在不同站点之间传递数据（在不同服务器上）

Question

I have 5 different websites on 5 different servers, I am now attempting to create 1 login system for them all, i use php for the session handling on all of them, but now i need to pass sessions between sites/server securely, please advice me to the best way to achieve this.

Answer 1

This is called Single Sign-On.