session timeout due to inactivity [duplicate]

Answer 1

Implement this idea:

$expire_time = 3*60*60; //expire time
if( $_SESSION['last_activity'] < time()-$expire_time ) {
    echo 'session expired';
    die();
}
else {
    $_SESSION['last_activity'] = time(); // you have to add this line when logged in also;
    echo 'you are uptodate';
}