Twig_Error_Syntax : The function "is_granted" does not exist

Question

我正在使用Silex，并且无法在模板中使用is_granted函数。我在文档中找不到任何有关为何无法正常工作的信息。有什么提示吗？

$app->register(new Silex\Provider\SecurityServiceProvider());

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

$app['debug'] = true;

$app['security.firewalls'] = array(
    'login' => array(
                'pattern' => '^/login$',
        ),
        'secured' => array(
                'pattern' => '^.*$',
                'form' => array('login_path' => '/login', 'check_path' => '/login_check'),
                'users' => array(
                        'admin' => array('ROLE_ADMIN', '5FZ2Z8QIkA7UTZ4BYkoC+GsReLf569mSKDsfods6LYQ8t+a8EW9oaircfMpmaLbPBh4FOBiiFyLfuZmTSUwzZg=='),
                ),
        ),
);

$app->get('/', function() use ($app) {
    return $app['twig']->render('index.html.twig');
});

$app->get('/login', function(Request $request) use ($app) {
    return $app['twig']->render('login.html.twig', array(
            'error'                 => $app['security.last_error']($request),
            //'last_username' => $app['session']->get('_security.last_username'),
    ));
});

Answer 1

显然，我还需要添加symfony/bridge组件:

将此添加到composer.json并更新。

"symfony/twig-bridge": "2.1.*",

嘿...它会像预期的那样工作。