<?php
session_start();

// This is a simulation. In a real app, you'd validate against a database.
function login($email) {
    $_SESSION['user'] = ['email' => $email];
    header('Location: index.php');
    exit();
}

function logout() {
    session_destroy();
    header('Location: login.php');
    exit();
}

function check_auth() {
    if (!isset($_SESSION['user'])) {
        header('Location: login.php');
        exit();
    }
}


if (isset($_GET['logout'])) {
    logout();
}