如何在ChoiceType Symfony表单生成器中默认选中某些复选框选项？

use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('myCheckboxField', ChoiceType::class, [
                'choices' => [
                    'Option 1' => 'option1',
                    'Option 2' => 'option2',
                    'Option 3' => 'option3',
                ],
                'expanded' => true,
                'multiple' => true,
                'data' => ['option1', 'option3'], // 默认选中Option 1和Option 3
            ]);
    }

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

请注意，以上链接仅供参考，具体的产品选择应根据实际需求和情况进行。