Get OS and Browser

browserdetection.php

/**
 * Get the OS from the HTTP_USER_AGENT string
 * 
 * * @link http://stackoverflow.com/questions/18070154/get-operating-system-info-with-php
 * 
 * @return string
 */
function getOS()
{
    $user_agent = (isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : 'NA');

    $os_platform    =   "NA";

    $os_array       =   array(
        '/windows nt 6.3/i'     =>  'Windows 8.1',
        '/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;
}

/**
 * Get the browser from the HTTP_USER_AGENT string
 * 
 * @link http://stackoverflow.com/questions/18070154/get-operating-system-info-with-php
 * 
 * @return string
 */
function getBrowser()
{
    $user_agent = $user_agent = (isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : 'NA');

    $browser        =   "NA";

    $browser_array  =   array(
        '/msie|trident/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;
}