namespace frontend\controllers;
use yii;
use yii\web\Controller;
class IndexController 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\PageCache',//整個頁面緩存
       'duration'=>10,//緩存時間
       'only'=>['cache'],//只有index操作會被緩存，即使沒有視圖展示也會緩存
       'dependency'=>[
         'class'=>'yii\caching\DbDependency',
         'sql'=>'select count(*) from user',
       ],
     ]
    ];
  }
  public function actionCache(){
    //片段緩存
    return $this->renderPartial("index");
  }
}

<?php
/**
 * Created by PhpStorm.
 * Date: 2016/5/25
 * Time: 19:37
 */
$duration = 15;
//緩存依賴
  $dependency = [
    'class'=>'yii\caching\FileDependency',
    'fileName'=>'hw.txt',//web目錄下
  ];
//緩存的開關(guān)
$enabled = false;
?>
<?php
  //if($this->beginCache('cache_div',['duration' => $duration])){
  //if($this->beginCache('cache_div',['enabled' => $enabled])){
  if($this->beginCache('cache_div',['dependency' => $dependency])){?>
    <div id="cache_div">
      <div>這里待會會被緩存 哈哈</div>
    </div>
<?php
  $this->endCache();
}?>
<div id="no_cache_div">
  <div>這里不會被緩存 嚕</div>
</div>