php 通过淘宝API接口查询客户端地址

<?php   
/*
通过淘宝API接口查询客户端地址
调用淘宝的API接口http://ip.taobao.com/service/getIpInfo.php?ip=ip地址
*/
$ip=get_ip_data();

function get_ip_data(){   
    $ip=file_get_contents("http://ip.taobao.com/service/getIpInfo.php?ip=".get_client_ip());
    $ip = json_decode($ip);
    if($ip->code){
        return false;
    }
    $data = (array) $ip->data;
    return $data;
}

//取客户端 ip
function get_client_ip()
{
    if (isset($_SERVER['HTTP_CLIENT_IP']) and !empty($_SERVER['HTTP_CLIENT_IP']))
    {
        return $_SERVER['HTTP_CLIENT_IP'];
    }
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) and !empty($_SERVER['HTTP_X_FORWARDED_FOR']))
    {
        return strtok($_SERVER['HTTP_X_FORWARDED_FOR'], ',');
    }
    if (isset($_SERVER['HTTP_PROXY_USER']) and !empty($_SERVER['HTTP_PROXY_USER']))
    {
        return $_SERVER['HTTP_PROXY_USER'];
    }
    if (isset($_SERVER['REMOTE_ADDR']) and !empty($_SERVER['REMOTE_ADDR']))
    {
        return $_SERVER['REMOTE_ADDR'];
    }
    else
    {
        return "0.0.0.0";
    }
}
?>
//该片段来自于http://outofmemory.cn