如何在Symfony 3表单组件中接受表状数据

use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('items', CollectionType::class, [
                'entry_type' => TextType::class,
                'allow_add' => true,
                'allow_delete' => true,
                'prototype' => true,
                'prototype_name' => '__item_name__',
            ]);
    }
}

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class MyController extends AbstractController
{
    /**
     * @Route("/form", name="form")
     */
    public function formAction(Request $request)
    {
        $form = $this->createForm(MyFormType::class);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $data = $form->getData();
            // 处理表单数据
        }

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

{# form.html.twig #}
{{ form_start(form) }}
    {{ form_widget(form) }}
    <input type="submit" value="Submit">
{{ form_end(form) }}