PHP development tips: Get the city based on the IP address

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We still use this method quite a lot to facilitate the collection of information for data mining analysis. This method not only obtains the current city based on the IP address, but also obtains the user's city location based on the HTTP request.

Implementation method: Mainly obtain it based on the Amap API. First register as an Amap user, then authenticate as a developer, create an application and obtain the key for calling. The specific implementation method is as follows:

<?php

/**
 * =======================================
 * Created by ZHIHUA·WEI.
 * Author: ZHIHUA·WEI
 * Date: 2018/4/12
 * Time: 16:13
 * Project: PHP开发小技巧
 * Power: 根据ip地址获取城市
 * =======================================
 */

/**
 * 根据HTTP请求获取用户位置
 */
function get_user_location()
{
    $key = "4a218d0d82c3a74acf019b701e8c0ccc"; // 高德地图key
    $url = "http://restapi.amap.com/v3/ip?key=$key";
    $json = file_get_contents($url);
    $obj = json_decode($json, true); // 转换数组
    $obj["message"] = $obj["status"] == 0 ? "失败" : "成功";
    return $obj;
}

/**
 * 根据 ip 获取 当前城市
 */
function get_city_by_ip()
{
    if (!empty($_SERVER["HTTP_CLIENT_IP"])) {
        $cip = $_SERVER["HTTP_CLIENT_IP"];
    } elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
    } elseif (!empty($_SERVER["REMOTE_ADDR"])) {
        $cip = $_SERVER["REMOTE_ADDR"];
    } else {
        $cip = "";
    }
    $url = &#39;https://restapi.amap.com/v3/ip&#39;;
    $data = array(
        &#39;output&#39; => &#39;json&#39;,
        &#39;key&#39; => &#39;4a218d0d82c3a74acf019b701e8c0ccc&#39;,
        &#39;ip&#39; => $cip
    );

    $postdata = http_build_query($data);
    $opts = array(
        &#39;http&#39; => array(
            &#39;method&#39; => &#39;POST&#39;,
            &#39;header&#39; => &#39;Content-type: application/x-www-form-urlencoded&#39;,
            &#39;content&#39; => $postdata
        )
    );

    $context = stream_context_create($opts);

    $result = file_get_contents($url, false, $context);
    if (!empty($result)) {
        $res = json_decode($result, true);
        if (!empty($res)) {

            if (count($res[&#39;province&#39;]) == 0) {
                $res[&#39;province&#39;] = &#39;北京市&#39;;
            }
            if (!empty($res[&#39;province&#39;]) && $res[&#39;province&#39;] == "局域网") {
                $res[&#39;province&#39;] = &#39;北京市&#39;;
            }
            if (count($res[&#39;city&#39;]) == 0) {
                $res[&#39;city&#39;] = &#39;北京市&#39;;
            }
        } else {
            $res[&#39;province&#39;] = &#39;北京市&#39;;
            $res[&#39;city&#39;] = &#39;北京市&#39;;
        }

        return $res;
    } else {
        return array(
            "province" => &#39;北京市&#39;,
            "city" => &#39;北京市&#39;
        );
    }
}

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