function valid_url

Verifies the syntax of the given URL.

This function should only be used on actual URLs. It should not be used for Drupal menu paths, which can contain arbitrary characters. Valid values per RFC 3986.

Parameters

$url: The URL to verify.

$absolute: Whether the URL is absolute (beginning with a scheme such as "http:").

Return value

TRUE if the URL is in a valid format.

Related topics

Input validation
Functions to validate user input.
11 calls to valid_url()
aggregator_form_feed_validate in drupal/modules/aggregator/aggregator.admin.inc
Form validation handler for aggregator_form_feed().
aggregator_form_opml_submit in drupal/modules/aggregator/aggregator.admin.inc
Form submission handler for aggregator_form_opml().
aggregator_form_opml_validate in drupal/modules/aggregator/aggregator.admin.inc
Form validation handler for aggregator_form_opml().
comment_form_validate in drupal/modules/comment/comment.module
Validate comment form submissions.
CommonURLUnitTest::testDrupalParseUrl in drupal/modules/simpletest/tests/common.test
Test drupal_parse_url().

... See full list

File

drupal/includes/common.inc, line 1253
Common functions that many Drupal modules will need to reference.

Code

function valid_url($url, $absolute = FALSE) {
  if ($absolute) {
    return (bool) preg_match("\n      /^                                                      # Start at the beginning of the text\n      (?:ftp|https?|feed):\\/\\/                                # Look for ftp, http, https or feed schemes\n      (?:                                                     # Userinfo (optional) which is typically\n        (?:(?:[\\w\\.\\-\\+!\$&'\\(\\)*\\+,;=]|%[0-9a-f]{2})+:)*      # a username or a username and password\n        (?:[\\w\\.\\-\\+%!\$&'\\(\\)*\\+,;=]|%[0-9a-f]{2})+@          # combination\n      )?\n      (?:\n        (?:[a-z0-9\\-\\.]|%[0-9a-f]{2})+                        # A domain name or a IPv4 address\n        |(?:\\[(?:[0-9a-f]{0,4}:)*(?:[0-9a-f]{0,4})\\])         # or a well formed IPv6 address\n      )\n      (?::[0-9]+)?                                            # Server port number (optional)\n      (?:[\\/|\\?]\n        (?:[\\w#!:\\.\\?\\+=&@\$'~*,;\\/\\(\\)\\[\\]\\-]|%[0-9a-f]{2})   # The path and query (optional)\n      *)?\n    \$/xi", $url);
  }
  else {
    return (bool) preg_match("/^(?:[\\w#!:\\.\\?\\+=&@\$'~*,;\\/\\(\\)\\[\\]\\-]|%[0-9a-f]{2})+\$/i", $url);
  }
}