prepare("SELECT * FROM users WHERE email = :email"); $stmt->execute(['email' => $email]); $user = $stmt->fetch(); if ($user && password_verify($password, $user['password'])) { $_SESSION['user_id'] = $user['id']; $_SESSION['username'] = $user['username']; header("Location: dashboard.php"); exit; } else { $error = 'Invalid email or password.'; } } catch (PDOException $e) { $error = "Database error: " . $e->getMessage(); } } } ?>