PHP使用淘宝接口获取IP地址的所在地区代码，接口非常快，返回的是json数据，直接解析成为数组。

$ip=171.217.104.247
$url = "http://ip.taobao.com/service/getIpInfo.php?ip=" . $ip;
$result = file_get_contents($url);
$row = json_decode($result, true);

返回的JSON返利

{"code":0,"data":{"country":"\u4e2d\u56fd","country_id":"CN","area":"\u897f\u5357","area_id":"500000","region":"\u56db\u5ddd\u7701","region_id":"510000","city":"\u6210\u90fd\u5e02","city_id":"510100","county":"","county_id":"-1","isp":"\u7535\u4fe1","isp_id":"100017","ip":"171.217.104.247"}}

解析成为的数组

{

    "code": 0,

    "data": {

        "country": "中国",

        "country_id": "CN",

        "area": "西南",

        "area_id": "500000",

        "region": "四川省",

        "region_id": "510000",

        "city": "成都市",

        "city_id": "510100",

        "county": "",

        "county_id": "-1",

        "isp": "电信",

        "isp_id": "100017",

        "ip": "171.217.104.247"

    }

}