How to add a twig extension

Creating an extension for twig is very useful and important: access a specific variable anywhere, increase app efficiency by setting up autonomous block etc.

Here are my sources:

Declare your service into service.yml (curious, isn’t it ? :). Don’t forget to enable it in DependencyInjection\YourBundleExtension by uncommenting $loader->load(‘services.yml’) and then:

services:
breaz.twig.my_name:
class: Breaz\CoreBundle\Twig\NameitExtension
arguments: [@doctrine,@security.context]
tags:
- { name: twig.extension }

 

Then the file:

namespace Acme\XXXBundle\Twig;
use Doctrine\Bundle\DoctrineBundle\Registry;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Security\Core\SecurityContext;

class NameitExtension extends \Twig_Extension {
private $em;
private $user;

public function __construct(Registry $doctrine, $context) {
if (!is_object($context->getToken())) {
return;
}

$this->user = $context->getToken()->getUser();
$this->em = $doctrine->getManager();

}

public function getFunctions()
{
return array(
// Add any function you need and declare them in your object
‘nb_favorite’ => new \Twig_Function_Method($this, ‘nbFavorite’)
);
}

public function nbFavorite()
{
// Put your code here
}

public function getName()
{
return ‘NameitExtension’;
}
}

This file allow you to call {{ nb_favorite() }} in any twig template. It will return the value you defined above.