<?php
namespace app\controllers;
use yii\web\Controller;

/**

• 控制器之请求处理
  */
  class HelloController extends Controller
  {
  $request = \YII::$app->request;

  echo $request->get('id');

  echo $request->post('name',3333);

  if($request->isget){
  echo 'is get method!';
  }

  echo $request->userIp;
  }

/**

• 控制器之响应处理
  */
  class HelloController extends Controller
  {
  $res = \YII::$app->response;

  $res->statusCode = '404'; //设置状态码

  $res->headers->add('pragma','no-cache'); //设置缓存
  $res->headers->set('pragma','max-agge=5'); //设置缓存时间
  $res->headers->remove("pragma");

  $res->headers->add('location','http://www.baidu.com'); //设置跳转

  $this->redirect('http://www.baidu.com',302); //控制器中直接设置跳转

  $res->headers->add('content-disposition','attachment; filename="a.jpg"'); //下载文件

  $res->sendFile('./b.jpg'); //包装的方法来下载文件
  }

/**

• 控制器之session处理
  */
  class HelloController extends Controller
  {
  $session = \YII::$app->session;

  //对象形式
  $session->open(); //打开session
  $session->set('user','张三'); //设置
  $session->get('user'); //获取
  $session->remove('user'); //删除

  //数组形式
  $session['user'] = '张三'; //设置
  echo $session['user']; //获取
  unset($session['user']); //删除

}

/**

• 控制器之cookie处理
  */
  class HelloController extends Controller
  {
  public function actionIndex{
  $cookies = \YII::$app->response->cookies;

  $cookie_data = array('name'='user','value'=>'张三');
  $cookies->add(new Cookie($cookie_data)); //设置cookie
  $cookies->remove('id');  //删除cookie
  
  $cookies = \YII::$app->request->cookies;  //获取cookies值
  $cookies->getValue('user',20); //获取cookie值

  }

}