prepare("INSERT INTO users (username, email, password) VALUES (:username, :email, :password)"); $stmt->execute([ ':username' => $username, ':email' => $email, ':password' => $hashedPassword ]); header("Location: ../index.php"); }catch (PDOException $e){ if($e->getCode() == 23000){ header("Location: ../userused.html"); }else { echo "Fehler: " . $e->getMessage(); } } } ?>