Automatically log out php application after 2 mins - php

Question

I have finished designing an application but would like to make the application logout out after 5 minutes of inactivity.
The first page is:
<?php
session_start();
require_once("class.user.php");
$login = new USER();
if($login->is_loggedin()!="")
{
$login->redirect('user.php');
}
?>
This is the user page:
<?php
require_once("session.php");
require_once("class.user.php");
$auth_user = new USER();
$user_pin = $_SESSION['user_session']; ?>
The session.php page
<?php
session_start();
require_once 'class.user.php';
$session = new USER();
if(!$session->is_loggedin())
{
$session->redirect('index.php');
}
?>
This are the classes:
require_once('dbconfig.php');
class USER
{
private $conn;
public function __construct()
{
$database = new Database();
$db = $database->dbConnection();
$this->conn = $db;
}
public function runQuery($sql)
{
$stmt = $this->conn->prepare($sql);
return $stmt;
}
public function is_loggedin()
{
if(isset($_SESSION['user_session']) )
{
return true;
}
}
public function redirect($url)
{
header("Location: $url");
}
public function doLogout()
{
session_destroy();
unset($_SESSION['user_session']);
return true;
}
}
?>

Answer 1

Theres multiple ways to achieve this:
You can make a verification with a cookie or a session with a Timestamp to verify if the user has not changed paged within 2 minutes and it will log him out the moment he access that page. The Con in this method is that for all intents and purposes the user is still considered "Online" until he changes page.
My preferred method is to make a pooling with JQuery and Ajax request.
Basically every X seconds you send a request with AJAX to the user to see if hes still there and update his timestamp on the database. And then with a server side script if the timestamp has reach 2 minutes difference set the user offline and force log him out.
There is always websockets, at the moment im exploring this method with rachetphp but it allows you to track a connection in real time, which is also pretty sweet.
Check this link for methods.