IntlCallbackChoiceLoader example

public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'choice_loader' => function DOptions $options) {
                if (!class_exists(Intl::class)) {
                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s". Try running "composer require symfony/intl".', static::class));
                }

                $choiceTranslationLocale = $options['choice_translation_locale'];
                $alpha3 = $options['alpha3'];

                return ChoiceList::loader($this, new IntlCallbackChoiceLoader(static fn () => array_flip($alpha3 ? Countries::getAlpha3Names($choiceTranslationLocale) : Countries::getNames($choiceTranslationLocale))), [$choiceTranslationLocale, $alpha3]);
            },
            'choice_translation_domain' => false,
            'choice_translation_locale' => null,
            'alpha3' => false,
            'invalid_message' => 'Please select a valid country.',
        ]);

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

    

class IntlCallbackChoiceLoaderTest extends TestCase
{
    private static IntlCallbackChoiceLoader $loader;
    private static \Closure $value;
    private static array $choices;
    private static array $choiceValues = ['choice_one', 'choice_two'];
    private static LazyChoiceList $lazyChoiceList;

    public static function setUpBeforeClass(): void
    {
        self::$loader = new IntlCallbackChoiceLoader(fn () => self::$choices);
        self::$value = fn ($choice) => $choice->value ?? null;
        self::$choices = [
            (object) ['value' => 'choice_one'],
            (object) ['value' => 'choice_two'],
        ];
        self::$lazyChoiceList = new LazyChoiceList(self::$loader, self::$value);
    }

    public function testLoadChoiceList()
    {
        $this->assertInstanceOf(ChoiceListInterface::class, self::$loader->loadChoiceList(self::$value));
    }

'intl' => false,
            'choice_loader' => function DOptions $options) {
                $input = $options['input'];

                if ($options['intl']) {
                    if (!class_exists(Intl::class)) {
                        throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s" with option "intl=true". Try running "composer require symfony/intl".', static::class));
                    }

                    $choiceTranslationLocale = $options['choice_translation_locale'];

                    return ChoiceList::loader($this, new IntlCallbackChoiceLoader(static fn () => self::getIntlTimezones($input, $choiceTranslationLocale)), [$input, $choiceTranslationLocale]);
                }

                return ChoiceList::lazy($this, static fn () => self::getPhpTimezones($input), $input);
            },
            'choice_translation_domain' => false,
            'choice_translation_locale' => null,
            'input' => 'string',
            'invalid_message' => 'Please select a valid timezone.',
            'regions' => \DateTimeZone::ALL,
        ]);

        

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'choice_loader' => function DOptions $options) {
                if (!class_exists(Intl::class)) {
                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s". Try running "composer require symfony/intl".', static::class));
                }

                $choiceTranslationLocale = $options['choice_translation_locale'];

                return ChoiceList::loader($this, new IntlCallbackChoiceLoader(static fn () => array_flip(Currencies::getNames($choiceTranslationLocale))), $choiceTranslationLocale);
            },
            'choice_translation_domain' => false,
            'choice_translation_locale' => null,
            'invalid_message' => 'Please select a valid currency.',
        ]);

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

    public function getParent(): ?string
    {
        

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'choice_loader' => function DOptions $options) {
                if (!class_exists(Intl::class)) {
                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s". Try running "composer require symfony/intl".', static::class));
                }

                $choiceTranslationLocale = $options['choice_translation_locale'];

                return ChoiceList::loader($this, new IntlCallbackChoiceLoader(static fn () => array_flip(Locales::getNames($choiceTranslationLocale))), $choiceTranslationLocale);
            },
            'choice_translation_domain' => false,
            'choice_translation_locale' => null,
            'invalid_message' => 'Please select a valid locale.',
        ]);

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

    public function getParent(): ?string
    {
        

public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'choice_loader' => function DOptions $options) {
                if (!class_exists(Intl::class)) {
                    throw new LogicException(sprintf('The "symfony/intl" component is required to use "%s". Try running "composer require symfony/intl".', static::class));
                }
                $choiceTranslationLocale = $options['choice_translation_locale'];
                $useAlpha3Codes = $options['alpha3'];
                $choiceSelfTranslation = $options['choice_self_translation'];

                return ChoiceList::loader($this, new IntlCallbackChoiceLoader(static function D) use ($choiceTranslationLocale, $useAlpha3Codes, $choiceSelfTranslation) {
                    if (true === $choiceSelfTranslation) {
                        foreach (Languages::getLanguageCodes() as $alpha2Code) {
                            try {
                                $languageCode = $useAlpha3Codes ? Languages::getAlpha3Code($alpha2Code) : $alpha2Code;
                                $languagesList[$languageCode] = Languages::getName($alpha2Code, $alpha2Code);
                            } catch (MissingResourceException) {
                                // ignore errors like "Couldn't read the indices for the locale 'meta'"                             }
                        }
                    } else {
                        $languagesList = $useAlpha3Codes ? Languages::getAlpha3Names($choiceTranslationLocale) : Languages::getNames($choiceTranslationLocale);
                    }