YII http缓存

http禁止缓存原理

header('Expires: 0');
header('Last-Modified: '. gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cahe, must-revalidate');
//ie专用
header('Cache-Control: post-chedk=0, pre-check=0', false);
//for HTTP/1.0
header('Pragma: no-cache');

HttpcacheController.php

首先判断的是客户端lastModified,如果最后更新时间没有变化，就不会更新缓存，然后再判断etagSeed

<?php
/**
* Created by PhpStorm.
* Date: 2016/5/25
* Time: 20:17
* http 缓存
*/
namespace frontend\controllers;
use yii;
use yii\web\Controller;

class HttpcacheController extends Controller
{
public function behaviors()//先于action执行,可以用来实现页面缓存
{
return [
[
'class'=>'yii\filters\HttpCache',//整个页面缓存
'lastModified'=>function(){
return filemtime('hw.txt');
//return 22221231231231;//可以在每次修改数据时，记入缓存，从缓存读取
},
'etagSeed'=>function(){
$fp = fopen('hw.txt','r');//hw.txt在web的根目录下
$title = fgets($fp);//读取第一行
fclose($fp);
return $title;
//return 'etagseed2123123';//内容
},
]
];
}
public function actionIndex()
{
$content = file_get_contents('hw.txt');
return $this->renderPartial("index",['new'=>$content]);
}
}

httpcache/index.php

<?php
/**
* Created by PhpStorm.
* Date: 2016/5/25
* Time: 20:19
*/
?>
<div>
<div>这是http缓存页面</div>
<p><?= $new;?></p>
</div>