public function MessageGetFoldersById($folder_id) { // $folder_id : string or string array $this->CheckAndSetHeader(__FUNCTION__); $reg_args = $this->getRegularArgs($folder_id, __FUNCTION__); $this->encodeString($reg_args); $results = parent::MessageGetFoldersById($reg_args); $this->methodClose(); return $this->decodeString($results->folder); }