Yii中特殊行为ActionFilter的使用方法示例

新建 app\\filters\\LoggingFilter 继承 yii\\base\\ActionFilter

LoggingFilter 的功能: 在指定请求的 action 前后各记录一条日志

<?php

namespace app\\filters;

use yii\\base\\ActionFilter;

class LoggingFilter extends ActionFilter
{
 public function beforeAction($action)
 {
  parent::beforeAction($action);

  // To do something
  printf(\'This is a logging for %s\\beforeAction.%s\', $this->getActionId($action), PHP_EOL);

  return true;
 }

 public function afterAction($action, $result)
 {
  parent::afterAction($action, $result);

  // To do something
  printf(\'This is a logging for %s\\afterAction.%s\', $this->getActionId($action), PHP_EOL);

  return true;
 }
}

新建 app\\controllers\\SystemController

<?php

namespace app\\controllers;

use app\\filters\\LoggingFilter;

class SystemController extends \\yii\\web\\Controller
{
 public function behaviors()
 {
  parent::behaviors();

  return [
   \'anchorAuth\' => [
    \'class\' => LoggingFilter::className(),
    \'only\' => [\'test\', \'test-one\'], // 仅对 \'test\'、\'test-one\' 生效
    \'except\' => [\'test-one\'], // 排除 \'test-one\'
   ],
  ];
 }

 public function actionTestOne()
 {
  printf(\'This is a testing for %s.%s\', $this->getRoute(), PHP_EOL);
 }

 public function actionTestTwo()
 {
  printf(\'This is a testing for %s.%s\', $this->getRoute(), PHP_EOL);
 }

 public function actionTest()
 {
  printf(\'This is a testing for %s.%s\', $this->getRoute(), PHP_EOL);
 }
}

测试

请求 http://yii.test/index.php?r=system/test

This is a logging for test\\beforeAction.
This is a testing for system/test.
This is a logging for test\\afterAction.

请求 http://yii.test/index.php?r=system/test-one

This is a testing for system/test-one.

请求 http://yii.test/index.php?r=system/test-two

This is a testing for system/test-two.

总结

Yii 中的 ActionFilter（过滤器）相当于 Laravel 中的 Middleware（中间件），beforeAction 相当于前置中间件，afterAction 相当于后置中间件。