ajax-answer for ajax-request in phalcon base controller

gistfile1.php

public function afterExecuteRoute($dispatcher) {
	$is_ajax = isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
	if ($is_ajax) {
		$this->view->disableLevel(\Phalcon\Mvc\View::LEVEL_MAIN_LAYOUT);

		$eventsManager = new \Phalcon\Events\Manager();

		$eventsManager->attach('view:afterRender', function ($event, $view) {
			$view->setContent(json_encode(array(
				'content' => $view->getContent(),
				'title' => \Phalcon\Tag::getTitle(false)
			)));
		});

		$this->view->setEventsManager($eventsManager);
		$this->response->setHeader('Content-Type', 'text/plain');
	}
}