<?php

namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\EmailType;
use Symfony\Component\Form\Extension\Core\Type\PasswordType;
use Symfony\Component\Form\FormBuilderInterface;

class RegisterFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('email', EmailType::class)
            ->add('password', PasswordType::class)
            ->add('name')
        ;
    }
}

<?php

namespace App\Controller;

use App\Form\RegisterFormType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
//...

class UserController extends AbstractController
{
    public function register(EntityManagerInterface $em, Request $request): Response
    {
        $form = $this->createForm(RegisterFormType::class);
        $form->handleRequest($request);
        if ($form->isSubmitted() && $form->isValid()) {
            die("Submitted data is valid");
        }
        return $this->render('user/register.html.twig', [
            'registerForm' => $form->createView()
        ]);
    }
}