Get OS & Browser name
<?php
$user_agent     =   $_SERVER['HTTP_USER_AGENT'];
function getOS() { 
global $user_agent;
$os_platform    =   "Unknown OS Platform";
$os_array       =   array(
    '/windows nt 10.0/i'    =>  'Windows 10',
    '/windows nt 6.2/i'     =>  'Windows 8',
    '/windows nt 6.1/i'     =>  'Windows 7',
    '/windows nt 6.0/i'     =>  'Windows Vista',
    '/windows nt 5.2/i'     =>  'Windows Server 2003/XP x64',
    '/windows nt 5.1/i'     =>  'Windows XP',
    '/windows xp/i'         =>  'Windows XP',
    '/windows nt 5.0/i'     =>  'Windows 2000',
    '/windows me/i'         =>  'Windows ME',
    '/win98/i'              =>  'Windows 98',
    '/win95/i'              =>  'Windows 95',
    '/win16/i'              =>  'Windows 3.11',
    '/macintosh|mac os x/i' =>  'Mac OS X',
    '/mac_powerpc/i'        =>  'Mac OS 9',
    '/linux/i'              =>  'Linux',
    '/ubuntu/i'             =>  'Ubuntu',
    '/iphone/i'             =>  'iPhone',
    '/ipod/i'               =>  'iPod',
    '/ipad/i'               =>  'iPad',
    '/android/i'            =>  'Android',
    '/blackberry/i'         =>  'BlackBerry',
    '/webos/i'              =>  'Mobile'
);
foreach ($os_array as $regex => $value) { 
if (preg_match($regex, $user_agent)) {
$os_platform    =   $value;
}
}   
return $os_platform;
}
function getBrowser() {
global $user_agent;
$browser        =   "Unknown Browser";
$browser_array  =   array(
    '/msie/i'       =>  'Internet Explorer',
    '/firefox/i'    =>  'Firefox',
    '/safari/i'     =>  'Safari',
    '/chrome/i'     =>  'Chrome',
    '/opera/i'      =>  'Opera',
    '/netscape/i'   =>  'Netscape',
    '/maxthon/i'    =>  'Maxthon',
    '/konqueror/i'  =>  'Konqueror',
    '/mobile/i'     =>  'Handheld Browser'
);
foreach ($browser_array as $regex => $value) { 
if (preg_match($regex, $user_agent)) {
$browser    =   $value;
}
}
return $browser;
}
$user_os        =   getOS();
$user_browser   =   getBrowser();
$device_details =   "<strong>Browser: </strong>".$user_browser."<br /><strong>Operating System: </strong>".$user_os."";
print_r($device_details);
echo("<br /><br /><br />".$_SERVER['HTTP_USER_AGENT']."");
?>
