setcookie("name", "Larry",time()+3600

$cookies = Yii::$app->response->cookies;
$cookies->add(new \yii\web\Cookie([
     'name' => 'name',
     'value' => 'Larry',
     'expire'=>time()+3600
]));

$name=$_COOKIE["user"]

$cookies = Yii::$app->request->cookies;//注意此处是request
$language = $cookies->get('user', 'defaultValue');

if(isset($_COOKIE["user"])){

$cookies = Yii::$app->request->cookies;
if (isset($cookies['user'])){
if ($cookies->has('user')){
if (isset($cookies['user'])){

setcookie("user", "", time()-3600);//把失效日期设置为过去1小时
unset($_COOKIE['user']);

$cookies = Yii::$app->request->cookies;
$cookies->remove('user');