how to control the user relogin

If one user have login in one computer or a browser,then he login in another computer/browser again,so the former login should be marked as开发者_如何转开发 invalid,is there any way to implement this?

One way it to set a cookie with a session id when they log in, and record the latest session id somewhere server-side (like a database) keyed by that user id. On any website access, verify it's the latest session for that user.