From 0aba3305b3505bb8f66c12a0810ebd0c471cc7a2 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
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: https://develop.svn.wordpress.org/trunk@9740 602fd350-edb4-49c9-b593-d223f7449a82
---
 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 a96be515dd..5eef60b13c 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][$id]))
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 0368b09cde..da927ffcfe 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2872,4 +2872,9 @@ function wp_suspend_cache_invalidation($suspend = true) {
 	return $current_suspend;
 }
 
+function wp_clone($object) {
+  return version_compare(phpversion(), '5.0') < 0 ? $object : clone($object);
+}
+
+
 ?>