Simple PHP function to emulate the jQuery extend feature.

array_extend.php

function array_extend() {
    $arrays = func_get_args();
    $base = array_shift($arrays);
    foreach ($arrays as $array) {
        reset($base);
        while (list($key, $value) = @each($array))
            if (is_array($value) && @is_array($base[$key]))
                $base[$key] = array_extend($base[$key], $value);
            else $base[$key] = $value;
    }
    return $base;
}