Doing this in a symfony2 controller results in an array where each single result is itself an object.. but i need it to be an array as well so i can easily json_encode the whole list

$em->getRepository('MyBundle:Report')->findByEvaluation($evaluation_id, \Doctrine\ORM\Query::HYDRATE_ARRAY) 

So how do i get an array of arrays and not an array of objects which is what i'm getting by using HYDRATE_ARRAY?