invisio v2.0

<?php
include('../../../config/main_function.php');
$secure = "cAh3DrJACzw4RbU";
$connection = connectDB($secure);

$district_id = mysqli_real_escape_string($connection, $_POST['district_id']);

$arr = [];
$province = "";
$amphoe = "";
$sql = "SELECT * FROM tbl_district WHERE district_id = '$district_id';";
$rs = mysqli_query($connection, $sql);
$row = mysqli_fetch_array($rs);
$ref_amphoe = $row['ref_amphoe'];
if ($row) {

$sql_amp = "SELECT * FROM tbl_amphoe WHERE amphoe_id ='$ref_amphoe'";
    $res_amp = mysqli_query($connection, $sql_amp);
    $row_amp = mysqli_fetch_assoc($res_amp);
    $amphoe = $row_amp['amphoe_name_th'];

if ($row_amp) {

$amphoe = $row_amp['amphoe_name_th'];

$sql_province = "SELECT * FROM tbl_province WHERE province_id  = '" . $row_amp['ref_province'] . "';";
        $rs_province = mysqli_query($connection, $sql_province);
        $row_province = mysqli_fetch_array($rs_province);
        if ($row_province) {
            $province = $row_province['province_name_th'];
        }
    }

$arr['status'] = 200;
    $arr['message'] = "พบข้อมูล";
    $arr['data'] = [
        'amphoe' => $amphoe,
        'province' => $province,
    ];
} else {
    $arr['status'] = 500;
    $arr['message'] = "เลข ปณ ไม่ถูกต้อง กรุณาตรวจสอบอีกครั้ง";
    $arr['data'] = [
        'amphoe' => "กรุณากรอกรหัส ปณ.",
        'province' => "กรุณากรอกรหัส ปณ.",
        'district' => "กรุณากรอกรหัส ปณ.",
    ];
}

echo json_encode($arr);