1、Cookie
Yii2的Cookie主要是通过yiiwebRequest和yiiwebResponse进行操作的 ，通过Yii::$app->response->getCookies()->add()添加Cookie，通过Yii::$app->request->cookies读取Cookie.
1）添加一个Cookie
代码语言：javascript复制<?php
//第一种方法
$cookie = new yiiwebCookie();
$cookie -> name = 'smister'; //cookie的名称
$cookie -> expire = time() 3600; //存活的时间
$cookie -> httpOnly = true; //无法通过js读取cookie
$cookie -> value = 'cookieValue'; //cookie的值
Yii::$app->response->getCookies()->add($cookie);
//第二种方法
$cookie = new yiiwebCookie([
‘name’ => ‘smister’,
‘expire’ => time() 3600,
‘httpOnly ’ => true,
‘value’ => ‘cookieValue’
]);
Yii::$app->response->getCookies()->add($cookie);
?>2) 读取一个Cookie
代码语言：javascript复制<?php
$cookie = Yii::$app->request->cookies;
//返回一个yiiwebCookie对象
$cookie->get(‘smister’);
//直接返回Cookie的值
$cookie->getValue(‘smister’); //$cookie[‘smister’] 其实这样也是可以读取的
//判断一个Cookie是否存在
$cookie->has(‘smister’);
//读取Cookie的总数
$cookie->count();//$cookie->getCount();跟count一样
?>3) 删除Cookie
代码语言：javascript复制<?php
$cookie = Yii::$app->request->cookies->get(‘smister’);
//移除一个Cookie对象
Yii::$app->response->getCookies()->remove($cookie);
//移除所有Cookie，目前好像不太好使
Yii::$app->response->getCookies()->removeAll();
?>4) 注意
对Cookie进行增删改时调用的response , 对Cookie读取时使用的是Request
2、Session
Yii2的Session比较简单 ,直接通过Yii::$app->session进行操作就好了
1) 添加一个session
代码语言：javascript复制<?php
$session = Yii::$app->session;
$session->set('smister_name' , 'myname');
$session->set('smister_array' ,[1,2,3]);
?>2) 读取一个session
代码语言：javascript复制<?php
$session = Yii::$app->session;
//读取一个Session
$session->get('smister_name);
?>3) 删除Session
代码语言：javascript复制<?php
$session = Yii::$app->session;
//删除一个session
$session->remove(‘smister_name’);
//删除所有session
$session->removeAll();
?>PHP/Yii2操作Cookie,常见问题以及注意事项
设置Cookie
PHP
setcookie("name", "Larry", time() 3600);
Yii2
代码语言：javascript复制$cookies = Yii::$app->response->cookies;
$cookies->add(new yiiwebCookie([
'name' => 'name',
'value' => 'Larry',
'expire'=>time() 3600
]));创建名为"name"的cookie，赋值为"Larry",并且规定该cookie一小时后失效
expire这是一个UNIX时间戳，如果设置为0，或省略，该Cookie将在浏览器关闭时消失
获取Cookie
PHP
$name=$_COOKIE["user"]
Yii2
代码语言：javascript复制$cookies = Yii::$app->request->cookies;//注意此处是request
$language = $cookies->get('user', 'defaultName');//设置默认值检查Cookie
PHP
if(isset($_COOKIE["user"])){ }
Yii2
代码语言：javascript复制$cookies = Yii::$app->request->cookies;
if (isset($cookies['user'])){ }
if ($cookies->has('user')){ }
if (isset($cookies['user'])){ }删除Cookie
PHP
代码语言：javascript复制setcookie("user", "", time()-3600);//把失效日期设置为过去1小时
unset($_COOKIE['user']);
###Yii2
$cookies = Yii::$app->request->cookies;
$cookies->remove('user');常见问题
A.Cookie的key不能含“.” 符号，会被解析成“_”，导致具有以上符号的key获取不到Cookie的bug
B.区分Yii2中 Yii::$app->request->cookies 和 Yii::$app->response->cookies 不仔细容易直接复制粘贴了。
1.如果把第一个用来设置Cookie，会报错：`The cookie collection is read only`
2.如果把第二个用来获取Cookie，程序正常执行未发生异常，但会获取不到Cookie，不容易察觉。。。C.Cookie的key区分大小写
Yii::$app->request->cookies 和 Yii::$app->response->cookies在yii里面是分开的，前者是客户端（浏览器cookie）,后者是服务器端。 所以： Yii::$app->request->cookies主要负责读取 Yii::$app->response->cookies主要负责创建
当然两者可以混用，但是根据业务需要， 取客户端cookie之前，在响应中应该写入或修改 如果两者分不清或者使用错误，那就是程序不OOP 思想不到位
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