function getRealIpAddr()    {        if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))        {            $ip=$_SERVER['HTTP_CLIENT_IP'];        }        elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))        //to check ip is pass from proxy        {            $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];        }        else        {            $ip=$_SERVER['REMOTE_ADDR'];        }        return $ip;    }

用法：

<?php  $ip = getRealIpAddr();  echo $ip;  ?>