             // Invoke hook_schema for all modules.
             foreach (module_implements('schema') as $module) {
               // Cast the result of hook_schema() to an array, as a NULL return value
               // would cause array_merge() to set the $schema variable to NULL as well.
               // That would break modules which use $schema further down the line.
               $current = (array) module_invoke($module, 'schema');
               // Set 'module' and 'name' keys for each table, and remove descriptions,
               // as they needlessly slow down cache_get() for every single request.
               _drupal_schema_initialize($current, $module);
               $schema = array_merge($schema, $current);
+            }
             drupal_alter('schema', $schema);
             // If the schema is empty, avoid saving it: some database engines require
             // the schema to perform queries, and this could lead to infinite loops.
             if (!empty($schema) && (drupal_get_bootstrap_phase() == DRUPAL_BOOTSTRAP_FULL)) {
               cache_set('schema', $schema);
+            }
             if ($rebuild) {
               cache_clear_all('schema:', 'cache', TRUE);
+            }
+          }
+        }
         return $schema;
+      }
       /**
        * @} End of "addtogroup schemaapi".
        */
       /**
        * @addtogroup registry
        * @{
        */
       /**
        * Confirms that an interface is available.
+       *
        * This function is rarely called directly. Instead, it is registered as an
        * spl_autoload()  handler, and PHP calls it for us when necessary.
+       *
        * @param $interface
        *   The name of the interface to check or load.
+       *
        * @return
        *   TRUE if the interface is currently available, FALSE otherwise.
        */
       function drupal_autoload_interface($interface) {
         return _registry_check_code('interface', $interface);
+      }
       /**
        * Confirms that a class is available.
+       *
        * This function is rarely called directly. Instead, it is registered as an
        * spl_autoload()  handler, and PHP calls it for us when necessary.
+       *
        * @param $class
        *   The name of the class to check or load.
+       *
        * @return
        *   TRUE if the class is currently available, FALSE otherwise.
        */
       function drupal_autoload_class($class) {
         return _registry_check_code('class', $class);
+      }
       /**
        * Confirms that a trait is available.
+       *
        * This function is rarely called directly. Instead, it is registered as an
        * spl_autoload() handler, and PHP calls it for us when necessary.
+       *
        * @param string $trait
        *   The name of the trait to check or load.
+       *
        * @return bool
        *   TRUE if the trait is currently available, FALSE otherwise.
        */
       function drupal_autoload_trait($trait) {
         return _registry_check_code('trait', $trait);
+      }
       /**
        * Checks for a resource in the registry.
+       *
        * @param $type
        *   The type of resource we are looking up, or one of the constants
        *   REGISTRY_RESET_LOOKUP_CACHE or REGISTRY_WRITE_LOOKUP_CACHE, which
        *   signal that we should reset or write the cache, respectively.
        * @param $name
        *   The name of the resource, or NULL if either of the REGISTRY_* constants
        *   is passed in.
+       *
        * @return
        *   TRUE if the resource was found, FALSE if not.
        *   NULL if either of the REGISTRY_* constants is passed in as $type.
        */
       function _registry_check_code($type, $name = NULL) {
         static $lookup_cache, $cache_update_needed;
         if ($type == 'class' && class_exists($name) || $type == 'interface' && interface_exists($name) || $type == 'trait' && trait_exists($name)) {
           return TRUE;
+        }
         if (!isset($lookup_cache)) {
           $lookup_cache = array();
           if ($cache = cache_get('lookup_cache', 'cache_bootstrap')) {
             $lookup_cache = $cache->data;
+          }
+        }
         // When we rebuild the registry, we need to reset this cache so
         // we don't keep lookups for resources that changed during the rebuild.
         if ($type == REGISTRY_RESET_LOOKUP_CACHE) {
           $cache_update_needed = TRUE;
           $lookup_cache = NULL;
           return;
+        }
         // Called from drupal_page_footer, we write to permanent storage if there
         // changes to the lookup cache for this request.
         if ($type == REGISTRY_WRITE_LOOKUP_CACHE) {
           if ($cache_update_needed) {
             cache_set('lookup_cache', $lookup_cache, 'cache_bootstrap');
+          }
           return;
+        }
         // $type is either 'interface' or 'class', so we only need the first letter to
         // keep the cache key unique.
