bbp_get_forum_class( int $forum_id,  $classes = array() )

	function bbp_get_forum_class( $forum_id = 0, $classes = array() ) {
		$bbp       = bbpress();
		$forum_id  = bbp_get_forum_id( $forum_id );
		$count     = isset( $bbp->forum_query->current_post ) ? $bbp->forum_query->current_post : 1;
		$classes   = (array) $classes;

		// Get some classes
		$classes[] = 'loop-item-' . $count;
		$classes[] = ( (int) $count % 2 )                      ? 'even'              : 'odd';
		$classes[] = bbp_is_forum_category( $forum_id )        ? 'status-category'   : '';
		$classes[] = bbp_get_forum_subforum_count( $forum_id ) ? 'bbp-has-subforums' : '';
		$classes[] = bbp_get_forum_parent_id( $forum_id )      ? 'bbp-parent-forum-' . bbp_get_forum_parent_id( $forum_id ) : '';
		$classes[] = 'bbp-forum-status-'     . bbp_get_forum_status( $forum_id );
		$classes[] = 'bbp-forum-visibility-' . bbp_get_forum_visibility( $forum_id );

		// Ditch the empties
		$classes   = array_filter( $classes );
		$classes   = get_post_class( $classes, $forum_id );

		// Filter the results
		$classes   = apply_filters( 'bbp_get_forum_class', $classes, $forum_id );
		$retval    = 'class="' . implode( ' ', $classes ) . '"';

		return $retval;
	}