array_diff ...

gistfile1.aw

<?php
function array_diff_simple($a, $b)
{
    $r = array();

    foreach($a as $key => $val) {
        if(!isset($b[$key])) {
            $r[$key] = $val;
        } else {
            if(is_array($b[$key]) && !is_array($val)) {
                $r[$key] = $val;
            }
        }
    }

    return $r;
}