+
+ $alternatives = SearchEngine::getSearchTypes();
+ if ( count( $alternatives ) > 1 ) {
+ if ( $alternatives[0] === null ) {
+ $alternatives[0] = self::BACKEND_NULL_PARAM;
+ }
+ $params['backend'] = array(
+ ApiBase::PARAM_DFLT => $wgSearchType,
+ ApiBase::PARAM_TYPE => $alternatives,
+ );
+ }
+
+ return $params;