From 5c959aa5d8b4a5fd63fc54905b1fc1cb2fe307c5 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Sun, 24 Sep 2017 23:00:08 +0000
Subject: [PATCH] Posts, Post Types: Pass the `order` parameter to
 `get_{$adjacent}_post_sort` filter.

Props manchumahara.
Fixes #41924.

git-svn-id: https://develop.svn.wordpress.org/trunk@41589 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/link-template.php | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/wp-includes/link-template.php b/src/wp-includes/link-template.php
index b541cf473c..eb22284ca3 100644
--- a/src/wp-includes/link-template.php
+++ b/src/wp-includes/link-template.php
@@ -1707,10 +1707,10 @@ function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previo
 	 * @since 2.5.0
 	 * @since 4.4.0 Added the `$taxonomy` and `$post` parameters.
 	 *
-	 * @param string $where          The `WHERE` clause in the SQL.
-	 * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
-	 * @param array  $excluded_terms Array of excluded term IDs.
-	 * @param string $taxonomy       Taxonomy. Used to identify the term used when `$in_same_term` is true.
+	 * @param string  $where          The `WHERE` clause in the SQL.
+	 * @param bool    $in_same_term   Whether post should be in a same taxonomy term.
+	 * @param array   $excluded_terms Array of excluded term IDs.
+	 * @param string  $taxonomy       Taxonomy. Used to identify the term used when `$in_same_term` is true.
 	 * @param WP_Post $post           WP_Post object.
 	 */
 	$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms, $taxonomy, $post );
@@ -1723,11 +1723,13 @@ function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previo
 	 *
 	 * @since 2.5.0
 	 * @since 4.4.0 Added the `$post` parameter.
+	 * @since 4.9.0 Added the `$order` parameter.
 	 *
 	 * @param string $order_by The `ORDER BY` clause in the SQL.
 	 * @param WP_Post $post    WP_Post object.
+	 * @param string  $order   Sort order. 'DESC' for previous post, 'ASC' for next.
 	 */
-	$sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post );
+	$sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post, $order );
 
 	$query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
 	$query_key = 'adjacent_post_' . md5( $query );