public static function getCountries()
    {
        // Put frequently country at the top
        $countries = array();
        $frequently = array();

        foreach (Convert::$aCountries as $k => $country) {
            //echo strtolower($k) . '<br />';
            if (in_array(strtolower($k), ['be', 'fr', 'gb'])) {
                $frequently[strtolower($k)] = $country;
            } else {
                $countries[strtolower($k)] = $country;
            }
        }

        return array_merge($frequently, $countries);
    }