淘宝公布了他们的IP库http://ip.taobao.com/，还有REST API接口，不过每个用户的访问频率需小于10qps，访问方 式：http://ip.taobao.com/service/getIpInfo.php?ip=[ip地址字串]，返回内容以json格式的。具有IP查询，IP统计等功能。各大运营商拥有的IP数等信息。接下来介绍一下获取ip的实例：
/**
* 通过淘宝IP接口获取IP地理位置
* @param string $ip
* @return: string
**/
function getCity($ip)
{
$url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip;
$ipinfo=json_decode(file_get_contents($url));
if($ipinfo->code=='1'){
return false;
}
$city = $ipinfo->data->region.$ipinfo->data->city;
return $city;
}
header("Content-Type:text/html;charset=utf-8");
var_dump(getCity("112.234.69.189"));
?>
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