yii对cookie的操作常见的主要有以下几种：
1.设置cookie:
$cookie = new chttpcookie('mycookie','this is my cookie');
$cookie->expire = time()+60*60*24*30; //有限期30天
yii::app()->request->cookies['mycookie']=$cookie;
2.读取cookie:
$cookie = yii::app()->request->getcookies();
echo $cookie['mycookie']->value;
3.销毁cookie:
$cookie = yii::app()->request->getcookies();
unset($cookie[$name]);
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