Tags.php

<?php
class Tags implements ICacheDependency {

protected $timestamp;
 protected $tags;

/**
 * В качестве параметров передается список тегов
 *
 * @params tag1, tag2, ..., tagN
 */
 function __construct() {
 $this->tags = func_get_args();
 }

/**
 * Evaluates the dependency by generating and saving the data related with dependency.
 * This method is invoked by cache before writing data into it.
 */
 public function evaluateDependency() {
 $this->timestamp = time();
 }

/**
 * @return boolean whether the dependency has changed.
 */
 public function getHasChanged() {
 $tags = array_map(function($i) { return TaggingBehavior::PREFIX.$i; }, $this->tags);
 $values = Yii::app()->cache->mget($tags);

foreach ($values as $value) {
 if ((integer)$value > $this->timestamp) { return true; }
 }

return false;
 }
}