code review by hf: fixes some bugs

@@ -129,7 +129,7 @@ class Helpers
      */
     public static function getShoppingKeyByCookie()
     {
-        $cookie = isset($_COOKIE['_Spk']) ? $_COOKIE['_Spk'] : '';
+        $cookie = isset($_COOKIE['_SPK']) ? $_COOKIE['_SPK'] : '';
 
         return $cookie;
     }

@@ -71,7 +71,7 @@ class HomeModel
 
     /**
      * 设置选择的频道保存到浏览器COOKIE
-     * (已废弃，改成ＪＳ设置)
+     * (已废弃，改成JS设置)
      * 
      * @param string $cookie
      * @return void

@@ -456,8 +456,8 @@ class IndexController extends AbstractAction
             $result = CartModel::addToCart($productSku, $buyNumber, $goodsType, $isEdit, $promotionId, $uid, $shoppingKey);
 
             // 设置加入购物车凭证到客户端浏览器
-            if (!$shoppingKey && isset($result['data']['shopping_key'])) {
-                $this->setCookie('_Spk', $result['data']['shopping_key']);
+            if (empty($shoppingKey) && isset($result['data']['shopping_key'])) {
+                $this->setCookie('_SPK', $result['data']['shopping_key'], time() + 86400 * 360);
             }
         }
 

@@ -77,6 +77,7 @@ class LoginController extends AbstractAction
         // 清除客户端
         $this->setCookie('_UID', '');
         $this->setCookie('_TOKEN', '');
+        $this->setCookie('_SPK', '');
         // 清除服务端会话
         $this->setSession('_TOKEN', '');