if (!$topic_id = $post->getVar('topic_id')) {
                $topic_obj->setVar('topic_title', $post->getVar('subject', 'n'));
                $topic_obj->setVar('topic_poster', $post->getVar('uid'));
                $topic_obj->setVar('forum_id', $post->getVar('forum_id'));
                $topic_obj->setVar('topic_time', $post->getVar('post_time'));