User loin + session timeout very urgent

hi,am new in php
i have php4.
i know how to deal with database in php and  a basic knowledge about sessions.
how can i set a timeout for a session so i can force the user to login again ?
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selim007Asked:
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Richard QuadlingConnect With a Mentor Senior Software DeveloperCommented:
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
                                                     // always modified
header("Cache-Control: no-store, no-cache, must-revalidate");  // HTTP/1.1
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");                          // HTTP/1.0

This is from the PHP manual.

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Richard QuadlingSenior Software DeveloperCommented:
Several things.

1 - Add the datetime to the session vars and check this BEFORE processing any other session vars when you get to a new page. If the difference between the current datetime and the session datetime is greater than some limit you decide upon, then they did nothing within the timeframe specified.

If the difference is LESS than the limit, then update the datetime in the session vars.

This means if the limit is 5 minutes and I update a page every 3 minutes, the last page still has a 5 minute limit.

2 - In the <HEAD></HEAD> of the page you can ...

<meta name="refresh" content="300;url=http://www.some.com/autologout.php">
<meta name="Cache-Control" name="no-cache,no-store">

or you can put them in using header();

Regards,

Richard.
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Richard QuadlingSenior Software DeveloperCommented:
Any luck?
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