diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index e567c4deae..5564628848 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -74,6 +74,7 @@ Yii Framework 2 Change Log
 - Chg #9411: `DetailView` now automatically sets container tag ID in case it's not specified (samdark)
 - Chg #9953: `TimestampBehavior::getValue()` changed to make value processing consistent with `AttributeBehavior::getValue()` (silverfire)
 - Chg #6419: Added `yii\web\ErrorHandler::displayVars` make list of displayed vars customizable. `$_ENV` and `$_SERVER` are not displayed by default anymore (silverfire)
+- Chg #9528: Traversable objects are now formatted as arrays in `yii\web\XmlResponseFormatter` to support SPL objects and Generators (MaXL-ru)
 - New #10083: Added wrapper for PHP webserver (samdark)
 - New: Added new requirement: ICU Data version >= 49.1 (SilverFire)
 
diff --git a/framework/UPGRADE.md b/framework/UPGRADE.md
index 1564528def..de83f0d808 100644
--- a/framework/UPGRADE.md
+++ b/framework/UPGRADE.md
@@ -34,6 +34,8 @@ initialization to support wider range of allowed characters. Because of this cha
 the event.
   - If you overrode the `yii.confirm` function and accessed the `yii` object through `this`, you must access it
 with global variable `yii` instead.
+* Traversable objects are now formatted as arrays in XML response to support SPL objects and Generators. Previous
+  behavior could be turned on by setting `XmlResponseFormatter::$useTraversableAsArray` to `false`.
 
 Upgrade from Yii 2.0.5
 ----------------------
diff --git a/framework/web/XmlResponseFormatter.php b/framework/web/XmlResponseFormatter.php
index ba9c5d304f..6c0b43fc64 100644
--- a/framework/web/XmlResponseFormatter.php
+++ b/framework/web/XmlResponseFormatter.php
@@ -46,6 +46,7 @@ class XmlResponseFormatter extends Component implements ResponseFormatterInterfa
     public $itemTag = 'item';
     /**
      * @var boolean whether to enable to interpret implemented \Traversable interface objects as array
+     * @since 2.0.7
      */
     public $useTraversableAsArray = true;
 
diff --git a/tests/framework/web/JsonResponseFormatterTest.php b/tests/framework/web/JsonResponseFormatterTest.php
index ca49f48499..c13d76c510 100644
--- a/tests/framework/web/JsonResponseFormatterTest.php
+++ b/tests/framework/web/JsonResponseFormatterTest.php
@@ -73,4 +73,15 @@ class JsonResponseFormatterTest extends FormatterTest
             ], '{"0":{"id":123,"title":"<>"},"a":{"id":456,"title":"def"}}'],
         ];
     }
+
+    public function formatTraversableObjectDataProvider()
+    {
+        $postsStack = new \SplStack();
+        $postsStack->push(new Post(915, 'record1'));
+        $postsStack->push(new Post(456, 'record2'));
+
+        return [
+            [$postsStack, '{"1":{"id":456,"title":"record2"},"0":{"id":915,"title":"record1"}}']
+        ];
+    }
 }