Timber\URLHelper::is_local PHP Method

    public static function is_local($url)
    {
        if (strstr($url, self::get_host())) {
            return true;
        }
        return false;
    }

 /**
  * @internal
  * @param string $url
  */
 protected function init_with_url($url)
 {
     $this->abs_url = $url;
     if (URLHelper::is_local($url)) {
         $this->file = URLHelper::remove_double_slashes(ABSPATH . URLHelper::get_rel_url($url));
         $this->file_loc = URLHelper::remove_double_slashes(ABSPATH . URLHelper::get_rel_url($url));
     }
 }