code review by fei.hong: do test yuanxiao huodong redirect

@@ -254,7 +254,16 @@ class YuanxiaoController extends HuodongAction
      */
     private function checkNeedShare()
     {
-        if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false || $this->_isApp) {
+        // Android 
+        if ($this->_isApp) {
+            return true;
+        }
+        // IPhone
+        elseif (null !== $this->get('openby:yohobuy', null)) {
+            return true;
+        }
+        // 微信
+        elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {
             return true;
         }