https://share.weiyun.com/2b3abe0e3f185c440cf455647455f661   TLS后台API
http://bbs.qcloud.com/thread-22519-1-1.html  tls 后台 api 生成 usersig php 平台另一种实现

https://github.com/rongcloud/server-sdk-php

https://github.com/easemob/emchat-server-examples  下载代码
http://blog.csdn.net/wolfking0608/article/details/68928451    环信错误代码解释