如何在Symfony 中获取表单中的用户数据？

// src/Form/UserType.php
namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('username')
            ->add('email')
            ->add('password')
        ;
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => User::class,
        ]);
    }
}

// src/Controller/UserController.php
namespace App\Controller;

use App\Entity\User;
use App\Form\UserType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class UserController extends AbstractController
{
    /**
     * @Route("/register", name="register")
     */
    public function register(Request $request): Response
    {
        $user = new User();
        $form = $this->createForm(UserType::class, $user);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // 获取表单数据
            $userData = $form->getData();

            // 处理数据，例如保存到数据库

            return $this->redirectToRoute('homepage');
        }

        return $this->render('user/register.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}

{# templates/user/register.html.twig #}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>Register</h1>

    {{ form(form) }}
{% endblock %}