Add support for instanceof in Twig

InstanceofExtension.php

<?php

namespace Xthiago\CoreBundle\Twig;

class InstanceofExtension extends \Twig_Extension
{
    /**
     * {@inheritdoc}
     */
    public function getTests()
    {
        return array(
            new \Twig_SimpleTest('instanceof', array($this, 'isInstanceOf'))
        );
    }

    public function isInstanceOf($object, $class)
    {
        if (!is_object($object))
            return false;

        $reflectionClass = new \ReflectionClass($class);

        return $reflectionClass->isInstance($object);
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'xthiago_instanceof_extension';
    }
}