code: public static function clearTmp($clearFolderPath = '')
      {
          $folderPath = self::_getFolderToClear($clearFolderPath);
          $directoryHandler = opendir($folderPath);
  
          if (!empty($directoryHandler)) {
              while (false !== ($fileName = readdir($directoryHandler))) {
                  $filePath = $folderPath . DIRECTORY_SEPARATOR . $fileName;
                  self::_clear($fileName, $filePath);
              }
  
              closedir($directoryHandler);
          }
  
          return true;
      }
docs: Clean temp folder content.
  
  @param string $clearFolderPath Sub-folder path to delete from. Should be a full, valid path inside temp folder.
  
  @return boolean