PHP : How to detect browser and operating system (os) with php

<?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
$obj->showInfo(‘browser’);

// get browser version
$obj->showInfo(‘version’);

// get Operating system
$getOs = $obj->showInfo(‘os’);

// get all information and it returns an array

?>

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