         $cache_key = $type[0] . $name;
         if (isset($lookup_cache[$cache_key])) {
           if ($lookup_cache[$cache_key]) {
             include_once DRUPAL_ROOT . '/' . $lookup_cache[$cache_key];
+          }
           return (bool) $lookup_cache[$cache_key];
+        }
         // This function may get called when the default database is not active, but
         // there is no reason we'd ever want to not use the default database for
         // this query.
         $file = Database::getConnection('default', 'default')
           ->select('registry', 'r', array('target' => 'default'))
           ->fields('r', array('filename'))
           // Use LIKE here to make the query case-insensitive.
           ->condition('r.name', db_like($name), 'LIKE')
           ->condition('r.type', $type)
           ->execute()
           ->fetchField();
         // Flag that we've run a lookup query and need to update the cache.
         $cache_update_needed = TRUE;
         // Misses are valuable information worth caching, so cache even if
         // $file is FALSE.
         $lookup_cache[$cache_key] = $file;
         if ($file) {
           include_once DRUPAL_ROOT . '/' . $file;
           return TRUE;
+        }
         else {
           return FALSE;
+        }
+      }
       /**
        * Rescans all enabled modules and rebuilds the registry.
+       *
        * Rescans all code in modules or includes directories, storing the location of
        * each interface or class in the database.
        */
       function registry_rebuild() {
         system_rebuild_module_data();
         registry_update();
+      }
       /**
        * Updates the registry based on the latest files listed in the database.
+       *
        * This function should be used when system_rebuild_module_data() does not need
        * to be called, because it is already known that the list of files in the
        * {system} table matches those in the file system.
+       *
        * @return
        *   TRUE if the registry was rebuilt, FALSE if another thread was rebuilding
        *   in parallel and the current thread just waited for completion.
+       *
        * @see registry_rebuild()
        */
       function registry_update() {
         // install_system_module() calls module_enable() which calls into this
         // function during initial system installation, so the lock system is neither
         // loaded nor does its storage exist yet.
         $in_installer = drupal_installation_attempted();
         if (!$in_installer && !lock_acquire(__FUNCTION__)) {
           // Another request got the lock, wait for it to finish.
           lock_wait(__FUNCTION__);
           return FALSE;
+        }
         require_once DRUPAL_ROOT . '/includes/registry.inc';
         _registry_update();
         if (!$in_installer) {
           lock_release(__FUNCTION__);
+        }
         return TRUE;
+      }
       /**
        * @} End of "addtogroup registry".
        */
       /**
        * Provides central static variable storage.
+       *
        * All functions requiring a static variable to persist or cache data within
        * a single page request are encouraged to use this function unless it is
        * absolutely certain that the static variable will not need to be reset during
        * the page request. By centralizing static variable storage through this
        * function, other functions can rely on a consistent API for resetting any
        * other function's static variables.
+       *
        * Example:
        * @code
        * function language_list($field = 'language') {
        *   $languages = &drupal_static(__FUNCTION__);
        *   if (!isset($languages)) {
        *     // If this function is being called for the first time after a reset,
        *     // query the database and execute any other code needed to retrieve
        *     // information about the supported languages.
        *     ...
        *   }
        *   if (!isset($languages[$field])) {
        *     // If this function is being called for the first time for a particular
        *     // index field, then execute code needed to index the information already
        *     // available in $languages by the desired field.
        *     ...
        *   }
        *   // Subsequent invocations of this function for a particular index field
        *   // skip the above two code blocks and quickly return the already indexed
        *   // information.
        *   return $languages[$field];
        * }
        * function locale_translate_overview_screen() {
        *   // When building the content for the translations overview page, make
        *   // sure to get completely fresh information about the supported languages.
        *   drupal_static_reset('language_list');
        *   ...
        * }
        * @endcode
+       *
        * In a few cases, a function can have certainty that there is no legitimate
        * use-case for resetting that function's static variable. This is rare,
        * because when writing a function, it's hard to forecast all the situations in
        * which it will be used. A guideline is that if a function's static variable
        * does not depend on any information outside of the function that might change
        * during a single page request, then it's ok to use the "static" keyword
        * instead of the drupal_static() function.
+       *
        * Example:
        * @code
        * function actions_do(...) {
        *   // $stack tracks the number of recursive calls.
