App\Controller\AppController::beforeRender PHP Method

    public function beforeRender(Event $event)
    {
        if (!array_key_exists('_serialize', $this->viewVars) && in_array($this->response->type(), ['application/json', 'application/xml'])) {
            $this->set('_serialize', true);
        }
    }

 /**
  * beforeRender Event
  *
  * @param Event $event Event
  * @return void
  */
 public function beforeRender(Event $event)
 {
     if ($this->_adminAreaIntegration) {
         $this->_setupAdminAreaIntegration();
     }
     parent::beforeRender($event);
 }