'session' => [
```
   // this is the name of the session cookie used for login on the frontend
   'name' => 'me_frontend_session',
```
], name 是替换掉php原有phpsessid会话名称，用来保存会话信息,session就是通过获取cookie会话内容，找到对应的文件，获取数据
'user' => [ 'identityClass' => 'common\models\User', 'enableAutoLogin' => true, 'identityCookie' => ['name' => '_identity-frontend-me', 'httpOnly' => true], ],

3.auth_key 作用cookie登陆，当用户勾选了remember me那么将会生成_identity-frontend-me的一个cookie,内容是经过加密的, 存的内容分别是三个

session-cookie

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