Twig extension that adds a filter that returns the country name by its 2-letter ISO code

CountryExtension.php

<?php

/*
 * Installation:
 * =============
 * # services.yml
 * services:
 *     # ...
 *     acme.twig.country_extension:
 *         class: Acme\AcmeBundle\Twig\CountryExtension
 *         tags:
 *             - { name: twig.extension }
 * 
 * Usage:
 * ======
 * {{ entity.countryCode | country }}
 */

namespace Acme\AcmeBundle\Twig;

use Symfony\Component\Intl\Intl;

class CountryExtension extends \Twig_Extension
{
    public function getFilters()
    {
        return array(
            new \Twig_SimpleFilter("country", array($this, "countryFilter")),
        );
    }

    public function countryFilter($countryCode, $locale = "en")
    {
        \Locale::setDefault($locale);

        $countryName = "";
        if ($countryCode) {
            $countryName = Intl::getRegionBundle()->getCountryName($countryCode);
        }
        
        return $countryName ?: $countryCode;
    }

    public function getName()
    {
        return "country_extension";
    }
}

Many thanks for sharing this :) !
It should be officially added in Twig Extension repo

Works great! Many thanks.

Had to remove \Locale::setDefault($locale); to get my default locale.

Super, Thanks!

Just add strtoupper in case of country code small letters.
$countryName = Intl::getRegionBundle()->getCountryName(strtoupper($countryCode));