PHP: fsockopen

http://php.net/manual/zh/function.fsockopen.php

php中curl、fsockopen的应用

http://www.cnblogs.com/lmule/archive/2010/10/27/1862725.html

深入浅出讲解：php的socket通信

http://www.cnblogs.com/thinksasa/archive/2013/02/26/2934206.html

Workerman是一款纯PHP开发的开源高性能的PHP socket 服务器框架。

http://www.workerman.net/

Swoole：PHP语言的高性能网络通信框架

http://www.swoole.com/

PHP做端口监听示例代码

http://www.jbxue.com/article/16318.html

php的三种CLI常量：STDIN,STDOUT,STDERR

http://www.cnblogs.com/thinksasa/archive/2013/02/27/2935158.html