function valid_url in Drupal 4

Same name and namespace in other branches

1. 5 includes/common.inc \valid_url()
2. 6 includes/common.inc \valid_url()
3. 7 includes/common.inc \valid_url()

Verify the syntax of the given URL.

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

4 calls to valid_url()

comment_validate in modules/comment.module

path_form_validate in modules/path.module

Verify that URL alias is valid.

path_nodeapi in modules/path.module

Implementation of hook_nodeapi().

profile_validate_profile in modules/profile.module

File

includes/common.inc, line 670

Common functions that many Drupal modules will need to reference.

Code

function valid_url($url, $absolute = FALSE) {
  $allowed_characters = '[a-z0-9\\/:_\\-_\\.\\?\\$,;~=#&%\\+]';
  if ($absolute) {
    return preg_match("/^(http|https|ftp):\\/\\/" . $allowed_characters . "+\$/i", $url);
  }
  else {
    return preg_match("/^" . $allowed_characters . "+\$/i", $url);
  }
}