php实现获取访客信息的实例分析

<?php  
header('Content-Type: text/html; charset=utf-8');  
  
//获取访客的信息  
class visitorInfo  
{  
    //获取访客ip  
    public function getIp()  
    {  
        $ip=false;  
        if(!emptyempty($_SERVER["HTTP_CLIENT_IP"])){  
            $ip = $_SERVER["HTTP_CLIENT_IP"];  
        }  
        if (!emptyempty($_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']);  
    }  
   
    //根据ip获取城市、网络运营商等信息  
    public function findCityByIp($ip){  
        $data = file_get_contents('http://ip.taobao.com/service/getIpInfo.php?ip='.$ip);  
        return json_decode($data,$assoc=true);  
    }  
   
   //获取用户浏览器类型  
    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';  
    }  
   
    //获取网站来源  
    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;