public function getSubdirectories()
    {
        $directories = array();
        if ($directoryHandle = opendir($this->m_sPath)) {
            while (false !== ($sFileName = readdir($directoryHandle))) {
                if (
                    $sFileName != "."
                        && $sFileName != ".."
                        && (is_dir($this->m_sPath . "/" . $sFileName))) {

                    array_push($directories, $sFileName);
                }
            }
        }
        sort($directories);
        return $directories;
    }