finde ud af om brugeren bruger Firefox chrome eller IE

<?php

function browser_check($scout=null) {

$programs = array('msie', 'firefox', 'safari', 'webkit', 'opera', 'netscape', 'konqueror', 'gecko');
$programsFull = array('Microsoft Internet Explorer', 'Mozilla Firefox', 'Google Chrome', 'Webkit', 'Opera', 'Netscape', 'Konqueror', 'Gecko');
$scout = strtolower($scout ? $scout : $browser);
$regex = '#(?<browser>' . join('|', $programs) .')[/ ]+(?<version>[0-9]+(?:\.[0-9]+)?)#';

if (!preg_match_all($regex, $scout, $matches)) return array();

$i = count($matches['browser'])-1;

$matches['browser'][$i] = str_replace($programs, $programsFull, $matches['browser'][$i]);

return array($matches['browser'][$i], $matches['version'][$i]);
             
}

$browser = browser_check($_SERVER['HTTP_USER_AGENT']);
   
echo $browser[0] . " " . $browser[1];

?>