Any one know how to restart a windows service using PHP ?

This is what ive done so far ....


--
start.bat
--

@echo off
echo <<NAME OF SERVICE>> is starting ...
echo Starte <<NAME OF SERVICE>> ...
<<SERVICE EXE FILE>> /start

-----

--
stop.bat
--

@echo off
echo <<NAME OF SERVICE>> is stopping ...
echo Stoppe <<NAME OF SERVICE>> ...
<<SERVICE EXE FILE>> /stop

------

My php file


--
service_control.php
--

function start() {
exec("start.bat");
}

function stop() {
exec("stop.bat");
}

----

Any idea why this dnt work ?