        *   static $stack;
        *   $stack++;
        *   if ($stack > variable_get('actions_max_stack', 35)) {
        *     ...
        *     return;
        *   }
        *   ...
        *   $stack--;
        * }
        * @endcode
+       *
        * In a few cases, a function needs a resettable static variable, but the
        * function is called many times (100+) during a single page request, so
        * every microsecond of execution time that can be removed from the function
        * counts. These functions can use a more cumbersome, but faster variant of
        * calling drupal_static(). It works by storing the reference returned by
        * drupal_static() in the calling function's own static variable, thereby
        * removing the need to call drupal_static() for each iteration of the function.
        * Conceptually, it replaces:
        * @code
        * $foo = &drupal_static(__FUNCTION__);
        * @endcode
        * with:
        * @code
        * // Unfortunately, this does not work.
        * static $foo = &drupal_static(__FUNCTION__);
        * @endcode
        * However, the above line of code does not work, because PHP only allows static
        * variables to be initializied by literal values, and does not allow static
        * variables to be assigned to references.
        * - http://php.net/manual/language.variables.scope.php#language.variables.scope.static
        * - http://php.net/manual/language.variables.scope.php#language.variables.scope.references
        * The example below shows the syntax needed to work around both limitations.
        * For benchmarks and more information, see http://drupal.org/node/619666.
+       *
        * Example:
        * @code
        * function user_access($string, $account = 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['perm'] = &drupal_static(__FUNCTION__);
        *   }
        *   $perm = &$drupal_static_fast['perm'];
        *   ...
        * }
        * @endcode
+       *
        * @param $name
        *   Globally unique name for the variable. For a function with only one static,
        *   variable, the function name (e.g. via the PHP magic __FUNCTION__ constant)
        *   is recommended. For a function with multiple static variables add a
        *   distinguishing suffix to the function name for each one.
        * @param $default_value
        *   Optional default value.
        * @param $reset
        *   TRUE to reset one or all variables(s). This parameter is only used
        *   internally and should not be passed in; use drupal_static_reset() instead.
        *   (This function's return value should not be used when TRUE is passed in.)
+       *
        * @return
        *   Returns a variable by reference.
+       *
        * @see drupal_static_reset()
        */
       function &drupal_static($name, $default_value = NULL, $reset = FALSE) {
         static $data = array(), $default = array();
         // First check if dealing with a previously defined static variable.
         if (isset($data[$name]) || array_key_exists($name, $data)) {
           // Non-NULL $name and both $data[$name] and $default[$name] statics exist.
           if ($reset) {
             // Reset pre-existing static variable to its default value.
             $data[$name] = $default[$name];
+          }
           return $data[$name];
+        }
         // Neither $data[$name] nor $default[$name] static variables exist.
         if (isset($name)) {
           if ($reset) {
             // Reset was called before a default is set and yet a variable must be
             // returned.
             return $data;
+          }
           // First call with new non-NULL $name. Initialize a new static variable.
           $default[$name] = $data[$name] = $default_value;
           return $data[$name];
+        }
         // Reset all: ($name == NULL). This needs to be done one at a time so that
         // references returned by earlier invocations of drupal_static() also get
         // reset.
         foreach ($default as $name => $value) {
           $data[$name] = $value;
+        }
         // As the function returns a reference, the return should always be a
         // variable.
         return $data;
+      }
       /**
        * Resets one or all centrally stored static variable(s).
+       *
        * @param $name
        *   Name of the static variable to reset. Omit to reset all variables.
        *   Resetting all variables should only be used, for example, for running unit
        *   tests with a clean environment.
        */
       function drupal_static_reset($name = NULL) {
         drupal_static($name, NULL, TRUE);
+      }
       /**
        * Detects whether the current script is running in a command-line environment.
        */
       function drupal_is_cli() {
         return (!isset($_SERVER['SERVER_SOFTWARE']) && (php_sapi_name() == 'cli' || (is_numeric($_SERVER['argc']) && $_SERVER['argc'] > 0)));
+      }
       /**
        * Formats text for emphasized display in a placeholder inside a sentence.
+       *
        * Used automatically by format_string().
+       *
        * @param $text
        *   The text to format (plain-text).
