mb_basedir() multibyte function

<?php
/**
 * Author: Peter Dragicevic [peter-91@hotmail.de]
 * Authors-Website: http://petschko.org/
 * Licence: http://creativecommons.org/licenses/by-sa/4.0/
 * Date: 28.07.2015
 * Time: 10:34
 */

if(!function_exists("mb_basename")) {
    /**
     * @param string $path - Path to convert
     * @param null $suffix - Remove this ending if exists
     * @return string - Filename without path (and may without suffix)
     */
    function mb_basename($path, $suffix = null) {
        if(mb_stripos($path, DIRECTORY_SEPARATOR) !== false)
            $basename = mb_substr($path, mb_strripos($path, DIRECTORY_SEPARATOR));
        else
            $basename = $path;

        if($suffix && mb_stripos($basename, $suffix)) {
            $suffix_pos = mb_strlen($suffix) * -1;
            $base_end = mb_substr($basename, $suffix_pos);

            if($base_end == $suffix)
                $basename = mb_substr($basename, 0, $suffix_pos);
        }

        return $basename;
    }
}

?>