code: protected function getMD5Folders($strPath)
  	{
  		$arrFiles = array();
  
  		foreach (scan($this->strRootDir . '/' . $strPath) as $strFile)
  		{
  			if (!is_dir($this->strRootDir . '/' . $strPath . '/' . $strFile))
  			{
  				continue;
  			}
  
  			$arrFiles[substr(md5($this->strRootDir . '/' . $strPath . '/' . $strFile), 0, 8)] = 1;
  
  			// Do not use array_merge() here (see #8105)
  			foreach ($this->getMD5Folders($strPath . '/' . $strFile) as $k=>$v)
  			{
  				$arrFiles[$k] = $v;
  			}
  		}
  
  		return $arrFiles;
  	}
docs: Return an array of encrypted folder names
  
  @param string $strPath
  
  @return array