//首先新建cookie

$cookie = new CHttpCookie('mycookie', 'this is my cookie');

//定义cookie的有效期

$cookie->expire =time()+60*60*24*30; //有限期30天

//把cookie写入cookies使其生效

Yii::app()->request->cookies['mycookie']=$cookie;

注意：CHttpCookie定义的cookie名"mycookie"与Yii::app()->request->cookies['mycookie']中的"mycookie"必须一致，即每次添加cookie值都要写两次cookie名

读取cookie:

$cookie =Yii::app()->request->getCookies();

echo $cookie['mycookie']->value;

销毁cookie:

$cookie =Yii::app()->request->getCookies();

unset($cookie[$name]);