Symfony intl 如何使用“MissingResourceException”返回默认值

如何解决Symfony intl 如何使用“MissingResourceException”返回默认值

我正在使用 symfony 和 intl 来翻译国家/地区。我想处理国家为空或未翻译的情况。

国家类型.PHP :

// Other code 
...
public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'choice_loader' => function (Options $options) {
                $choiceTranslationLocale = $options['choice_translation_locale'];
                $alpha3 = $options['alpha3'];

                return new IntlCallbackChoiceLoader(function () use ($choiceTranslationLocale,$alpha3) {
                    return array_flip($alpha3 ? Countries::getAlpha3Names($choiceTranslationLocale) : Countries::getNames($choiceTranslationLocale));
                });
            },'choice_translation_domain' => false,'choice_translation_locale' => null,'alpha3' => false,]);

        $resolver->setAllowedTypes('choice_translation_locale',['null','string']);
        $resolver->setAllowedTypes('alpha3','bool');
    }

表单类型：

...
->add('originCountry',CountryType::class,[
                'required' => false,'invalid_message' => 'Le pays est incorrect.','preferred_choices' => ['FR','DE','BE','IT','ES','LU'],])

异常监听器：

if ($exception instanceof MissingResourceException) {
            dd($event);
            $exception = $event->getThrowable();
            $message = sprintf(
                'My Error says: %s with code: %s',$exception->getMessage(),$exception->getCode()
            );
            $response = new Response();
            $response->setContent($message);
            $response->setStatusCode(Response::HTTP_INTERNAL_SERVER_ERROR);
            $event->setResponse($response);
        }

我的问题是，如果国家/地区未翻译或为空，我如何使用异常处理默认值或空值，我想返回空的国家/地区值而不是期望