Il faut d’abord commencer par créer la classe dans Acme\Bundle\AcmeBundle\Twig\Extension

<?php
namespace Acme\Bundle\AcmeBundle\Twig\Extension;
use Symfony\Component\HttpFoundation\Request;
class AcmePageExtension extends \Twig_Extension
{
 protected $request;
 /**
 *
 * @var \Twig_Environment
 */
 protected $environment;
public function __construct(Request $request)
 {
 $this->request = $request;
 }
public function initRuntime(\Twig_Environment $environment)
 {
 $this->environment = $environment;
 }
public function getFunctions()
 {
 return array(
 'getControllerName' => new \Twig_Function_Method($this, 'getControllerName'),
 'getActionName' => new \Twig_Function_Method($this, 'getActionName'),
 );
 }
/**
 * Get controller name
 */
 public function getControllerName()
 {
 $regexp = "#Controller\\\([a-zA-Z]*)Controller#";
 $results = array();
 preg_match($regexp, $this->request->get('_controller'), $results);
return strtolower($results[1]);
 }
/**
 * Get action name
 */
 public function getActionName()
 {
 $regexp = "#::([a-zA-Z]*)Action#";
 $results = array();
 preg_match($regexp, $this->request->get('_controller'), $results);
return $results[1];
 }
public function getName()
 {
 return 'acme_page';
 }
}

Ensuite, il faut créer le service dans services.xml

<parameters>
  <parameter key="acme.enhance.twig.class">Acme\Bundle\AcmeBundle\Twig\Extension\AcmePageExtension</parameter>
</parameters>

<services>
<service id="request" class="Symfony\Component\HttpFoundation\Request" />
<service id="acme.enhance.twig" class="%acme.enhance.twig.class%">
 <tag name="twig.extension" />
 <argument type="service" id="request" />
 </service>
</services>

Pour connaitre le nom du controller ou de l’action, il suffit de faire :

{{ getControllerName() }}
ou
{{ getActionName() }}