public static UrlHelper::isExternal($path)
Determines whether a path is external to Drupal.
An example of an external path is http://example.com. If a path cannot be assessed by Drupal's menu handler, then we must treat it as potentially insecure.
Parameters
string $path: The internal path or external URL being linked to, such as "node/34" or "http://example.com/foo".
Return value
bool TRUE or FALSE, where TRUE indicates an external path.
File
- core/lib/Drupal/Component/Utility/UrlHelper.php, line 211
Class
- UrlHelper
- Helper class URL based methods.
Namespace
Drupal\Component\Utility
Code
public static function isExternal($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)
// Leading control characters may be ignored or mishandled by browsers,
// so assume such a path may lead to an external location. The \p{C}
// character class matches all UTF-8 control, unassigned, and private
// characters.
|| (preg_match('/^\p{C}/u', $path) !== 0)
// Avoid calling static::stripDangerousProtocols() if there is any slash
// (/), hash (#) or question_mark (?) before the colon (:) occurrence -
// if any - as this would clearly mean it is not a URL.
|| ($colonpos !== FALSE
&& !preg_match('![/?#]!', substr($path, 0, $colonpos))
&& static::stripDangerousProtocols($path) == $path);
}
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