app/bundles/CoreBundle/Twig/Extension/ClassExtension.php

<?php

declare(strict_types=1);

namespace Mautic\CoreBundle\Twig\Extension;

use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;
use Twig\TwigTest;

/**
 * Helper for getting a class reference from a Twig template.
 */
class ClassExtension extends AbstractExtension
{
    /**
     * @return TwigFunction[]
     */
    public function getFunctions(): array
    {
        return [
            new TwigFunction('get_class', fn ($value) => (new \ReflectionClass($value))->getShortName()),
        ];
    }

    /**
     * @return TwigTest[]
     */
    public function getTests(): array
    {
        return [
            new TwigTest('instanceof', fn ($value, $class) => $value instanceof $class),
        ];
    }
}