telnet发送数据到自定义协议的tcp服务

    public static function input($buffer)
    {
        if(strlen($buffer) < self::PACKAGE_HEAD_LEN)//消息头固定65
        {
            return 0;
        }
        //消息头29-32为包长度
        $body_length = intval(substr($buffer, 28, 4));
        $total_length = $body_length + self::PACKAGE_HEAD_LEN;
        return $total_length;
    }