Usernames and passwords are stored in an array in the check-login web page.
Action page of login.php:
login_action.php
<?php // Array of users: username => password $users["admin"] = "adminadmin"; $users["vadim"] = "vadimvadim"; foreach($users as $name => $password) { if($name == $_POST["username"] && $password == $_POST["password"]) { // Username and password are correct header("Location: private.php"); die(); } } // Username and password are incorrect header("Location: login.php") ?>