From 24ac7c4ac5e93e3d6726a7b15d57e14d7f6e8102 Mon Sep 17 00:00:00 2001
From: Mark Jaquith <mark@wordpress.org>
Date: Fri, 5 Jul 2013 16:40:46 +0000
Subject: [PATCH] Prevent invalid queries in certain empty-array-passing
 meta_query cases.

fixes #22096. props wonderboymusic.

git-svn-id: http://core.svn.wordpress.org/trunk@24563 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/meta.php | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/wp-includes/meta.php b/wp-includes/meta.php
index 367eb6b95d..976fd51ce9 100644
--- a/wp-includes/meta.php
+++ b/wp-includes/meta.php
@@ -678,7 +678,7 @@ class WP_Meta_Query {
 		}
 
 		// WP_Query sets 'meta_value' = '' by default
-		if ( isset( $qv[ 'meta_value' ] ) && '' !== $qv[ 'meta_value' ] )
+		if ( isset( $qv[ 'meta_value' ] ) && '' !== $qv[ 'meta_value' ] && ( ! is_array( $qv[ 'meta_value' ] ) || $qv[ 'meta_value' ] ) )
 			$meta_query[0]['value'] = $qv[ 'meta_value' ];
 
 		if ( !empty( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ) {
@@ -714,6 +714,14 @@ class WP_Meta_Query {
 		$key_only_queries = array();
 		$queries = array();
 
+		// Split out the queries with empty arrays as value
+		foreach ( $this->queries as $k => $q ) {
+			if ( is_array( $q['value'] ) && empty( $q['value'] ) ) {
+				$key_only_queries[$k] = $q;
+				unset( $this->queries[$k] );
+			}
+		}		
+		
 		// Split out the meta_key only queries (we can only do this for OR)
 		if ( 'OR' == $this->relation ) {
 			foreach ( $this->queries as $k => $q ) {