From 7996d826e3496af110de62e2becf78a2b9b98f3e Mon Sep 17 00:00:00 2001
From: ryan <ryan@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Tue, 27 May 2008 11:33:11 +0000
Subject: [PATCH] Fix serialization when adding meta via update_post_meta().
 Props azaozz. fixes #7018

git-svn-id: http://svn.automattic.com/wordpress/trunk@7995 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/post.php | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/wp-includes/post.php b/wp-includes/post.php
index 9a99a2a4a5..aa12e622f1 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -566,9 +566,6 @@ function get_post_meta($post_id, $key, $single = false) {
 function update_post_meta($post_id, $meta_key, $meta_value, $prev_value = '') {
 	global $wpdb;
 
-	$meta_value = maybe_serialize($meta_value);
-	$prev_value = maybe_serialize($prev_value);
-
 	// expected_slashed ($meta_key)
 	$meta_key = stripslashes($meta_key);
 
@@ -576,11 +573,15 @@ function update_post_meta($post_id, $meta_key, $meta_value, $prev_value = '') {
 		return add_post_meta($post_id, $meta_key, $meta_value);
 	}
 
+	$meta_value = maybe_serialize($meta_value);
+
 	$data  = compact( 'meta_value' );
 	$where = compact( 'meta_key', 'post_id' );
 
-	if ( !empty( $prev_value ) )
+	if ( !empty( $prev_value ) ) {
+		$prev_value = maybe_serialize($prev_value);
 		$where['meta_value'] = $prev_value;
+	}
 
 	$wpdb->update( $wpdb->postmeta, $data, $where );
 	wp_cache_delete($post_id, 'post_meta');