/**
* This method checks whether the given language is available.
* If this is the case, it sets it into the cookie / session.
* Otherwise, the default language is used.
* @param lang new language to use
* @return language after changing
*/
public static function handleLanguageChange($lang)
{
$languages = LanguageHelper::getLanguages();
if (in_array($lang, $languages)) {
$_SESSION[Session::LANGUAGE] = $lang;
setcookie(Session::LANGUAGE, $lang, time() + Config::COOKIE_LIFETIME);
} else {
$_SESSION[Session::LANGUAGE] = Config::DEFAULT_LANGUAGE;
setcookie(Session::LANGUAGE, Config::DEFAULT_LANGUAGE, time() + Config::COOKIE_LIFETIME);
}
return $_SESSION[Session::LANGUAGE];
}