protected function matchEnv(/*# string */ $name)
    {
        if ('_' === $name[0]) {
            // PHP super globals like _SERVER, _COOKIE etc.
            $pos = strpos($name, '.');
            if (false !== $pos) {
                $pref = substr($name, 0, $pos);
                $suff = substr($name, $pos + 1);
                if (isset($GLOBALS[$pref][$suff])) {
                    return $GLOBALS[$pref][$suff];
                }
            }
        }
        return getenv($name);
    }