php - extract values from multidemensional array

Solution:

It because that thearray_diff is only use for 1 dimension array. For your 2 array, let use some code from php.net

function multidimensional_array_diff($a1, $a2)
{
$r = array();

foreach ($a2 as $key => $second) {
    foreach ($a1 as $key => $first) {

        if (isset($a2[$key])) {
            foreach ($first as $first_value) {
                foreach ($second as $second_value) {
                    if ($first_value == $second_value) {
                        $true = true;
                        break;
                    }
                }
                if (!isset($true)) {

                    $r[$key][] = $first_value;
                }
                unset($true);
            }
        } else {
            $r[$key] = $first;
        }
    }
}
return $r;
}
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