title: How do I expire a PHP session after sometime when user is not active
body: <p>i want php session to be expired if there is no activity on the page for more than 10 to 20 minutes. Or user is not available for more than 20 min.Say we are taking an example of login, user logged in and after 20 min if there is no activity , it should expire the session and redirect to login page again. </p>