免费IP归属地查询接口和通过ip获取大致位置信息

1 淘宝API接口：

文档：http://ip.taobao.com/instructions

示例：  

GET http://ip.taobao.com/outGetIpInfo?ip=221.218.209.125&accessKey=alibaba-inc

{
    data: {
        area: "",
        country: "中国",
        isp_id: "100026",
        queryIp: "221.218.209.125",
        city: "北京",
        ip: "221.218.209.125",
        isp: "联通",
        county: "",
        region_id: "110000",
        area_id: "",
        county_id: null,
        region: "北京",
        country_id: "CN",
        city_id: "110100"
    },
    msg: "query success",
    code: 0
}

2 IP-API接口：

文档：https://ip-api.com/docs/api:json

示例：

GET http://ip-api.com/json/221.218.209.125?lang=zh-CN

{
    status: "success",
    country: "中国",
    countryCode: "CN",
    region: "BJ",
    regionName: "北京市",
    city: "北京",
    zip: "",
    lat: 39.9285,
    lon: 116.385,
    timezone: "Asia/Shanghai",
    isp: "China Unicom Beijing Province Network",
    org: "",
    as: "AS4808 China Unicom Beijing Province Network",
    query: "221.218.209.125"
}

3 太平洋IP接口：

文档：http://whois.pconline.com.cn/

示例：

GET http://whois.pconline.com.cn/ipJson.jsp?ip=221.218.209.125&json=true

{
    ip: "221.218.209.125",
    pro: "北京市",
    proCode: "110000",
    city: "北京市",
    cityCode: "110000",
    region: "海淀区",
    regionCode: "110108",
    addr: "北京市海淀区 联通ADSL",
    regionNames: "",
    err: ""
}

4 IP-API接口的整合案例

// 根据IP地址获取城市信息
protected function getCity($ip)
{
    $url = "http://ip-api.com/json/".$ip."?lang=zh-CN";
    $data = file_get_contents($url);
    $data = json_decode($data, true);
    if (!empty($data['status']) && $data['status'] == 'success') {
        // 国家-省份-城市-经度,纬度
        return $data['country'].'-'.$data['regionName'].'-'.$data['city'].'-'.$data['lon'].','.$data['lat'];
    }
    return '获取城市信息失败';
}