Register Session auto

[guest]

ok i am looking for a script that will start a session on my site automatically when theres the "?id=" in the url automatically.

and another script that will list all the sessions of the id's on the page and once they leave the site could i have it be deleted from the list

Q: If im creating sessions on my site do i have to have that session code on the top of every page?

[gavwvin]

You need session_start() at the head of every page to use session data on that page.
To start a seesion if theres an id in the query string, I suppose you'd use:

if($_GET['id']) session_start();