Doctrine Fetch Any Number of Random Results

1. composer.json

 {
    ...
     "require": {
        "luxifer/doctrine-functions": "~1.4",
   }
}

2. config.yml

doctrine:
    ...
    orm:
        ...
        dql:
            ...
            numeric_functions:
                RAND: Luxifer\DQL\Numeric\Rand

3. MyRepository.php

<?php
namespace AppBundle\Repository;

use Doctrine\ORM\EntityRepository;

class MyRepository extends EntityRepository
{
    public function findRandom($numResults)
    {
        $qb = $this->createQueryBuilder('i');
        $qb->select('i, RAND() AS HIDDEN r')
            ->setParameter("b", true)
            ->orderBy('r', 'ASC')
            ->setMaxResults($numResults);
        $query = $qb->getQuery();

        return $query->getResult();
    }
}

4. MyController.php

<?php
namespace GrayLoon\AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class MyController extends Controller
{
    public function indexAction(Request $request)
    {
        $em = $this->getDoctrine()->getManager();
        $work = $em->getRepository('AppBundle:My')->findRandom(4);

        return $this->render(
            '::index.html.twig',
            array(
                'entities'    => $entities,
            )
        );
    }
}