Set session duration to 2 hours

Admin.php

@@ -1,5 +1,6 @@
 <?php
 include 'NoDirectPhpAcess.php';
+include 'IsValidSession.php';
 ?>
 
 <?php

Course.php

@@ -1,5 +1,6 @@
 <?php
 include 'NoDirectPhpAcess.php';
+include 'IsValidSession.php';
 ?>
 
 <?php

Courses.php

@@ -1,5 +1,6 @@
 <?php
 include 'NoDirectPhpAcess.php';
+include 'IsValidSession.php';
 ?>
 
 <?php

Header.php

@@ -1,5 +1,4 @@
 <?php
-session_start();
 error_reporting(0);
 date_default_timezone_set('Asia/Shanghai');
 

IsValidSession.php

@@ -0,0 +1,10 @@
+<?php
+    $currentTime = time();
+    if (session_status() == PHP_SESSION_NONE) {
+        session_start();
+     }
+
+    if($_SESSION['expire'] != null && $currentTime > $_SESSION['expire']) {
+        include 'logout.php';
+    }
+?> 

Script.php

@@ -75,6 +75,11 @@ if (!empty($_POST["form_signup"])) {
     $_SESSION['user_email'] = $email;
     $_SESSION['user_student_id'] = $student_id;
 
+    // set session duration
+    $_SESSION['start'] = time();
+    $session_duration = 120;
+    $_SESSION['expire'] = $_SESSION['start'] + ($session_duration * 60);
+
     // check confirmed password
     if (strcasecmp($password, $confirmpassword) != 0) {
         $_SESSION['info_signup'] = "Password confirmation failed.";
@@ -162,6 +167,11 @@ if (!empty($_POST["frm_login"])) {
                 $_SESSION['user_type'] = $row['UserType'];
                 $_SESSION['user_fullname'] = $row['Full_Name'];
 
+                // set session duration
+                $_SESSION['start'] = time();
+                $session_duration = 120;
+                $_SESSION['expire'] = $_SESSION['start'] + ($session_duration * 60);
+
                 if ($_SESSION['user_type'] == "Student") {
                     header("Location: Courses.php");
                 }