function mbStrSplit ($string, $len=1) {
        $start = 0;
        $strlen = mb_strlen($string);
        while ($strlen) {
            $array[] = mb_substr($string,$start,$len,"utf8");
            $string = mb_substr($string, $len, $strlen,"utf8");
            $strlen = mb_strlen($string);
        }
        return $array;
    }