Source Reference:

• Component: bbPress :: bbp-topic

  File: /bbp-includes/bbp-topic-template.php :: Trac Source Line: 614

  			$excerpt = bbp_get_topic_content( $topic_id );
  
  		$excerpt = trim( strip_tags( $excerpt ) );
  
  		if ( !empty( $length ) && strlen( $excerpt ) > $length ) {
  			$excerpt  = substr( $excerpt, 0, $length - 1 );
  			$excerpt .= '…';
  		}
  
  		return apply_filters( 'bbp_get_topic_excerpt', $excerpt, $topic_id, $length );
  	}
  
  /**
   * Output pagination links of a topic within the topic loop
   *
   * @since bbPress (r2966)
   *
   * @param mixed $args See {@link bbp_get_topic_pagination()}
   * @uses bbp_get_topic_pagination() To get the topic pagination links
   */