function bbp_hide_forum( $forum_id = 0, $current_visibility = '' ) {

	$forum_id = bbp_get_forum_id( $forum_id );

	do_action( 'bbp_hide_forum', $forum_id );

	// Only run queries if visibility is changing
	if ( bbp_get_hidden_status_id() !== $current_visibility ) {

		// Get private forums
		$private = bbp_get_private_forum_ids();

		// Find this forum in the array
		if ( in_array( $forum_id, $private, true ) ) {

			$offset = array_search( $forum_id, $private, true );

			// Splice around it
			array_splice( $private, $offset, 1 );

			// Update private forums minus this one
			update_option( '_bbp_private_forums', bbp_get_unique_array_values( $private ) );
		}

		// Add to '_bbp_hidden_forums' site option
		$hidden   = bbp_get_hidden_forum_ids();
		$hidden[] = $forum_id;
		update_option( '_bbp_hidden_forums', bbp_get_unique_array_values( $hidden ) );

		// Update forums visibility setting
		$bbp_db = bbp_db();
		$bbp_db->update( $bbp_db->posts, array( 'post_status' => bbp_get_hidden_status_id() ), array( 'ID' => $forum_id ) );
		wp_transition_post_status( bbp_get_hidden_status_id(), $current_visibility, get_post( $forum_id ) );
		clean_post_cache( $forum_id );
	}

	do_action( 'bbp_hid_forum',  $forum_id );

	return $forum_id;
}