public function redirect($controller, $action = '')
 {
     if (UtilFunctions::startsWith($controller, "http") || UtilFunctions::startsWith($controller, "www")) {
         header('Location: ' . $controller);
     } else {
         header('Location: ' . HOSTNAME . $controller . ($action != "" ? "/" . $action : ""));
     }
     die;
 }