php session variable to disallow one username to log on to the stie from more than on

octpriya

php session variable to disallow one username to log on to the stie from more than one machines.
I have a site on the net www.crnindia.com. There we have password protected pages and the user enters his login details to enter the site. The php pages are checking for the presence of the user in the database and allowing entry to the page, but the php page is not checking whether that user is already checked in or not. The htm pages retieved from the php pages are automatically refreshed after every 10 minutes.
Please help

sarahk

You would need to use a databas as one session is not aware of another. When a session was started it would need to check
that the user is valid (you already do that)
that the user name is not in the "currently logged in" list which is probably what they do at this forum.

Any timestamps older than X minutes would have to be deleted which means that the session would have to be ended automatically after the same idle time or a user could get a second session.

What if a user closes the browser and then decides to return, you will have to make sure you don't lock them out.

octpriya

Thanks for your reply . Yes we will have to check the user already loggin in and remaining there. The htm page retrieved is refreshing every 10 minutes and so i presume the session is laso refreshed every 10 minutes.
Now how to check the userr logged on and to jam his name and when the user leaves how to release his name
Please reply