YII学习总结2

YII基础准备1.命名空间<?php
/****假设有三个同名的类，输出的值为A，B,C****/
use a\b\c\apple;
use d\e\f\apple as bApple;
use g\h\i\apple;

$app = new apple();//A
$app = new bApple();//B
$app = new \Apple();//C  调用的是全局的

2.操作响应

<?php  namespace app\controllers;

use yii\web\Controller;use yii\data\Pagination;use app\models\Country;

class CountryController extends Controller{    public function actionIndex()//不叫方法叫操作    {        $request = \YII::$app->request;//能够获取到url值        echo $request->get(‘id‘,20);//如果没有传参可以设置默认值

        if($request->isGet) //isPut        {            echo "this is get method";        }

        echo $request->userIP;//获取用户IP

        $res = \YII::$app->response;//获取响应状态        $res->statusCode = 404;//人为设置响应状态码

        //$res->headers->add(‘pragma‘,‘no-cache‘);//设置head不设置缓存        $res->headers->set(‘pragma‘,‘max-age=5‘);//设置head缓存5分？秒钟        $res->headers->remove(‘pragma‘);

        //跳转        $res->headers->add("location","http://www.baidu.com");        $this->redirect("http://www.baidu.com",302);

        //文件下载        $res->headers->add(‘content-disposition‘,‘attachment;filename="a.jpg"‘);        $res->sendFile("robots.txt");

    }}