<?php

    namespace app\controllers;

    use yii\web\Controller;

    use yii\web\Cookie;

    class HelloController extends Controller{

        //存入cookie和修改cookie

        $cookies = \YII::$app->response->cookies;

        $cookie_data = array('name'=>"user","value"=>"zhangsan");

        $cookies->add(new Cookie($cookie_data));//以'cookieValidationKey' 为基础的加密字符串

        $cookies->remove("id");//移除掉ID的cookie

        //取出cookie的值

        $cookies = \YII::$app->request->cookies;

        $cookies->getValue("user");

        //如果cookie不存在

        $cookies->getValue("user",20);//返回20

    }

?>