From 5166e06e08a3e2aa016857fe35c402f897db43aa Mon Sep 17 00:00:00 2001
From: Andrew Nicols <andrew@nicols.co.uk>
Date: Thu, 4 May 2017 13:09:13 +0800
Subject: [PATCH] MDL-56675 cachestore_memcached: Check all connected servers
 for support

---
 cache/stores/memcached/lib.php | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/cache/stores/memcached/lib.php b/cache/stores/memcached/lib.php
index e8a29eb58b7..5e0077a79d4 100644
--- a/cache/stores/memcached/lib.php
+++ b/cache/stores/memcached/lib.php
@@ -261,9 +261,13 @@ class cachestore_memcached extends cache_store implements cache_is_configurable
                 $safecombination = true;
             }
 
-            if (!$safecombination && (version_compare($this->connection->getVersion(), '1.4.22') <= 0)) {
-                // This is memcached server version <= 1.4.22 which is a safe combination.
-                $safecombination = true;
+            if (!$safecombination) {
+                $allsafe = true;
+                foreach ($this->connection->getVersion() as $version) {
+                    $allsafe = $allsafe && (version_compare($version, '1.4.22') <= 0);
+                }
+                // All memcached servers connected are version <= 1.4.22 which is a safe combination.
+                $safecombination = $allsafe;
             }
 
             if (!$safecombination) {