PHP get visitor information

<?php
header('Content-Type: text/html; charset=utf-8');

//Get the visitor's information
class visitorInfo
{
    //get the visitor ip
    public function getIp()
    {
        $ip=false;
        if(!empty($_SERVER["HTTP_CLIENT_IP"])){
            $ip = $_SERVER["HTTP_CLIENT_IP"];
        }
        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);
            if ($ip) { array_unshift($ips, $ip); $ip = FALSE; }
            for ($i = 0; $i < count($ips); $i++) {
                if (!eregi ("^(10│172.16│192.168).", $ips[$i])) {
                    $ip = $ips[$i];
                    break;
                }
            }
        }
        return ($ip ? $ip : $_SERVER['REMOTE_ADDR']);
    }
 
    //Get the city, network operator and other information according to ip
    public function findCityByIp($ip){
        $data = file_get_contents('http://ip.taobao.com/service/getIpInfo.php?ip='.$ip);
        return json_decode($data,$assoc=true);
    }
 
   //Get the user's browser type
    public function getBrowser(){
        $agent=$_SERVER["HTTP_USER_AGENT"];
        if(strpos($agent,'MSIE')!==false || strpos($agent,'rv:11.0'))
            return "ie";
        else if(strpos($agent,'Firefox')!==false)
            return "firefox";
        else if(strpos($agent,'Chrome')!==false)
            return "chrome";
        else if(strpos($agent,'Opera')!==false)
            return 'opera';
        else if((strpos($agent,'Chrome')==false)&&strpos($agent,'Safari')!==false)
            return 'safari';
        else
            return 'unknown';
    }
 
    //Get the source of the website
    public function getFromPage(){
        if(isset($_SERVER['HTTP_REFERER']))
            return $_SERVER['HTTP_REFERER'];
        else if(strpos($_SERVER['QUERY_STRING'], '?'))
            return 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
        else
            return 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    }
}

$v = new visitorInfo();
echo $v -> getIp(),PHP_EOL;
var_dump($v->findCityByIp('101.201.174.210'));
echo $v->getBrowser(),PHP_EOL;
echo $v->getFromPage(),PHP_EOL;
Effect picture:
PHP get visitor information

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