php__silex__book/src/demo/Controllers/HomeController.php

<?php

namespace demo\Controllers;

use Silex\Application;

/**
 * Class HomeController demonstrates use of Twig
 *
 * @package demo\Controllers
 */
class HomeController {

  public function home(Application $app) {
   return $app['twig']->render('index.html.twig', [
     'nav' => $app['nav_builder']->build(),
   ]);
  }

}