Cannot modify header information - headers already sent by (output started at /data/home/syu3197140001/htdocs/yayishuwu/system/core/controllers/SiteController.php:81)
解决方法：
Yii::app()->getRequest()->redirect($url,$terminate,$statusCode);和echo $openid;
跳转和打印同时使用就会报错，保留一个即可，要跳转的话直接删除打印代echo $openid;即可。
本文地址：http://www.yayihouse.com/yayishuwu/chapter/1191