PHP 递归删除目录中文件

/**
 * 递归删除目录中文件
 * @param $pathname
 * @return bool
 */
public static function delDir($pathname)//要删除的目录
{
    if(file_exists($pathname)) {
        if(is_file($pathname)) {
            unlink($pathname);
        } else {
            $dir = opendir($pathname);
            while($filename = readdir($dir)) {
                if($filename != "." && $filename != "..") {
                    $filename = $pathname . "/" . $filename;
                    if(is_dir($filename)) {
                        self::delDir($filename);
                    } else {
                        unlink($filename);
                    }
                }
            }
            closedir($dir);
            rmdir($pathname);
        }
    }
    return true;
}