YII框架行为behaviors用法示例

<?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之前运行，可用来过滤输入  public function beforeAction($action) {    echo '在调用action前显示<br/>';    return TRUE;//如果返回值为false,则action不会运行  }  //在action之后运行，可用来过滤输出  public function afterAction($action, $result) {    return $result.'在调用action后显示<br/>';//可以对action输出的$result进行过滤，retun的内容会直接显示  }}

<?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',//调用过滤器      ],    ];  }  public function actionFilter(){    return "当前action显示<br/>";//返回的内容会递交给过滤器，由afterAction处理  }}