На выходе имеем?
/* Add Meta Content */
if ( $this->_firstPostContent )
{
/* Strip tags on title to ensure multi-mod added code isn't displayed */
$this->registry->output->addMetaTag( 'keywords', strip_tags( trim( $topicData['title'] ) . ' ' . str_replace( "n", " ", str_replace( "r", "", strip_tags( $this->_firstPostContent ) ) ) ), TRUE );
}
$pageData = $this->registry->output->getPaginationProcessedData();
# Trim to 155 chars based on Dan's recommendation
$this->registry->output->addMetaTag( 'description', trim( $pageMeta . sprintf( $this->lang->words['topic_meta_description'], strip_tags( $topicData[''] ), $forumData[''], str_replace( "r", "", $this->_firstPostContent ) ) ), FALSE );