if (!empty($using)) { switch ($using) { case 'plane': $vehicle = new Plane(); break; case 'car': $vehicle = new Car(); break; case 'bike': $vehicle = new Bike(); break; } } $passengers = filter_var($_POST["passengers"], FILTER_SANITIZE_NUMBER_INT); if ($passengers != "") { $max = $vehicle->getMaxPassengers(); if ($passengers <= $max) { header("Location: http://192.168.33.10/Day2/success.php"); exit; } else { $errors = "You can't travel on a " . $vehicle->getTypeVehicle() . " with " . $passengers . " passengers. The maximun number of allowed passengers for the selected transport is " . $vehicle->getMaxPassengers() . "."; } } else { $errors = "Please insert a number valid"; } } } ?> <!DOCTYPE html> <html>