add.php

<?php
//미들서버 등록 코드 파일.
    require_once __DIR__ . '/path_ip_class.php';

    $ip_url_settings = Settings::getInstance('php.ini');
    $ip_setting = $ip_url_settings->ip;

    header("Access-Control-Allow-Origin: '$ip_setting'"); //CORS 에러 잡기.
    header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
    header("Content-Type: application/json");

    $db_host = "localhost";
    $db_user = "root";
    $db_passwd = "619412";
    $db_name = "water_middle_server";
    $conn = mysqli_connect($db_host, $db_user, $db_passwd, $db_name) or die("Connected Failed!!!!");
    # Get JSON as a string
    $json_str = file_get_contents('php://input');
    # Get as an object
    $json_obj = json_decode($json_str);

    $ap_code = $json_obj->{"ap_code"};
    $public_ip = $json_obj->{"public_ip"};

    $query = "INSERT INTO SYS_INFO (AP_CODE, PUBLIC_IP ) VALUES ( $ap_code, '$public_ip')";
    $result = mysqli_query($conn, $query) or die ('Error database.');
    $key = ['result' => 'OK'];

    echo json_encode($key);

    mysqli_close($conn);
?>