+       *
        * @return
        *   The formatted text (html).
        */
       function drupal_placeholder($text) {
         return '<em class="placeholder">' . check_plain($text) . '</em>';
+      }
       /**
        * Registers a function for execution on shutdown.
+       *
        * Wrapper for register_shutdown_function() that catches thrown exceptions to
        * avoid "Exception thrown without a stack frame in Unknown".
+       *
        * @param $callback
        *   The shutdown function to register.
        * @param ...
        *   Additional arguments to pass to the shutdown function.
+       *
        * @return
        *   Array of shutdown functions to be executed.
+       *
        * @see register_shutdown_function()
        * @ingroup php_wrappers
        */
       function &drupal_register_shutdown_function($callback = NULL) {
         // We cannot use drupal_static() here because the static cache is reset during
         // batch processing, which breaks batch handling.
         static $callbacks = array();
         if (isset($callback)) {
           // Only register the internal shutdown function once.
           if (empty($callbacks)) {
             register_shutdown_function('_drupal_shutdown_function');
+          }
           $args = func_get_args();
           array_shift($args);
           // Save callback and arguments
           $callbacks[] = array('callback' => $callback, 'arguments' => $args);
+        }
         return $callbacks;
+      }
       /**
        * Executes registered shutdown functions.
        */
       function _drupal_shutdown_function() {
         $callbacks = &drupal_register_shutdown_function();
         // Set the CWD to DRUPAL_ROOT as it is not guaranteed to be the same as it
         // was in the normal context of execution.
         chdir(DRUPAL_ROOT);
         try {
           // Manually iterate over the array instead of using a foreach loop.
           // A foreach operates on a copy of the array, so any shutdown functions that
           // were added from other shutdown functions would never be called.
           while ($callback = current($callbacks)) {
             call_user_func_array($callback['callback'], $callback['arguments']);
             next($callbacks);
+          }
+        }
         catch (Exception $exception) {
           // If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown.
          require_once DRUPAL_ROOT . '/includes/errors.inc';
          if (error_displayable()) {
             print '<h1>Uncaught exception thrown in shutdown function.</h1>';
             print '<p>' . _drupal_render_exception_safe($exception) . '</p><hr />';
+          }
+        }
+      }
       /**
        * Compares the memory required for an operation to the available memory.
+       *
        * @param $required
        *   The memory required for the operation, expressed as a number of bytes with
        *   optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8bytes,
        *   9mbytes).
        * @param $memory_limit
        *   (optional) The memory limit for the operation, expressed as a number of
        *   bytes with optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G,
        *   6GiB, 8bytes, 9mbytes). If no value is passed, the current PHP
        *   memory_limit will be used. Defaults to NULL.
+       *
        * @return
        *   TRUE if there is sufficient memory to allow the operation, or FALSE
        *   otherwise.
        */
       function drupal_check_memory_limit($required, $memory_limit = NULL) {
         if (!isset($memory_limit)) {
           $memory_limit = ini_get('memory_limit');
+        }
         // There is sufficient memory if:
         // - No memory limit is set.
         // - The memory limit is set to unlimited (-1).
         // - The memory limit is greater than the memory required for the operation.
         return ((!$memory_limit) || ($memory_limit == -1) || (parse_size($memory_limit) >= parse_size($required)));
+      }
       /**
        * Invalidates a PHP file from any active opcode caches.
+       *
        * If the opcode cache does not support the invalidation of individual files,
        * the entire cache will be flushed.
+       *
        * @param string $filepath
        *   The absolute path of the PHP file to invalidate.
        */
       function drupal_clear_opcode_cache($filepath) {
         if (!defined('PHP_VERSION_ID') || PHP_VERSION_ID < 50300) {
           // Below PHP 5.3, clearstatcache does not accept any function parameters.
           clearstatcache();
+        }
         else {
           clearstatcache(TRUE, $filepath);
+        }
         // Zend OPcache.
         if (function_exists('opcache_invalidate')) {
           opcache_invalidate($filepath, TRUE);
+        }
         // APC.
         if (function_exists('apc_delete_file')) {
           // apc_delete_file() throws a PHP warning in case the specified file was
           // not compiled yet.
           // @see http://php.net/apc-delete-file
           @apc_delete_file($filepath);
+        }
+      }

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