Intl Twig localized filters

AppExtension.php

<?php


namespace AppBundle\Twig {

    use Symfony\Component\Intl\Exception\RuntimeException;

    class AppExtension extends \Twig_Extension
    {
        public function __construct()
        {
            if (!class_exists('IntlDateFormatter')) {
                throw new RuntimeException('The intl extension is needed to use intl-based filters.');
            }
        }

        /**
         * Returns a list of filters to add to the existing list.
         *
         * @return array An array of filters
         */
        public function getFilters()
        {
            return array(
                new \Twig_SimpleFilter('localizedlanguage', 'twig_localized_language_filter'),
                new \Twig_SimpleFilter('localizedcountry', 'twig_localized_country_filter')
            );
        }

        /**
         * Returns the name of the extension.
         *
         * @return string The extension name
         */
        public function getName()
        {
            return 'app_extension';
        }
    }

}



namespace  {

    function twig_localized_language_filter($language_iso, $locale = null)
    {

        static $formatter;

        $locale = $locale !== null ? $locale : \Locale::getDefault();


        $formatter = \Locale::getDisplayLanguage ( $language_iso, $locale );

        return $formatter;

    }

    function twig_localized_country_filter($country_iso, $locale = null)
    {

        static $formatter;

        $locale = $locale !== null ? $locale : \Locale::getDefault();



        $formatter = \Locale::getDisplayRegion('und_' .  $country_iso, $locale );

        return $formatter;

    }

}