method to process multibranched array by user function

[madrazel]

This is what I've written:

class TEST {
    function awalk($func,$arr) {
        $args = func_get_args(); array_shift($args); array_shift($args);
        foreach ($arr as &$val) {
            if (!is_array($val)) {
                $val = call_user_func_array($func,array_merge((array)$val,$args));
            }
            else {
                $val = call_user_func_array(__METHOD__,array_merge((array)$func,array($val),$args));
            }
        }
        return($arr);
    }
}
$test = new TEST();

function reverse_upper_add($input,$addtext,$prependtext) {
return $prependtext.strtoupper(strrev($input)).$addtext;
}

$testarr = array('london',array('ny',array('la',array('tokyo',array('paris'),'rome'),'moscow'),'dublin',array('berlin',array('warsaw'))),'madrid','lapaz');
print_r($test->awalk('reverse_upper_add',$testarr,'-yepp','wow-'));

Array
(
    [0] => wow-NODNOL-yepp
    [1] => Array
        (
            [0] => wow-YN-yepp
            [1] => Array
                (
                    [0] => wow-AL-yepp
                    [1] => Array
                        (
                            [0] => wow-OYKOT-yepp
                            [1] => Array
                                (
                                    [0] => wow-SIRAP-yepp
                                )

                        [2] => wow-EMOR-yepp
                    )

                [2] => wow-WOCSOM-yepp
            )

        [2] => wow-NILBUD-yepp
        [3] => Array
            (
                [0] => wow-NILREB-yepp
                [1] => Array
                    (
                        [0] => wow-WASRAW-yepp
                    )

            )

    )

[2] => wow-DIRDAM-yepp
[3] => wow-ZAPAL-yepp

And I ask you to tell me is this all ok, maybe I forgot about some tricks to make it faster or simpler.