arrayDiffAllKey.php

<?php 
$arrayDiff = function($arr1, $arr2) use (&$arrayDiff) {
    foreach ($arr1 as $k => $a1) {
        if ( ! isset($arr2[$k])) {
            continue;
        }
        if (is_array($arr1[$k])) {
            return $arrayDiff($arr1[$k], $arr2[$k]);
        } else {
            if ((string)$arr1[$k] != (string)$arr2[$k]) {
                return array(
                    'old' => array($k => $arr1[$k]),
                    'new' => array($k => $arr2[$k]),
                );
            }
        }
    }
};

$arr1 = array(
    'd'=>23,
    '33' => array(
        '55'=>1
    ),
);

$arr2 = array(
    'd'=>23,
    '33' => array(
        '55'=>2
    ),
);

var_dump($arrayDiff($arr1, $arr2));