yii session 和 cookie

 $session = \YII::$app->session;
 //开启session
 $session->open();
 //判断session是不是开启状态
 if($session->isActive){}
 //存放session
 $session->set('user','张三');
 //取出session
 $session->get('user');     
 //删除session
 $session->remove('user');  


 $cookies = \YII::$app->response->cookies;
 $cookie_data = array('name'=>'user','value'=>'zhangsan');
 $cookies->add(new Cookie($cookie_data)); 
 //获取cookie的值 
 $cookies->getValue('user');