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專用
header('Cache-Control: post-chedk=0, pre-check=0', false);
//for HTTP/1.0
header('Pragma: no-cache');

<?php
/**
 * Created by PhpStorm.
 * Date: 2016/5/25
 * Time: 20:17
 * http 緩存
 */
namespace frontend\controllers;
use yii;
use yii\web\Controller;
class HttpcacheController extends Controller
{
  public function behaviors()//先于action執(zhí)行,可以用來實現(xiàn)頁面緩存
  {
    return [
      [
        'class'=>'yii\filters\HttpCache',//整個頁面緩存
        'lastModified'=>function(){
          return filemtime('hw.txt');
          //return 22221231231231;//可以在每次修改數(shù)據(jù)時，記入緩存，從緩存讀取
        },
        'etagSeed'=>function(){
          $fp = fopen('hw.txt','r');//hw.txt在web的根目錄下
          $title = fgets($fp);//讀取第一行
          fclose($fp);
          return $title;
          //return 'etagseed2123123';//內(nèi)容
        },
      ]
    ];
  }
  public function actionIndex()
  {
    $content = file_get_contents('hw.txt');
    return $this->renderPartial("index",['new'=>$content]);
  }
}

<?php
/**
 * Created by PhpStorm.
 * Date: 2016/5/25
 * Time: 20:19
 */
?>
<div>
  <div>這是http緩存頁面</div>
  <p><?= $new;?></p>
</div>