<?php/** * Created by PhpStorm. * Date: 2016/5/27 * Time: 14:16 */namespace frontend/libs;use Yii;use yii/base/Action;use yii/base/ActionFilter;class FilterTest extends ActionFilter{  //在action之前運行，可用來過濾輸入  public function beforeAction($action) {    echo '在調用action前顯示<br/>';    return TRUE;//如果返回值為false,則action不會運行  }  //在action之后運行，可用來過濾輸出  public function afterAction($action, $result) {    return $result.'在調用action后顯示<br/>';//可以對action輸出的$result進行過濾，retun的內容會直接顯示  }}

<?php/** * Created by PhpStorm. * Date: 2016/5/27 * Time: 14:19 */ namespace frontend/controllers; use yii/web/controller;class TestbehaviorController extends Controller{  public function behaviors(){    return [      'test'=>[       'class'=>'frontend/libs/FilterTest',//調用過濾器      ],    ];  }  public function actionFilter(){    return "當前action顯示<br/>";//返回的內容會遞交給過濾器，由afterAction處理  }}