Helper\Updater::fileCheck PHP Method

    public static function fileCheck()
    {
        $channel = Option::get('channel') == 'dev' ?: 'stable';
        $current_version = Option::get("version");
        $data = self::doGet(self::UPDATE_SERVER . "file.json?channel={$channel}&ver={$current_version}");
        if (!$data) {
            return -1;
        }
        // 请求更新服务器失败
        $data = json_decode($data, true);
        $file_list = $data['list'];
        if (!$file_list) {
            return -2;
        }
        // 更新服务器文件列表为空
        $err_file = $list = array();
        foreach ($file_list as $file) {
            $path = $file['path'];
            $hash = $file['hash'];
            $file_hash = md5_file(ROOT_PATH . "{$path}");
            if ($file_hash != $hash) {
                $err_file[] = array($path, $hash);
                $list[] = $path;
            }
        }
        if (!$list) {
            return 0;
        }
        // 无文件更新
        Option::set('new_version', 1);
        sort($list);
        sort($err_file);
        Downloader::save('kk_updater', $err_file);
        Downloader::save('need_download', $err_file);
        return $list;
    }