secretpage.php

<?php
    session_start(); // if session variable not set, redirect to login page
    if (!isset($_SESSION['authenticated'])) {
        header('Location: http://mike-eng.com/temp/php/sessions/login.php');
        exit;
    }
?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Menu</title>
</head>
<body>
    This is the secret page.
</body>
</html>