Car Rental Php Script Instant

<form method="POST" action=""> <div class="mb-3"> <label>Username</label> <input type="text" name="username" class="form-control" required> </div> <div class="mb-3"> <label>Email</label> <input type="email" name="email" class="form-control" required> </div> <div class="mb-3"> <label>Full Name</label> <input type="text" name="full_name" class="form-control" required> </div> <div class="mb-3"> <label>Phone</label> <input type="text" name="phone" class="form-control" required> </div> <div class="mb-3"> <label>License Number</label> <input type="text" name="license_number" class="form-control" required> </div> <div class="mb-3"> <label>Password</label> <input type="password" name="password" class="form-control" required> </div> <button type="submit" class="btn btn-primary w-100">Register</button> </form> <div class="mt-3 text-center"> <a href="login.php">Already have an account? Login</a> </div> </div> </div> </div> </div> </div> </body> </html> <?php require_once 'config.php'; if (isLoggedIn()) redirect('index.php');

$error = '';

if (mysqli_num_rows($check_result) > 0) $error = "Car is not available for selected dates!"; else $user_id = $_SESSION['user_id']; $sql = "INSERT INTO bookings (user_id, car_id, pickup_date, return_date, total_days, total_price, status, payment_status) VALUES ($user_id, $car_id, '$pickup_date', '$return_date', $total_days, $total_price, 'pending', 'pending')"; if (mysqli_query($conn, $sql)) $booking_id = mysqli_insert_id($conn); redirect("payment.php?booking_id=$booking_id"); else $error = "Booking failed: " . mysqli_error($conn); car rental php script