From 4c9e7f81e18480cfd879b7529e44cc40cc5c0180 Mon Sep 17 00:00:00 2001
From: Andrew Nacin <wp@andrewnacin.com>
Date: Wed, 26 Feb 2014 04:15:18 +0000
Subject: [PATCH] wpdb: set dbh to null when the mysqli connection fails. see
 #21663.

Built from https://develop.svn.wordpress.org/trunk@27277


git-svn-id: http://core.svn.wordpress.org/trunk@27133 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/wp-db.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 667ee3b25a..4bba086d3f 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -1327,6 +1327,10 @@ class wpdb {
 			} else {
 				@mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
 			}
+
+			if ( $this->dbh->connect_errno ) {
+				$this->dbh = null;
+			}
 		} else {
 			if ( WP_DEBUG ) {
 				$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );