pathinfo()不支持中文的问题

/**
 * 解决path_info 中文问题
 * @param $filepath
 * @return array
 */
public function my_path_info($filepath)
{
    $path_parts = array();
    $path_parts ['dirname'] = rtrim(substr($filepath, 0, strrpos($filepath, '/')),"/")."/";
    $path_parts ['basename'] = ltrim(substr($filepath, strrpos($filepath, '/')),"/");
    $path_parts ['extension'] = substr(strrchr($filepath, '.'), 1);
    $path_parts ['filename'] = ltrim(substr($path_parts ['basename'], 0, strrpos($path_parts ['basename'], '.')),"/");
    return $path_parts;
}