请教一下，web在线实时聊天程序（1对1聊天），其中消息接收这个功能，应该怎么设计比较好？
基于PHP的web实时聊天程序，1对1在线实时聊天，不能1对多，也不能多对1
发送消息比较简单，因为有客户端的提交操作可以识别
但是接收消息应该怎么设计比较好？
我的想法是：能不能让接收方只在发送方发送消息以后再执行接收操作，在发送方没有发送消息时，接收方则不会请求数据。
另外，一个用户既是发送方，同时也是接收方，主要是取决于用户当前的操作
回复讨论(解决方案)
看你说的好像还是在一般网页提交的思路
连天还是考虑长连接+socket/websocket吧
看你说的好像还是在一般网页提交的思路
连天还是考虑长连接+socket/websocket吧
目前我查到的资料有三种说法（不知道是不是有重复）：
1、长连接
2、轮询
3、websocket
不知道这三种是不是都可以完成我说的目标？
长连接+socket如果没有控件在浏览器实现并不容易
websocket是html5的，并非所有浏览器都支持，只有较新版本的可以尝试
ajax轮询网上有例子，可以搜索一下
长连接+socket如果没有控件在浏览器实现并不容易
websocket是html5的，并非所有浏览器都支持，只有较新版本的可以尝试
ajax轮询网上有例子，可以搜索一下
那这么说的话，应该是用ajax轮询了吧，那这个情况的话，应该是用长轮询了吧
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