Symfony2, How to register an extension by using the `addExtension()` method on your main `Environment` object

Question

I would like to load a new extension in a symfony2 project for twig but I don't know where should I put line below to work :

$twig = new Twig_Environment($loader, $config);
$twig->addExtension(new Twig_Extension_Debug());

Any tutorials for http://twig.sensiolabs.org/doc/functions/dump.html ?

Answer 1

I could add debug for twig like below :

# app/config/config.yml
services:
    acme_hello.twig.extension.debug:
        class:        Twig_Extension_Debug
        tags:
             - { name: 'twig.extension' }

Look here for more details;

Answer 2

You have to create a service with twig.extension tag. See here