Cross site user DB system?

[virtuexru]

OK, so I have two domains. I want to 'inter-link' the users somehow. I'm using MySQL/PHP.

 

Basically this is how it should work:

 

1. User logins in on Domain1.com

2. User moves to Domain2.com and is still logged in

 

My 'check to see if user logged in' script is working through Cookies/Session. Is this possible or am I a complete moron? What are some options.

[BlueSkyIS]

set a cookie at domain one, check for it at domain 2

or

if both sites on the same server, start a session at domain 1, pass session_id to domain 2, pick up session from where it left off on domain 2

[virtuexru]

How would I check the cookie for that specific domain? What's the PHP func?

[rarebit]

Arn't cookies domain specific? So unless the address's are the same you can't use the single cookie method. So you either need to put PHPSESSID in each url (not recommended), or as a page is called it set's / check's the cookie for it's site, and also tells the page to include a section from the other site, which also set's / checks a cookie. This is a bit like when you go to a site and you get adverts and cookies from other sites, and are tracked.

[virtuexru]

So should I just query everytime a user goes into a login specific page? Like for instance I can remote-connect to the DB and check on the fly if a user is logged in or not?

[virtuexru]

Any1?