Hi Reader's,
Welcome to FindNerd, today we are going to discuss how to find OS version from web browsers using PHP ?
If you want to get the OS version which you are using. Then you can use the library code below:-

 <?php
   //here craete a array of OS list and store in a variable
    $operating_system = array
    (
    // Match user agent string with operating systems
    'Windows 3.11' => 'Win16',
    'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)',
    'Windows 98' => '(Windows 98)|(Win98)',
    'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
    'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
    'Windows Server 2003' => '(Windows NT 5.2)',
    'Windows Vista' => '(Windows NT 6.0)',
    'Windows 7' => '(Windows NT 7.0)',
    'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
    'Windows ME' => 'Windows ME',
    'Open BSD' => 'OpenBSD',
    'Sun OS' => 'SunOS',
    'Linux' => '(Linux)|(X11)',
    'Mac OS' => '(Mac_PowerPC)|(Macintosh)',
    'QNX' => 'QNX',
    'BeOS' => 'BeOS',
    'OS/2' => 'OS/2',
    'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves/Teoma)|(ia_archiver)'
    );
    // use foreach loop
    foreach($operating_system as $Current_OS=>$Os_match)
    {
    // check a match
    if (eregi($Os_match, $_SERVER['HTTP_USER_AGENT']))
    {
    // get the correct match
    break;
    }
    }
    // print your current OS version
    echo "Hi user you are using ".$Current_OS;
    ?>

The output of the code above will be:

Hi user you are using Linux