Club Drupal

/**

 * Special characters, defined in RFC_2822.

 */

define('MAIL_RFC_2822_SPECIALS', '()<>[]:;@\,."');

    if (variable_get('mail_display_name_site_name', FALSE)) {

      $display_name = variable_get('site_name', 'Drupal');

      $headers['From'] = drupal_mail_format_display_name($display_name) . ' <' . $default_from . '>';

    }

  if ($from && $from != $default_from) {

/**

 * Return a RFC-2822 compliant "display-name" component.

 *

 * The "display-name" component is used in mail header "Originator" fields

 * (From, Sender, Reply-to) to give a human-friendly description of the

 * address, i.e. From: My Display Name <xyz@example.org>. RFC-822 and

 * RFC-2822 define its syntax and rules. This method gets as input a string

 * to be used as "display-name" and formats it to be RFC compliant.

 *

 * @param string $string

 *   A string to be used as "display-name".

 *

 * @return string

 *   A RFC compliant version of the string, ready to be used as

 *   "display-name" in mail originator header fields.

 */

function drupal_mail_format_display_name($string) {

  // Make sure we don't process html-encoded characters. They may create

  // unneeded trouble if left encoded, besides they will be correctly

  // processed if decoded.

  $string = decode_entities($string);

  // If string contains non-ASCII characters it must be (short) encoded

  // according to RFC-2047. The output of a "B" (Base64) encoded-word is

  // always safe to be used as display-name.

  $safe_display_name = mime_header_encode($string, TRUE);

  // Encoded-words are always safe to be used as display-name because don't

  // contain any RFC 2822 "specials" characters. However

  // mimeHeaderEncode() encodes a string only if it contains any

  // non-ASCII characters, and leaves its value untouched (un-encoded) if

  // ASCII only. For this reason in order to produce a valid display-name we

  // still need to make sure there are no "specials" characters left.

  if (preg_match('/[' . preg_quote(MAIL_RFC_2822_SPECIALS) . ']/', $safe_display_name)) {

    // If string is already quoted, it may or may not be escaped properly, so

    // don't trust it and reset.

    if (preg_match('/^"(.+)"$/', $safe_display_name, $matches)) {

      $safe_display_name = str_replace(array('\\\\', '\\"'), array('\\', '"'), $matches[1]);

    }

    // Transform the string in a RFC-2822 "quoted-string" by wrapping it in

    // double-quotes. Also make sure '"' and '\' occurrences are escaped.

    $safe_display_name = '"' . str_replace(array('\\', '"'), array('\\\\', '\\"'), $safe_display_name) . '"';

  }

  return $safe_display_name;

}

 * Callback for array_walk() within drupal_wrap_mail().