Eccube\Form\Type\NameType::buildForm PHP Method

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $options['lastname_options']['required'] = $options['required'];
        $options['firstname_options']['required'] = $options['required'];
        // required の場合は NotBlank も追加する
        if ($options['required']) {
            $options['lastname_options']['constraints'] = array_merge(array(new Assert\NotBlank(array())), $options['lastname_options']['constraints']);
            $options['firstname_options']['constraints'] = array_merge(array(new Assert\NotBlank(array())), $options['firstname_options']['constraints']);
        }
        if (!isset($options['options']['error_bubbling'])) {
            $options['options']['error_bubbling'] = $options['error_bubbling'];
        }
        if (empty($options['lastname_name'])) {
            $options['lastname_name'] = $builder->getName() . '01';
        }
        if (empty($options['firstname_name'])) {
            $options['firstname_name'] = $builder->getName() . '02';
        }
        $builder->add($options['lastname_name'], 'text', array_merge_recursive($options['options'], $options['lastname_options']))->add($options['firstname_name'], 'text', array_merge_recursive($options['options'], $options['firstname_options']));
        $builder->setAttribute('lastname_name', $options['lastname_name']);
        $builder->setAttribute('firstname_name', $options['firstname_name']);
    }