twig in silex

composer.json

{
    "require": {
        "silex/silex": "1.0.*@dev",
        "twig/twig": ">=1.8,<2.0-dev",
        "symfony/twig-bridge": "~2.1",
        "monolog/monolog": ">=1.0.0"
    }
}

index.php

<?php

// web/index.php

require_once __DIR__.'/../vendor/autoload.php';

$app = new Silex\Application();

$app['debug'] = true;

// define controllers for a blog
// $admin = $app['controllers_factory'];

$app->register(new Silex\Provider\TwigServiceProvider(), array(
    'twig.path' => __DIR__.'/templates',
));

$app->get( '/', function () {
    return $app['twig']->render('Hello {{ name }}!', array('name' => 'Fabien'));
  });

// $app->mount( '/admin', $admin );

$app->run();

$app->get( '/', function () use ($app) {
$app['twig']->render('index.twig', array('name' => 'Fabien'));
});

//index.twig

Hello {{ name }}