PHP Get User Browser, IP, Browser, Search keyword

<?php

// RESULTS

// {
// Name: "DESKTOP-OD5QHSG",
// Browser: "Google Chrome",
// BrowserVer: "56.0.2924.87",
// OpSystem: "windows",
// BrowserAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36",
// BrowserLang: "tr",
// IP: "::1",
// Type: "search",
// Domain: "google.com.tr",
// Keyword: "sunu aradim"
// }


function getBrowser()
{
    $u_agent = $_SERVER['HTTP_USER_AGENT'];
    $bname = 'Unknown';
    $platform = 'Unknown';
    $version= "";

    //First get the platform?
    if (preg_match('/linux/i', $u_agent)) {
        $platform = 'linux';
    }
    elseif (preg_match('/macintosh|mac os x/i', $u_agent)) {
        $platform = 'mac';
    }
    elseif (preg_match('/windows|win32/i', $u_agent)) {
        $platform = 'windows';
    }

    // Next get the name of the useragent yes seperately and for good reason
    if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent))
    {
        $bname = 'Internet Explorer';
        $ub = "MSIE";
    }
    elseif(preg_match('/Firefox/i',$u_agent))
    {
        $bname = 'Mozilla Firefox';
        $ub = "Firefox";
    }
    elseif(preg_match('/Chrome/i',$u_agent))
    {
        $bname = 'Google Chrome';
        $ub = "Chrome";
    }
    elseif(preg_match('/Safari/i',$u_agent))
    {
        $bname = 'Apple Safari';
        $ub = "Safari";
    }
    elseif(preg_match('/Opera/i',$u_agent))
    {
        $bname = 'Opera';
        $ub = "Opera";
    }
    elseif(preg_match('/Netscape/i',$u_agent))
    {
        $bname = 'Netscape';
        $ub = "Netscape";
    }

    // finally get the correct version number
    $known = array('Version', $ub, 'other');
    $pattern = '#(?<browser>' . join('|', $known) .
    ')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
    if (!preg_match_all($pattern, $u_agent, $matches)) {
        // we have no matching number just continue
    }

    // see how many we have
    $i = count($matches['browser']);
    if ($i != 1) {
        //we will have two since we are not using 'other' argument yet
        //see if version is before or after the name
        if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
            $version= $matches['version'][0];
        }
        else {
            $version= $matches['version'][1];
        }
    }
    else {
        $version= $matches['version'][0];
    }

    // check if we have a number
    if ($version==null || $version=="") {$version="?";}

    return array(
        'userAgent' => $u_agent,
        'name'      => $bname,
        'version'   => $version,
        'platform'  => $platform,
        'pattern'    => $pattern
    );
}

function getUserIP()
{
    $client  = @$_SERVER['HTTP_CLIENT_IP'];
    $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
    $remote  = $_SERVER['REMOTE_ADDR'];

    if(filter_var($client, FILTER_VALIDATE_IP))
    {
        $ip = $client;
    }
    elseif(filter_var($forward, FILTER_VALIDATE_IP))
    {
        $ip = $forward;
    }
    else
    {
        $ip = $remote;
    }

    return $ip;
}

// **************************************************

$Browser=getBrowser();

$RefInfo = Array();
$referrer = 'https://www.google.com.tr/?gws_rd=ssl#q=şunu%20aradım';
$referrer = str_replace("#","&",$referrer);
$ref = parse_url($referrer);
if(isset($ref['host'])){
$refdomain = $ref['host'];
$refdomain = str_replace("www.","",$refdomain);
$parsed = parse_url( $referrer, PHP_URL_QUERY );

parse_str( $parsed, $query );

if(isset($query['q'])){
    $keyword = $query['q'];
}elseif(isset($query['p'])){
    $keyword = $query['p'];
}elseif(isset($query['text'])){
    $keyword = $query['text'];
}


if(isset($keyword)){
    $RefInfo['Name'] = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    $RefInfo['Browser'] = $Browser['name'];
    $RefInfo['BrowserVer'] = $Browser['version'];
    $RefInfo['OpSystem'] = $Browser['platform'];
    $RefInfo['BrowserAgent'] = $_SERVER['HTTP_USER_AGENT'];
    $RefInfo['BrowserLang'] = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
    $RefInfo['IP'] = getUserIP();
    $RefInfo['Type'] = "search";
    $RefInfo['Domain'] = $refdomain;
    $RefInfo['Keyword'] = $keyword;

}else{
    $RefInfo['Name'] = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    $RefInfo['Browser'] = $Browser['name'];
    $RefInfo['BrowserVer'] = $Browser['version'];
    $RefInfo['OpSystem'] = $Browser['platform'];
    $RefInfo['BrowserAgent'] = $_SERVER['HTTP_USER_AGENT'];
    $RefInfo['BrowserLang'] = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
    $RefInfo['IP'] = getUserIP();
    $RefInfo['Type'] = "referral";
    $RefInfo['Domain'] = $refdomain;
    $RefInfo['Keyword'] = "";
}

}else{
    $RefInfo['Name'] = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    $RefInfo['Browser'] = $Browser['name'];
    $RefInfo['BrowserVer'] = $Browser['version'];
    $RefInfo['OpSystem'] = $Browser['platform'];
    $RefInfo['BrowserAgent'] = $_SERVER['HTTP_USER_AGENT'];
    $RefInfo['BrowserLang'] = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
    $RefInfo['IP'] = getUserIP();
    $RefInfo['Type'] = "direct";
    $RefInfo['Domain'] = "";
    $RefInfo['Keyword'] = '';
}

echo json_encode($RefInfo);

?>