gozap_api/Admin/Refer/index.php

<?php
include_once "../../include/DB.php";

$SwapReferID="";
$TotalReferdSwapCount=0;
$UsedReferdSwapCount=0;
$AvailableReferdSwapCount=0;

if (isset($_POST["SwapReferID"]) && !empty($_POST["SwapReferID"])) {
    $SwapReferID=$_POST["SwapReferID"];
}
if (isset($_POST["TotalReferdSwapCount"]) && !empty($_POST["TotalReferdSwapCount"])) {
    $TotalReferdSwapCount=$_POST["TotalReferdSwapCount"];
}
if (isset($_POST["UsedReferdSwapCount"]) && !empty($_POST["UsedReferdSwapCount"])) {
    $UsedReferdSwapCount=$_POST["UsedReferdSwapCount"];
}
if (isset($_POST["AvailableReferdSwapCount"]) && !empty($_POST["AvailableReferdSwapCount"])) {
    $AvailableReferdSwapCount=$_POST["AvailableReferdSwapCount"];
}

$SwapRechargeUpdateSql = "UPDATE swaprefer SET TotalFreeSwapCount='$TotalReferdSwapCount',UsedSwapCount='$UsedReferdSwapCount',AvailableSwapCount='$AvailableReferdSwapCount' WHERE SwapReferID='$SwapReferID'";

$SwapRechargeUpdateResult = $conn->query($SwapRechargeUpdateSql);
if ($SwapRechargeUpdateResult === TRUE) {
    $value = array(
        "SwapReferID"=>(int)$SwapReferID,
        "TotalReferdSwapCount"=>(int)$TotalReferdSwapCount,
        "UsedReferdSwapCount"=>(int)$UsedReferdSwapCount,
        "AvailableReferdSwapCount"=>(int)$AvailableReferdSwapCount,
        "Message"=>"Swap refer data saved successfully",
      );
      // Use json_encode() function
      $json = json_encode($value);
}else {
    http_response_code(404);
    $errorMesage= $conn->error;
    // Declare an array with error message 
    $value = array(
      "Message"=>"Something went wrong",
      "Error"=>$errorMesage
    );
    // Use json_encode() function
    $json = json_encode($value);
}
// Display the output
echo ($json);
$conn->close();