要做一款APP聊天软件，用什么协议好？XMPP还是MQTT？
服务器端最好有PHP的开源方法。
回复内容：
服务器端最好有PHP的开源方法。
就我个人而言，觉得XMPP更合适，这个协议发展很多年了，也是RFC里规定的IM协议，基于XMPP的方案也很多了，服务器方面也有一堆可以选的，而且对于群聊、会话管理、音视频传输都有完整的协议。协议越完整、越开放，这方面的资料也就越多。而且XMPP/JABBER的server有很多可选的，jabberd是c写的，ejabberd是erlang的，最近据说还支持Elixir了，见这里https://blog.process-one.net/ejabberd-joins-the-elixir-revolution/，也有基于java的方案，所以这个的选择看你们团队的技术组成可以有很多选项。
PHP的解决方案也很多，这个我就不列举了。
自己去实现聊天功能，完全是重复造轮子，而且很多坑。
我们公司是用环信提供的IM SDK（不是软文），效果还可以。
另外，淘宝基于旺信，也推了一个SDK，我没试过，你可以看下阿里百川IM
那必须是XMPP啊，之可惜在中国，你懂得，聊天软件你没市场
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