2.Controller

1.创建控制器

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2.请求处理

public function actionIndex()    {        //全局类 Yii 的静态属性 $app 中的 request 组件        $request = \Yii::$app->request;        $id = $request->get('id');        //$id = $request->get('id', 20); //如果 id 没有值，默认为20        $request->post('name', 'aaa');        if ($request->isGet) {//        if ($request->isPost) {            echo 'is get';        } else {            echo 'no get';        }        echo $request->userIP;        var_dump($id);    }

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3.响应处理

public function actionResponse()    {        $response = \Yii::$app->response;        //$response->statusCode = '404';//        $response->headers->add('pragma', 'no-cache');//        $response->headers->set('pragma', 'max-age=5');//        $response->headers->remove('pragma');        //跳转//        $response->headers->add('location', 'http://www.baidu.com');//        $this->redirect('http://www.baidu.com', 302);        //文件下载//        $response->headers->add('content-disposition',"attachment;filename='a.jpg'");        $response->sendFile('./robots.txt');//目录为入口文件下    }

$this->redirect(array('test3/test1','name'=>'wjh')); // 站内重定向$this->redirect(array('test3/test1','name','age')); // 1 => string 'name' // 2 => string 'age' $this->redirect('http://www.baidu.com'); //跳转到站外

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4.Session 处理**

public function actionSession()    {        $session = \Yii::$app->session;        $session->open(); //打开session        //判断 session 是否开启        if ($session->isActive) {            echo 'session is active';        } else {            echo 'session no active';        }        //$session->set('key1', 'value1');        //echo $session->get('key1');//        $session->remove('key1');//删除        //$session['user'] = '张三';//以数组形式保存,因为实现了 ArrayAccess 类//        unset($session['user']);//        $session['user'] = '张三';        echo $session['user'];    }

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5.Cookie

public function actionCookie()    {        $cookies = \Yii::$app->response->cookies;        $cookie_data = array(            'name' => 'user',            'value' => '张三',        );//        $cookies->add(new Cookie($cookie_data));//        $cookies->remove('user');        //从请求对象中获取cookie        $cookies = \Yii::$app->request->cookies;        echo $cookies->getValue('user');        //如果 users 没有，则使用 20 作为返回值        echo $cookies->getValue('users' ,20);    }