Is Session Domain-independent?

[Anon]

Say, if first.com assign me a session using session_start(), then I go to second.com and it assign me a session as well. If then I go back to first.com, would that be a problem? Will first.com see the SID from second.com and consider it an error? Or each domain will realize their own SID?

Thanks!

[Anon]

Totally independant. Sessions are stored on the server. Unless both domains are on the same server, you should never even come close to this situation. Even then sessions are stored with a unique id.