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<?php
/* --------------------------------------------------------------
CacheTokenHelper.inc.php 2016-06-23
Gambio GmbH
http://www.gambio.de
Copyright (c) 2016 Gambio GmbH
Released under the GNU General Public License (Version 2)
[http://www.gnu.org/licenses/gpl-2.0.html]
--------------------------------------------------------------
*/
/**
* Class CacheTokenHelper
*
* This class returns the cache token string that is saved in the cache directory. This token can be
* used for cache busting of various resources. It is cleared whenever the module data are removed
* from the "cache" directory (also known as persistent data).
*
* @category System
* @package Extensions
* @subpackage Helpers
*/
class CacheTokenHelper implements CacheTokenHelperInterface
{
/**
* Returns the cache token string.
*
* @return string
*/
public function getCacheToken()
{
$dataCache = DataCache::get_instance();
$cacheToken = $dataCache->get_persistent_data('cache_token');
if(empty($cacheToken))
{
$cacheToken = md5(time());
$dataCache->write_persistent_data('cache_token', $cacheToken);
}
return $cacheToken;
}
}