How to expire PHP sessions after set a period of time

In PHP  |  Last Updated on Wed, 27 Jan 2016

This post is about “How to expire PHP sessions after set a period of time”. In this post I’ll show you how to expire a user’s session after 6 minutes of inactivity.
 

<?php
    session_start();
    
    if(isset($_SESSION['login_user_mail_address']))
    {
        // set time-out period (in seconds)
        $inactive = 600;
         
        // check to see if $_SESSION["timeout"] is set
        if (isset($_SESSION["timeout"])) {
            // calculate the session's "time to live"
                $sessionTTL = time() - $_SESSION["timeout"];
                if ($sessionTTL > $inactive) {
                    session_destroy();
                    
                    ?>
                        // Page redirection
                        <script>window.location = 'logout.php';</script>
                    <?php
                  
                }
            }
             
            $_SESSION["timeout"] = time();
    
    }
?>