function clearCache($params = array())
 {
     if ($this->isBackend() && !$this->hasPermission('empty_cache')) {
         return;
     }
     if (opendir(MODX_BASE_PATH . 'assets/cache') !== false) {
         $showReport = $params['showReport'] ? $params['showReport'] : false;
         $target = $params['target'] ? $params['target'] : 'pagecache,sitecache';
         include_once MODX_MANAGER_PATH . 'processors/cache_sync.class.processor.php';
         $sync = new synccache();
         $sync->setCachepath(MODX_BASE_PATH . 'assets/cache/');
         $sync->setReport($showReport);
         $sync->setTarget($target);
         $sync->emptyCache();
         // first empty the cache
         return true;
     } else {
         return false;
     }
 }