获取用户IP地址与判断真实IP
function getIp() {
    if($_SERVER['HTTP_CLIENT_IP'])
    {
        return $_SERVER['HTTP_CLIENT_IP'];
    } elseif ($_SERVER['HTTP_X_FORWARDED_FOR']) {
        return $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        return $_SERVER['REMOTE_ADDR'];
    }
}

function get_real_ip()
{
        $ip=false;
        if(!empty($_SERVER["HTTP_CLIENT_IP"]))
        {
                $ip = $_SERVER["HTTP_CLIENT_IP"];
        }
        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
        {
                $ihttp://www.phprm.com = 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']);
}

教程网址:http://www.phprm.com/code/ip.html

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