调用新浪IP库地址

最近写一个访问统计功能，用的是新浪ip库地址。下面是代码片段

 

<?php 

header("Content-type: text/html; charset=utf-8");
/**
 * 获得用户的真实IP地址
 *
 * @return  string
 */
function real_ip()
{
    static $realip = NULL;

    if ($realip !== NULL)
    {
        return $realip;
    }

    if (isset($_SERVER))
    {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
        {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

            /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
            foreach ($arr AS $ip)
            {
                $ip = trim($ip);

                if ($ip != 'unknown')
                {
                    $realip = $ip;

                    break;
                }
            }
        }
        elseif (isset($_SERVER['HTTP_CLIENT_IP']))
        {
            $realip = $_SERVER['HTTP_CLIENT_IP'];
        }
        else
        {
            if (isset($_SERVER['REMOTE_ADDR']))
            {
                $realip = $_SERVER['REMOTE_ADDR'];
            }
            else
            {
                $realip = '0.0.0.0';
            }
        }
    }
    else
    {
        if (getenv('HTTP_X_FORWARDED_FOR'))
        {
            $realip = getenv('HTTP_X_FORWARDED_FOR');
        }
        elseif (getenv('HTTP_CLIENT_IP'))
        {
            $realip = getenv('HTTP_CLIENT_IP');
        }
        else
        {
            $realip = getenv('REMOTE_ADDR');
        }
    }

    preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
    $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

    return $realip;
}

function sinaIPApi(){
    $ip = real_ip();

    if($ip == "0.0.0.0"){
        return false;
    }
    //获取新浪IP库查询地址，并写入页面
    $ip    =    file_get_contents("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip={$ip}");
    $ip = json_decode($ip);
　　//如果页面用的不是utf-8 那么需要用 urldecode 函数解码
    if(empty($ip)){
        return false;
    }
        return $ip;
}

var_dump(sinaIPApi());