code: public static function countryCodeThreeToTwo($code)
      {
          if (!array_key_exists($code, self::$_countryCodes)) {
              return false;
          }
  
          return self::$_countryCodes[$code];
      }
docs: Converts three digit country code to two digit one or return false if code does not exists
  
  @param string $code Three digit country code
  @return string|false