<?php 
   
  class UserController extends CController{ 
    ** 
     * 第一步：创建动作 
     */ 
      function actionAdd(){  
        echo "actionAdd"; 
      } 
      /** 
      * 第二步：创建基于方法的过滤器 
       */ 
      public function filterAddFilter($filterChain) { 
        echo "基于方法的过滤器UserController.filterAdd<br>"; 
        $filterChain->run(); 
      } 
      /** 
      * 第三步：重写父类CController的filters()方法，定义过滤器与动作的关系 
      * @see CController::filters() 
      */ 
      public function filters(){ 
        return array( 
      //定义过滤器与动作的关联关系 
          'addFilter + add', 
//         array( 
//             'application.filters.TestFilter',           
//         ), 
           
      ); 
    } 
  } 

<?php 
class TestFilter extends CFilter{ 
  /** 
   * Performs the pre-action filtering. 
   * @param CFilterChain $filterChain the filter chain that the filter is on. 
   * @return boolean whether the filtering process should continue and the action 
   * should be executed. 
   */ 
  protected function preFilter($filterChain) 
  { 
    echo "--->TestFilter.preFilter.<br>"; 
    return true; 
  } 
   
  /** 
   * Performs the post-action filtering. 
   * @param CFilterChain $filterChain the filter chain that the filter is on. 
   */ 
  protected function postFilter($filterChain) 
  { 
    echo "--->TestFilter.postFilter.<br>"; 
  } 
} 

/**
* 第三步：重写父类CController的filters()方法，定义过滤器与动作的关系 
* @see CController::filters() 
*/ 
ublic function filters(){ 
return array( 
  //定义过滤器与动作的关联关系 
    'addFilter + add', 
      array( 
          'application.filters.TestFilter',           
      ), 
     
); 

public function behaviors()
{
  return [
    [
      'class' => 'yii\filters\HttpCache',
      'only' => ['index', 'view'],
      'lastModified' => function ($action, $params) {
        $q = new \yii\db\Query();
        return $q->from('user')->max('updated_at');
      },
    ],
  ];
}

namespace app\components;

use Yii;
use yii\base\ActionFilter;

class ActionTimeFilter extends ActionFilter
{
  private $_startTime;

  public function beforeAction($action)
  {
    $this->_startTime = microtime(true);
    return parent::beforeAction($action);
  }

  public function afterAction($action, $result)
  {
    $time = microtime(true) - $this->_startTime;
    Yii::trace("Action '{$action->uniqueId}' spent $time second.");
    return parent::afterAction($action, $result);
  }
}

use yii\filters\AccessControl;

public function behaviors()
{
  return [
    'access' => [
      'class' => AccessControl::className(),
      'only' => ['create', 'update'],
      'rules' => [
        // 允许认证用户
        [
          'allow' => true,
          'roles' => ['@'],
        ],
        // 默认禁止其他用户
      ],
    ],
  ];
}

use yii\filters\auth\HttpBasicAuth;

public function behaviors()
{
  return [
    'basicAuth' => [
      'class' => HttpBasicAuth::className(),
    ],
  ];
}

use yii\filters\ContentNegotiator;
use yii\web\Response;

public function behaviors()
{
  return [
    [
      'class' => ContentNegotiator::className(),
      'formats' => [
        'application/json' => Response::FORMAT_JSON,
        'application/xml' => Response::FORMAT_XML,
      ],
      'languages' => [
        'en-US',
        'de',
      ],
    ],
  ];
}

use yii\filters\ContentNegotiator;
use yii\web\Response;

[
  'bootstrap' => [
    [
      'class' => ContentNegotiator::className(),
      'formats' => [
        'application/json' => Response::FORMAT_JSON,
        'application/xml' => Response::FORMAT_XML,
      ],
      'languages' => [
        'en-US',
        'de',
      ],
    ],
  ],
];

use yii\filters\HttpCache;

public function behaviors()
{
  return [
    [
      'class' => HttpCache::className(),
      'only' => ['index'],
      'lastModified' => function ($action, $params) {
        $q = new \yii\db\Query();
        return $q->from('user')->max('updated_at');
      },
    ],
  ];
}

use yii\filters\PageCache;
use yii\caching\DbDependency;

public function behaviors()
{
  return [
    'pageCache' => [
      'class' => PageCache::className(),
      'only' => ['index'],
      'duration' => 60,
      'dependency' => [
        'class' => DbDependency::className(),
        'sql' => 'SELECT COUNT(*) FROM post',
      ],
      'variations' => [
        \Yii::$app->language,
      ]
    ],
  ];
}

use yii\filters\VerbFilter;

public function behaviors()
{
  return [
    'verbs' => [
      'class' => VerbFilter::className(),
      'actions' => [
        'index' => ['get'],
        'view'  => ['get'],
        'create' => ['get', 'post'],
        'update' => ['get', 'put', 'post'],
        'delete' => ['post', 'delete'],
      ],
    ],
  ];
}

use yii\filters\Cors;
use yii\helpers\ArrayHelper;

public function behaviors()
{
  return ArrayHelper::merge([
    [
      'class' => Cors::className(),
    ],
  ], parent::behaviors());
}

use yii\filters\Cors;
use yii\helpers\ArrayHelper;

public function behaviors()
{
  return ArrayHelper::merge([
    [
      'class' => Cors::className(),
      'cors' => [
        'Origin' => ['http://www.myserver.net'],
        'Access-Control-Request-Method' => ['GET', 'HEAD', 'OPTIONS'],
      ],
    ],
  ], parent::behaviors());
}

use yii\filters\Cors;
use yii\helpers\ArrayHelper;

public function behaviors()
{
  return ArrayHelper::merge([
    [
      'class' => Cors::className(),
      'cors' => [
        'Origin' => ['http://www.myserver.net'],
        'Access-Control-Request-Method' => ['GET', 'HEAD', 'OPTIONS'],
      ],
      'actions' => [
        'login' => [
          'Access-Control-Allow-Credentials' => true,
        ]
      ]
    ],
  ], parent::behaviors());
}