bp_get_the_notification_description()

	function bp_get_the_notification_description() {
		$bp           = buddypress();
		$notification = $bp->notifications->query_loop->notification;

		// Callback function exists.
		if ( isset( $bp->{ $notification->component_name }->notification_callback ) && is_callable( $bp->{ $notification->component_name }->notification_callback ) ) {
			$description = call_user_func( $bp->{ $notification->component_name }->notification_callback, $notification->component_action, $notification->item_id, $notification->secondary_item_id, 1, 'string', $notification->id );

		// @deprecated format_notification_function - 1.5
		} elseif ( isset( $bp->{ $notification->component_name }->format_notification_function ) && function_exists( $bp->{ $notification->component_name }->format_notification_function ) ) {
			$description = call_user_func( $bp->{ $notification->component_name }->format_notification_function, $notification->component_action, $notification->item_id, $notification->secondary_item_id, 1 );

		// Allow non BuddyPress components to hook in.
		} else {

			/** This filter is documented in bp-notifications/bp-notifications-functions.php */
			$description = apply_filters_ref_array( 'bp_notifications_get_notifications_for_user', array( $notification->component_action, $notification->item_id, $notification->secondary_item_id, 1, 'string', $notification->component_action, $notification->component_name, $notification->id ) );
		}

		/**
		 * Filters the full-text description for a specific notification.
		 *
		 * @since BuddyPress 1.9.0
		 * @since BuddyPress 2.3.0 Added the `$notification` parameter.
		 *
		 * @param string $description  Full-text description for a specific notification.
		 * @param object $notification Notification object.
		 */
		return apply_filters( 'bp_get_the_notification_description', $description, $notification );
	}