<?php
session_start();

if (!isset($_SESSION['loggedin'])) {
    header('Location: login.php');
    exit();
}
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>SecretPage / myPHP.se</title>
</head>
<body>
    <H2>Secret page</H2>
    <p>Welcome, admin! You are logged in.</p>
    <p><a href="logout.php">Log out</a></p>
</body>
</html>