function url_is_external in Drupal 7

Returns TRUE if a path is external to Drupal (e.g. http://example.com).

If a path cannot be assessed by Drupal's menu handler, then we must treat it as potentially insecure.

Parameters

$path: The internal path or external URL being linked to, such as "node/34" or "http://example.com/foo".

Return value

Boolean TRUE or FALSE, where TRUE indicates an external path.

12 calls to url_is_external()

CommonURLUnitTest::testDrupalParseUrl in modules/simpletest/tests/common.test

Test drupal_parse_url().

drupal_deliver_html_page in includes/common.inc

Packages and sends the result of a page callback to the browser as HTML.

drupal_goto in includes/common.inc

Sends the user to a different page.

drupal_valid_path in includes/path.inc

Checks a path exists and the current user has access to it.

form_builder in includes/form.inc

Builds and processes all elements in the structured form array.

... See full list

1 string reference to 'url_is_external'

field_ui_next_destination in modules/field_ui/field_ui.admin.inc

Returns the next redirect path in a multipage sequence.

File

includes/common.inc, line 2392

Common functions that many Drupal modules will need to reference.

Code

function url_is_external($path) {
  $colonpos = strpos($path, ':');

  // Some browsers treat \ as / so normalize to forward slashes.
  $path = str_replace('\\', '/', $path);

  // If the path starts with 2 slashes then it is always considered an external
  // URL without an explicit protocol part.
  return strpos($path, '//') === 0 || preg_match('/^\\p{C}/u', $path) !== 0 || $colonpos !== FALSE && !preg_match('![/?#]!', substr($path, 0, $colonpos)) && drupal_strip_dangerous_protocols($path) == $path;
}