gozap_api/Admin/Service/add_service.php

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

$AssetID="";

if (isset($_POST["AssetID"]) && !empty($_POST["AssetID"])) {
   $AssetID=$_POST["AssetID"];
}

$ServiceCheckSQL = "SELECT * FROM servicehistory servicehistory WHERE servicehistory.AssetID='$AssetID' AND servicehistory.isServiced='0'";

$ServiceCheckResult = $conn->query($ServiceCheckSQL);
if ($ServiceCheckResult!== false && $ServiceCheckResult->num_rows > 0) {

    while($ServiceCheckRow = $ServiceCheckResult->fetch_assoc()) {
        $ServiceHistoryID = $ServiceCheckRow["ServiceHistoryID"];
        $ServiceUpdateSQL = "UPDATE servicehistory servicehistory SET servicehistory.InWard='$currentDateTime',isServiced='1' WHERE servicehistory.ServiceHistoryID='$ServiceHistoryID'";
        $ServiceUpdateResult = $conn->query($ServiceUpdateSQL);
        if ($ServiceUpdateResult === TRUE) {
            $value = array(
                "Message"=>"Service updated 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);
        }
    }
    
}else {

    $ServiceInsertSQL = "INSERT INTO servicehistory(AssetID) VALUES ('$AssetID')";
    $ServiceInsertResult = $conn->query($ServiceInsertSQL);
    if ($ServiceInsertResult === TRUE) {
        $value = array(
            "Message"=>"Service insert 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();