/**
* Set the language tag cookie.
*
* @param string|null $langTag The language tag, or null to reset.
*
* @throws Exception Throws if the language tag is unknown or invalid.
*/
public static function setCookieLanguageTag($langTag)
{
// Make sure the tag is valid or null
if ($langTag !== null && !static::isWithTag($langTag)) {
throw new Exception('Invalid or unknown language tag.');
}
// Set or reset the cookie
if ($langTag !== null) {
CookieManager::setCookie(static::LANGUAGE_COOKIE_NAME, $langTag, static::LANGUAGE_COOKIE_EXPIRE);
} else {
CookieManager::deleteCookie(static::LANGUAGE_COOKIE_NAME);
}
}
