yii\web\Request::resolve PHP Method

    public function resolve()
    {
        $result = Yii::$app->getUrlManager()->parseRequest($this);
        if ($result !== false) {
            list($route, $params) = $result;
            if ($this->_queryParams === null) {
                $_GET = $params + $_GET;
                // preserve numeric keys
            } else {
                $this->_queryParams = $params + $this->_queryParams;
            }
            return [$route, $this->getQueryParams()];
        } else {
            throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'));
        }
    }

 /**
  * Handles the specified request.
  * @param Request $request the request to be handled
  * @return Response the resulting response
  * @throws NotFoundHttpException if the requested route is invalid
  */
 public function handleRequest($request)
 {
     if (empty($this->catchAll)) {
         list($route, $params) = $request->resolve();
     } else {
         $route = $this->catchAll[0];
         $params = $this->catchAll;
         unset($params[0]);
     }
     try {
         Yii::trace("Route requested: '{$route}'", __METHOD__);
         $this->requestedRoute = $route;
         $result = $this->runAction($route, $params);
         if ($result instanceof Response) {
             return $result;
         } else {
             $response = $this->getResponse();
             if ($result !== null) {
                 $response->data = $result;
             }
             return $response;
         }
     } catch (InvalidRouteException $e) {
         throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'), $e->getCode(), $e);
     }
 }