From f6c2de0141f0a4deeb22f1f2643eab03dc647ae5 Mon Sep 17 00:00:00 2001
From: ryan <ryan@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Mon, 17 Nov 2008 21:01:12 +0000
Subject: [PATCH] Use clone to break object refs when setting and getting
 cache. see #8146 #8191

git-svn-id: http://svn.automattic.com/wordpress/trunk@9740 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/cache.php     | 8 +++++++-
 wp-includes/functions.php | 5 +++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index a96be515d..5eef60b13 100644
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -313,7 +313,10 @@ class WP_Object_Cache {
 
 		if (isset ($this->cache[$group][$id])) {
 			$this->cache_hits += 1;
-			return $this->cache[$group][$id];
+			if ( is_object($this->cache[$group][$id]) )
+				return wp_clone($this->cache[$group][$id]);
+			else
+				return $this->cache[$group][$id];
 		}
 
 		if ( isset ($this->non_existant_objects[$group][$id]) )
@@ -373,6 +376,9 @@ class WP_Object_Cache {
 		if (NULL === $data)
 			$data = '';
 
+		if ( is_object($data) )
+			$data = wp_clone($data);
+
 		$this->cache[$group][$id] = $data;
 
 		if(isset($this->non_existant_objects[$group][$id]))
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 0368b09cd..da927ffcf 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2872,4 +2872,9 @@ function wp_suspend_cache_invalidation($suspend = true) {
 	return $current_suspend;
 }
 
+function wp_clone($object) {
+  return version_compare(phpversion(), '5.0') < 0 ? $object : clone($object);
+}
+
+
 ?>