比较两个对象数组

I want two know if two array of array of objects are identicals.

Here is how I did :

$differents1 = array_udiff(
    $array1,
    $array2,
    function ($cr1, $cr2) {
        return $cr1->getId() - $cr2->getId();
    }
);
$differents2 = array_udiff(
    $array2,
    $array1,
    function ($cr1, $cr2) {
        return $cr1->getId() - $cr2->getId();
    }
);
$isDifferent = empty($differents1) && empty($differents2);

It works but I wonder if there is a better way.