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

class?HelloController?extends?Controller{
????public?function?actionIndex()
????{
????????return?$this->renderPartial('index');
}
}

<?php
namespace?app\controllers;

use?yii\web\Controller;

class?HelloController?extends?Controller{
????public?function?actionIndex()
????{
???????$session?=?\YII::$app->session;

//????????if($session->getIsActive()){//判斷session是否開啟
//????????????echo?'session?is?active';
//????????}else{
//????????????$session->open();//開啟session
//????????}
????????//存數據?存儲位置是php.ini?文件里的session.save_path參數的值
????????//$session->set('name','高大雷');
????????//$session['name']='高大雷';

????????//取數據
????????//echo?$session->get('name');
????????//echo?$session['name'];

????????//銷毀數據
???????//?$session->remove('name');
????????//unset($session['name']);
????}
}

<?php
namespace?app\controllers;

use?yii\web\Controller;

class?HelloController?extends?Controller{
????public?function?actionIndex()
????{
????????//http?header頭修改設置
????????$response=\YII::$app->response;
????????//$response->statusCode='404';
????????//$response->headers->add('pragma','no-cache');
????????//$response->headers->set('pragma','max-age=5');
????????//$response->headers->set('X-Powered-By','高大雷');
????????//$response->headers->remove('pragma');

????????//跳轉
????????//$response->headers->add('location','http://www.baidu.com');//似乎沒用
????????
????????//$this->redirect('http://www.baidu.com',302);//可用

????????//文件下載
????????//$response->headers->add('content-disposition','attachment;filename=a.jpg');
????????$response->sendFile('./robots.txt');//這里是想想對index.php文件的位置
????}
}

<?php
namespace?app\controllers;

use?yii\web\Controller;

class?HelloController?extends?Controller{
????public?function?actionIndex()
????{
????????$resquest=\YII::$app->request;

????????if($resquest->isGet){//判斷是否get請求
????????????//第二參數為默認值
????????????echo?$resquest?->get('id',80);
????????}elseif($resquest->isPost){//判斷是否post請求
????????????
????????????echo?$resquest->post('name',"高大雷");
????????}
????????//獲取用戶ip
????????echo?$resquest->userIP;
????????//echo?"HelloWord";
????}
}

return $this->renderPartial('index.php');? ?在控制器中顯示視圖的頁面

兩種方式獲取數據

$result = 表名::find()->where(['id'=>1])->all();查詢id=1的數據

$result = 表名::find()->where(['>','id',0])->all();查詢id>0的數據?

表名::find()->where('between','id',1,2)->all();查詢1<=id<=2的數據?

表名::find()->where('like','title','title1')->asArray()->all; 查詢 title like "%title1%"http://把查詢到的數據， 原來每條數據是保存為對象的，把對象轉化為數組保存，可以降低內存使用

一張表一個模型，執行數據庫的操作時，在控制器中的操作中聯系相對應的模型

布局文件存放網頁中相同的部分

Yii應用的靜態結構

模型層 命名? 和數據庫名字一樣

$變量名 = \Yii:：$app->request-->post('id',20);

通過POST去請求id的值 如果獲取不到Id? 那么id會變成20

class 控制器名 extends 命名空間控制器{

????public function action方法名（）{

????}

}

use a\b\c\user

實例化: $user = new user();

use d\e\f\user 因為和上面沖突

因此 可用另外的寫法? ? use d\e\f\user as Bapple;

這樣 實例化這個的話 就可以寫成： $apple = new Bapple();