user agent - Easiest Way OS Detection With PHP?

Question

I'm trying to figure out the visitor's OS is either a Windows, Mac or Linux using PHP(I don't need the version, distro info.. etc). There's several methods out there however they look a bit too complicated for this simple requirement.

Are there any simple ways that could provide this sort of information yet still being quite reliable?

Thanks in advance.

Answer 1

<?php

$agent = $_SERVER['HTTP_USER_AGENT'];

if(preg_match('/Linux/',$agent)) $os = 'Linux';
elseif(preg_match('/Win/',$agent)) $os = 'Windows';
elseif(preg_match('/Mac/',$agent)) $os = 'Mac';
else $os = 'UnKnown';


echo $os;

?>