Browser Detection Class - PHP

Demo
[sourcecode language="php"]
class Browser
{
private $u_agent;
private $bname;
private $platform;
private $version;

public function __construct()
{
$this->u_agent = $_SERVER['HTTP_USER_AGENT'];
$this->bname = 'Unknown';
$this->platform = 'Unknown';
$this->version= "";
}
public function getBrowser()
{


//First get the platform?
if (preg_match('/linux/i', $this->u_agent)) {
$this->platform = 'linux';
}
elseif (preg_match('/macintosh|mac os x/i', $this->u_agent)) {
$this->platform = 'mac';
}
elseif (preg_match('/windows|win32/i', $this->u_agent)) {
$this->platform = 'windows';
}

// Next get the name of the useragent yes seperately and for good reason
if(preg_match('/MSIE/i',$this->u_agent) && !preg_match('/Opera/i',$this->u_agent))
{
$this->bname = 'Internet Explorer';
$this->ub = "MSIE";
}
elseif(preg_match('/Firefox/i',$this->u_agent))
{
$this->bname = 'Mozilla Firefox';
$this->ub = "Firefox";
}
elseif(preg_match('/Chrome/i',$this->u_agent))
{
$this->bname = 'Google Chrome';
$this->ub = "Chrome";
}
elseif(preg_match('/Safari/i',$this->u_agent))
{
$this->bname = 'Apple Safari';
$this->ub = "Safari";
}
elseif(preg_match('/Opera/i',$this->u_agent))
{
$this->bname = 'Opera';
$this->ub = "Opera";
}
elseif(preg_match('/Netscape/i',$this->u_agent))
{
$this->bname = 'Netscape';
$this->ub = "Netscape";
}

// finally get the correct version number
$known = array('Version', $this->ub, 'other');
$pattern = '#(?<browser>' . join('|', $known) .
')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
if (!preg_match_all($pattern, $this->u_agent, $matches)) {
// we have no matching number just continue
}

// see how many we have
$i = count($matches['browser']);
if ($i != 1) {
//we will have two since we are not using 'other' argument yet
//see if version is before or after the name
if (strripos($this->u_agent,"Version") < strripos($this->u_agent,$this->ub)){
$this->version= $matches['version'][0];
}
else {
$this->version= $matches['version'][1];
}
}
else {
$this->version= $matches['version'][0];
}

// check if we have a number
if ($version==null || $version=="") {
$version="?";
}

return array(
'userAgent' => $this->u_agent,
'name' => $this->bname,
'version' => $this->version,
'platform' => $this->platform,
'pattern' => $this->pattern
);
}

}
[/sourcecode]

Usage

[sourcecode language="php"]
$obj= new Browser();
$ua = $obj->getBrowser();
echo $ua['name']."<br>";
echo $ua['version']."<br>";
echo $ua['platform']."<br>";
echo $ua['userAgent']."<br>";
[/sourcecode]