symfony entity setmaxresult/limit on array collection

You can use doctrine's Criteria class to filter/sort/limit your records

public function getShoes() {
    $criteria = \Doctrine\Common\Collections\Criteria::create()
        ->orderBy(array('your_property_to_sort_collection'=> \Doctrine\Common\Collections\Criteria::DESC))
        ->setMaxResults(5);
    return $this->shoes->matching($criteria);
}