Recursive Array Search

recursive.php

    // Recursivly search through an array, if the key is found, then return TRUE
    private function _recursiveArraySearch($haystack, $needle, $index = null)
    {
        $aIt     = new RecursiveArrayIterator($haystack);
        $it    = new RecursiveIteratorIterator($aIt);

        while($it->valid())
        {       
            if (((isset($index) AND ($it->key() == $index)) OR (!isset($index))) AND ($it->current() == $needle)) {
                //return $aIt->key();
                return TRUE;
            }

            $it->next();
        }

        return FALSE;
    }