drupal中获取url别号

function drupal_get_path_alias($path = NULL, $path_language = NULL) {
 // If no path is specified, use the current page's path.
 if ($path == NULL) {
 $path = $_GET ['q'];
 }
 $result = $path;
 if ($alias = drupal_lookup_path ( 'alias', $path, $path_language )) {
 $result = $alias;
 }
 return $result;
}