From 350cfba6c898165515d6a5df7e50dd600c9be1a4 Mon Sep 17 00:00:00 2001
From: Gary Pendergast <pento@git.wordpress.org>
Date: Mon, 9 Feb 2015 22:27:43 +0000
Subject: [PATCH] WPDB: When checking to see if we can use utf8mb4, we also
 need to make sure PHP's MySQL client library is capable of using utf8mb4.

See #21212



git-svn-id: https://develop.svn.wordpress.org/trunk@31391 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/wp-db.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index c8f456ef63..539324091d 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -2801,7 +2801,14 @@ class wpdb {
 			case 'set_charset' :
 				return version_compare( $version, '5.0.7', '>=' );
 			case 'utf8mb4' :      // @since 4.1.0
-				return version_compare( $version, '5.5.3', '>=' );
+				if ( version_compare( $version, '5.5.3', '<' ) ) {
+					return false;
+				}
+				if ( $this->use_mysqli ) {
+					return mysqli_get_client_version( $this->dbh ) >= 50503;
+				} else {
+					return mysql_get_client_version( $this->dbh ) >= 50503;
+				}
 		}
 
 		return false;