给定以下表单类型如何在提交之前呈现我的第二个字段?我尝试使用$form->删除但我总是会收到此错误:Warning: Illegal offset type in isset or empty不确定如何解决这个问题./*** @param FormBuilderInterface $builder* @param array $options*/ public function buildForm(FormBuilderInterface $builder, array $options) {$builder->add('survey', EntityType::class, ['class' => SurveyManager::class,'attr' => ['class' =>...