$payload = array('error' => $instanceId);
         }
         $http->sendJsonWithHeaders($payload);
     }
     break;
 case 'load_stop_words_by_lang':
     if (PMF_Language::isASupportedLanguage($stopwordsLang)) {
         $stopwordsList = $stopwords->getByLang($stopwordsLang);
         $payload = $stopwordsList;
         $http->sendJsonWithHeaders($payload);
     }
     break;
 case 'delete_stop_word':
     if (null != $stopwordId && PMF_Language::isASupportedLanguage($stopwordsLang)) {
         $stopwords->setLanguage($stopwordsLang);
         $stopwords->remove($stopwordId);
     }
     break;
 case 'save_stop_word':
     if (!isset($_SESSION['phpmyfaq_csrf_token']) || $_SESSION['phpmyfaq_csrf_token'] !== $csrfToken) {
         $http->sendJsonWithHeaders(array('error' => $PMF_LANG['err_NotAuth']));
         exit(1);
     }
     if (null != $stopword && PMF_Language::isASupportedLanguage($stopwordsLang)) {
         $stopwords->setLanguage($stopwordsLang);
         if (null !== $stopwordId && -1 < $stopwordId) {
             echo $stopwords->update($stopwordId, $stopword);
         } elseif (!$stopwords->match($stopword)) {
             echo $stopwords->add($stopword);
         } else {
         }