CountryType.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form\Extension\Core\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\ChoiceList\Loader\IntlCallbackChoiceLoader;
use Symfony\Component\Intl\Countries;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;

class CountryType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    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');
    }

    /**
     * {@inheritdoc}
     */
    public function getParent()
    {
        return ChoiceType::class;
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'country';
    }
}