Added yii\di\Instance::__set_state() method

framework/di/Instance.php

@@ -161,4 +161,22 @@ class Instance
             return Yii::$container->get($this->id);
         }
     }
+
+    /**
+     * Restores class state after using `var_export()`
+     *
+     * @param array $state
+     * @return Instance
+     * @throws InvalidConfigException when $state property does not contain `id` parameter
+     * @see var_export()
+     * @since 2.0.12
+     */
+    public static function __set_state($state)
+    {
+        if (!isset($state['id'])) {
+            throw new InvalidConfigException('Failed to instantiate class "Instance". Required parameter "id" is missing');
+        }
+
+        return new self($state['id']);
+    }
 }