prepare("SELECT * FROM users WHERE username = ?"); $stmt->execute([$username]); $user = $stmt->fetch(); if ($user && password_verify($password, $user['password'])) { $_SESSION['user_id'] = $user['id']; $_SESSION['username'] = $user['username']; $_SESSION['user_role'] = $user['role']; logEvent('auth', "User logged in: $username"); header('Location: index.php'); exit; } else { logEvent('auth', "FAILED login attempt for username: $username"); $error = "Invalid username or password."; } } ?>