YII http缓存

Posted 2020-07-12 雨落知音

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>