刚接手的新任务，头有点大！
目前有4个站点，A用的Discuz，B用的wordpress，C和D是独立开发的项目，
4个站点都有一定量的用户，现在需要整合单点登录，这四个站点都是陆陆续续才接入进来，所以目前整合起来感觉有点难度。
在不借助Discuz的Ucenter的情况下，有什么方案可以参考吗？
假如某一个用户在B站和C站分别注册了用户，都是同样的email帐号，此时想登录D站，怎么办？
回复内容：
刚接手的新任务，头有点大！
目前有4个站点，A用的Discuz，B用的wordpress，C和D是独立开发的项目，
4个站点都有一定量的用户，现在需要整合单点登录，这四个站点都是陆陆续续才接入进来，所以目前整合起来感觉有点难度。
在不借助Discuz的Ucenter的情况下，有什么方案可以参考吗？
假如某一个用户在B站和C站分别注册了用户，都是同样的email帐号，此时想登录D站，怎么办？
Ucenter是最好的解决方案，没有之一。
当然如果都是在同一个域名下，用父域名共享cookie_id也是可以的。
A网站提供 OAuth2.0
其他网站统一用 A 网站的第三方登陆。
这样的思路不知道是否可行？
首先建立一个新的user表，专门用于你这4个站点的user表，然后查询的时候先查这个表有没有用户，有的话直接登录，如果没有，再去你这4个分站一一查询，查出来后把该用户的信息写入到这个新的user表，当然，也可以用一个脚本后台直接把4个分站的用户表一次性全部导入到这个表内。个人意见，仅供参考：）
要考虑各个系统的用户密码加密方式；
你只有先整合了所有系统的会员数据，才有可能去做单点登录
自己整个会员管理系统吧。所有的站登录都去这个系统去调用api接口。
供参考。。
ucenter不就是个会员管理的系统吗？？？为啥踩-_-...请指点？
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