diff --git a/WeChat/Media.php b/WeChat/Media.php
index 684b568..33f9a69 100644
--- a/WeChat/Media.php
+++ b/WeChat/Media.php
@@ -56,8 +56,8 @@ class Media extends BasicWeChat
         $url = "https://api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id={$media_id}";
         $this->registerApi($url, __FUNCTION__, func_get_args());
         $result = Tools::get($url);
-        if (($json = Tools::json2arr($result))) {
-            return $json;
+        if (json_decode($result)) {
+            return Tools::json2arr($result);
         }
         return is_null($outType) ? $result : $outType($result);
     }
@@ -139,8 +139,8 @@ class Media extends BasicWeChat
         $url = "https://api.weixin.qq.com/cgi-bin/material/get_material?access_token=ACCESS_TOKEN";
         $this->registerApi($url, __FUNCTION__, func_get_args());
         $result = Tools::post($url, ['media_id' => $media_id]);
-        if (($json = Tools::json2arr($result))) {
-            return $json;
+        if (json_decode($result)) {
+            return Tools::json2arr($result);
         }
         return is_null($outType) ? $result : $outType($result);
     }
diff --git a/WeMini/Qrcode.php b/WeMini/Qrcode.php
index aa70129..a271712 100644
--- a/WeMini/Qrcode.php
+++ b/WeMini/Qrcode.php
@@ -43,8 +43,8 @@ class Qrcode extends BasicWeChat
         $this->registerApi($url, __FUNCTION__, func_get_args());
         $data = ['path' => $path, 'width' => $width, 'auto_color' => $auto_color, 'line_color' => $line_color];
         $result = Tools::post($url, Tools::arr2json($data));
-        if (($json = Tools::json2arr($result))) {
-            return $json;
+        if (json_decode($result)) {
+            return Tools::json2arr($result);
         }
         return is_null($outType) ? $result : $outType($result);
     }
@@ -68,8 +68,8 @@ class Qrcode extends BasicWeChat
         $data = ['scene' => $scene, 'width' => $width, 'auto_color' => $auto_color, 'page' => $page, 'line_color' => $line_color];
         $this->registerApi($url, __FUNCTION__, func_get_args());
         $result = Tools::post($url, Tools::arr2json($data));
-        if (($json = Tools::json2arr($result))) {
-            return $json;
+        if (json_decode($result)) {
+            return Tools::json2arr($result);
         }
         return is_null($outType) ? $result : $outType($result);
     }
@@ -89,8 +89,8 @@ class Qrcode extends BasicWeChat
         $url = 'https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=ACCESS_TOKEN';
         $this->registerApi($url, __FUNCTION__, func_get_args());
         $result = Tools::post($url, Tools::arr2json(['path' => $path, 'width' => $width]));
-        if (($json = Tools::json2arr($result))) {
-            return $json;
+        if (json_decode($result)) {
+            return Tools::json2arr($result);
         }
         return is_null($outType) ? $result : $outType($result);
     }