Compare sessions with differnt id

[assessino]

Is it possible to compare mutliple sessions with different id server sided ?
Let's say I want a user logged out (destroy session) on one pc if he logs from another pc.

So I would search on $_SESSION["username"] if i get any doubles. But as far as I know this isn't possible right?

(I'm trying to minimalize the amount of db queries as much as possible)

[thorpe]

the only way you could do this is if you where using custom built session handling. otherwise, each session is only available to each individual.

ps: if you want to look into building your own session handling, have a look at the [man]session_set_save_handler/man function. should be some examples in there.

[assessino]

thought so, guess i'll have to go for a simple table with userID and SessionID to check the UserID and SessionID from my $_SESSION is really the last one that logged in, if not -> kill the session

[thorpe]

did you look at the [man]session_set_save_handler/man function? it makes it real easy to build your own wrapper for php's sessions.

by default, php saves session data in text files on the server. buy using session_set_save_handler() you can save session data to a db instead. making it much easier to keep track of users.

of course, you could just set a clookie when a user logs in, then if they try to login again and already have the cookie set, fail there 2nd login.

[assessino]

it's not a matter of logging in for 2nd time, just for logging in on another pc (and logging out on the first pc at the same time).
But i think i'll stick to my tiny table 🙂

But tnx for the ideas.