_prepareLocale example

throw new Zend_Locale_Exception('Only full qualified locales can be used as default!');
        }

        if (($quality < 0.1) or ($quality > 100)) {
            throw new Zend_Locale_Exception("Quality must be between 0.1 and 100");
        }

        if ($quality > 1) {
            $quality /= 100;
        }

        $locale = self::_prepareLocale($locale);
        if (isset(self::$_localeData[(string) $locale]) === true) {
            self::$_default = array((string) $locale => $quality);
        } else {
            $elocale = explode('_', (string) $locale);
            if (isset(self::$_localeData[$elocale[0]]) === true) {
                self::$_default = array($elocale[0] => $quality);
            } else {
                throw new Zend_Locale_Exception("Unknown locale '" . (string) $locale . "' can not be set as default!");
            }
        }