diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7dca4d9..1ea1e3f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 ## CHANGE LOG
 
+### v6.1.2
+
+2013-09-24 issue [#40](https://github.com/qiniu/php-sdk/pull/40)
+
+- 解决与某些 PHP 框架不兼容问题（主要是全局变量的定义）
+- 改善 `json_decode` 的错误提示（有可能 `json_last_error_msg` 函数不存在）
+
+
 ### v6.1.1
 
 2013-07-04 issue [#24](https://github.com/qiniu/php-sdk/pull/24)
diff --git a/qiniu/conf.php b/qiniu/conf.php
index 986b91f9..254137a1 100644
--- a/qiniu/conf.php
+++ b/qiniu/conf.php
@@ -1,5 +1,12 @@
 <?php
 
+global $QINIU_UP_HOST;
+global $QINIU_RS_HOST;
+global $QINIU_RSF_HOST;
+ 
+global $QINIU_ACCESS_KEY;
+global $QINIU_SECRET_KEY;
+
 $QINIU_UP_HOST	= 'http://up.qiniu.com';
 $QINIU_RS_HOST	= 'http://rs.qbox.me';
 $QINIU_RSF_HOST	= 'http://rsf.qbox.me';
diff --git a/qiniu/http.php b/qiniu/http.php
index ec17de03..b3dece96 100644
--- a/qiniu/http.php
+++ b/qiniu/http.php
@@ -182,7 +182,8 @@ function Qiniu_Client_ret($resp) // => ($data, $error)
 		if ($resp->ContentLength !== 0) {
 			$data = json_decode($resp->Body, true);
 			if ($data === null) {
-				$err = new Qiniu_Error(0, json_last_error_msg());
+				$err_msg = function_exists('json_last_error_msg') ? json_last_error_msg() : "error with content:" . $resp->Body;
+				$err = new Qiniu_Error(0, $err_msg);
 				return array(null, $err);
 			}
 		}