回复:关于PHP聊天室的讨论_PHP
一、Apache+PHP 能否实现Server Push 将服务器端的聊天信息连续地
源源不断地传送到客户端，类似湛江聊天室。
这种聊天室的WEB服务器一般是自己写的专用聊天服务器。所以才能做到你说的那样。
二、ASP聊天室可通过Application 和 Session 保存信息。Php聊天室
用什么保存公共信息？数据库？文本文件？内存？
PHP4支持SESSION，是用文本文件来实现的。PHPCHINA。COM也有一篇用内存实现APPLICATION的例子。
三、如何判断聊天室视同者Ａ是否在线？
在做定时刷新的时候，就可以在SERVER端置一个时间标志此人在线，如果3分钟都没有更新此标志，就认为此人不在线。
……
四、那里有比较好的ＰＨＰ聊天室源码下栽？
这个嘛，到这里看看吧。http://www.phpwizard.net/index.html
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