PHP不活动超时和session_status（）

Question

I'm trying to do some protective stuff to prevent pages from accessing databases when a php page has been idle and the session has expired because of inactivity. I'm basing some of it on session_status() and am having issues with that.

Using alerts and console.log, I find the php and js code seems to be ok. When I artificially inject session_status() values, I get the results I expect.

The problem seems to be that session_start() always returns 2 (available) even after the session has timed out.

Should I not expect system_status to be updated automatically after inactivity timeouts? Is there a better way than session_status() to check for session status?

Here is the 'onclick' function that returns '2' for system_status() on an expired page when the button is clicked:

$("#save-to-database").click(function () {

    var active = <?php echo session_status(); ?>;

    if(active == 2) {  //the session is active, do the sort & save

       saveStuff();

    } else {  // the login has expired, abandon this and reload index.php

        window.location.replace("index.php?artist=" + <?php echo $artist ?>);

    }
});

Answer 1

This a long way to go about this but this works fine.

function isSessionActive() {
    session_start();
    $lastActivity=$_SESSION['lastActivity'];
    if ($lastActivity!=null && ($lastActivity+(10*60) > time())) {
        $_SESSION['lastActivity']=time();
        return true;    
    } else {
        deleteSession();
        return false;
    }
}

function deleteSession() {
    session_start();
    setcookie("PHPSESSID", "", time() - 3600, '/');
    session_unset();
    session_destroy();
}