Get Browser and Operating System Information with PHP

Long time ago I needed to get browser information with PHP and I wrote a class which uses the preg_match_all function with regular expressions to get information from the browser. This class will return information from browser in an array format including the browser name, browser version, and also the operating system name.  It helped me so I shared to help others. 

Here is the complete code:

<?PHP
class OS_BR{

    private $agent = "";
    private $info = array();

    function __construct(){
        $this->agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : NULL;
        $this->getBrowser();
        $this->getOS();
    }

    function getBrowser(){
        $browser = array("Navigator"            => "/Navigator(.*)/i",
                         "Firefox"              => "/Firefox(.*)/i",
                         "Internet Explorer"    => "/MSIE(.*)/i",
                         "Google Chrome"        => "/chrome(.*)/i",
                         "MAXTHON"              => "/MAXTHON(.*)/i",
                         "Opera"                => "/Opera(.*)/i",
                         );
        foreach($browser as $key => $value){
            if(preg_match($value, $this->agent)){
                $this->info = array_merge($this->info,array("Browser" => $key));
                $this->info = array_merge($this->info,array(
                  "Version" => $this->getVersion($key, $value, $this->agent)));
                break;
            }else{
                $this->info = array_merge($this->info,array("Browser" => "UnKnown"));
                $this->info = array_merge($this->info,array("Version" => "UnKnown"));
            }
        }
        return $this->info['Browser'];
    }

    function getOS(){
        $OS = array("Windows"   =>   "/Windows/i",
                    "Linux"     =>   "/Linux/i",
                    "Unix"      =>   "/Unix/i",
                    "Mac"       =>   "/Mac/i"
                    );

        foreach($OS as $key => $value){
            if(preg_match($value, $this->agent)){
                $this->info = array_merge($this->info,array("Operating System" => $key));
                break;
            }
        }
        return $this->info['Operating System'];
    }

    function getVersion($browser, $search, $string){
        $browser = $this->info['Browser'];
        $version = "";
        $browser = strtolower($browser);
        preg_match_all($search,$string,$match);
        switch($browser){
            case "firefox": $version = str_replace("/","",$match[1][0]);
            break;

            case "internet explorer": $version = substr($match[1][0],0,4);
            break;

            case "opera": $version = str_replace("/","",substr($match[1][0],0,5));
            break;

            case "navigator": $version = substr($match[1][0],1,7);
            break;

            case "maxthon": $version = str_replace(")","",$match[1][0]);
            break;

            case "google chrome": $version = substr($match[1][0],1,10);
        }
        return $version;
    }

    function showInfo($switch){
        $switch = strtolower($switch);
        switch($switch){
            case "browser": return $this->info['Browser'];
            break;

            case "os": return $this->info['Operating System'];
            break;

            case "version": return $this->info['Version'];
            break;

            case "all" : return array($this->info["Version"], 
              $this->info['Operating System'], $this->info['Browser']);
            break;

            default: return "Unkonw";
            break;

        }
    }
}

// using
// create an new instant of OS_BR class
$obj = new OS_BR();
// // if you want to show one by one information then try showInfo() function

// get browser
echo $obj->showInfo('browser');

// get browser version
echo $obj->showInfo('version');

// get Operating system
echo $obj->showInfo('os');

// get all information and it returns an array
echo "<pre>".print_r($obj->showInfo("all"),true)."</pre>";
?>

It is useful for getting browser name, browser version and operating system name. 

Any comments or suggestion would be appreciated.

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