Question

I can use Server[request_time] to get current timestamp. But how would I use this on each request so that I know which session hasn’t been active for more than 10 minutes? Basically I do not know how to detect these requests so that I can capture the last timestamp(based on that request). Does it have to be attached to every single html button?

Answer 1

You can save the time of the last request in the session:

$_SESSION['last_request'] = time();

You do this on every request.

Before you update the session value, you can check how long the session was inactive:

if (time() - $_SESSION['last_request'] > 10*60) {
    echo 'You were inactive for at least 10 minutes.';
}

PS: You can use $_SERVER['REQUEST_TIME'] instead of time() if you have very long running scrips. In most scenarios it will make no difference.