thoughtful_array_diff.php

<?php
/**
 * Similar to array_diff() but works with the base multidimensional arrays
 *
 * @params array ...
 * @return array
 */
function arrayDiff()
{
    $arys    = func_get_args();
    $prime   = array_shift($arys);
    $results = array();
    foreach ($prime as $key => $value) {
        $found = false;
        foreach ($arys as $ary) {
            if (array_search($value, $ary) !== false) {
                $found = true;
            }
        }

        if (!$found) {
            $results[$key] = $value;
        }
    }

    return $results;
}

function altArrayDiff()
{
    $arys    = func_get_args();
    $prime   = array_shift($arys);
    foreach ($prime as $key => $value) {
        foreach ($arys as $ary) {
            if (array_search($value, $ary) !== false) {
                $prime[$key] = null;
                break;
            }
        }
    }

    return array_filter($prime);
}

function anyArrayDiff()
{
    $results = array();
    foreach (func_get_args() as $ary) {
        foreach ($ary as $key => $value) {
            $rKey = array_search($value, $results);
            if ($rKey === false) {
                if (array_key_exists($key, $results)) {
                    $results[] = $value;
                }
                else {
                    $results[$key] = $value;
                }
            }
            else {
                unset($results[$rKey]);
            }
        }
    }

    return array_filter($results);
}