API IN PHP

 <?php

header('Access-Control-Allow-Origin: *');

header('Access-Control-Allow-Methods: *');

header('Access-Control-Allow-Headers: *');

header("Content-Type: application/json; charset=UTF-8");

header("Access-Control-Max-Age: 3600");

include "conn.php";

$json = file_get_contents("php://input");

$obj= json_decode($json,true);

$method=$_SERVER['REQUEST_METHOD'];

$path=explode('/',$_SERVER['REQUEST_URI']);

switch ($method) {

    case 'GET' :

        if(isset($path[4]) && is_numeric($path[4]))

        {

            $result=mysqli_query($conn,"Select * from expence where ID='$path[4]'");

            if (mysqli_num_rows($result) > 0) {

                while($row = mysqli_fetch_assoc($result)) {

                  $data=json_encode($row);

                }

                echo $data;

            }

            else

            {

                echo json_encode("result not found.");

            }

        }

        else

        {

            $result=mysqli_query($conn,"Select * from expence");

        if (mysqli_num_rows($result) > 0) {

            while($row[] = mysqli_fetch_assoc($result)) {

              $data=json_encode($row);

            }

            echo $data;

        }

        else

        {

            echo json_encode("result not found.");

        }

        }

        break;

    case 'POST':

        $dE=$obj["DE"];

        $aMOUNT=$obj["AMOUNT"];

        $tYPE=$obj["TYPE"];

        $yEAR=$obj["YEAR"];

        $cDATE=$obj["CDATE"];

        $result=mysqli_query($conn,"INSERT INTO `expence`(`DE`, `AMOUNT`, `TYPE`, `YEAR`, `CDATE`) VALUES ('$dE','$aMOUNT','$tYPE','$yEAR','$cDATE')");

        if($result)

        {

            echo json_encode("Data Inserted successfully.");

        }

        else

        {

            echo json_encode("Something went wrong.");

        }

        break;

        case 'PUT':

            $iD=$obj["ID"];

            $dE=$obj["DE"];

            $aMOUNT=$obj["AMOUNT"];

            $tYPE=$obj["TYPE"];

            $yEAR=$obj["YEAR"];

            $cDATE=$obj["CDATE"];

            $result=mysqli_query($conn,"UPDATE `expence` SET `DE`='$dE',`AMOUNT`='$aMOUNT',`TYPE`='$tYPE',`YEAR`='$yEAR',`CDATE`='$cDATE'  WHERE ID='$iD'");

            if($result)

            {

                echo json_encode("Data Updated successfully.");

            }

            else

            {

                echo json_encode("Something went wrong.");

            }  

            break;

            case 'DELETE':

                $iD=$obj["ID"];

    $result=mysqli_query($conn,"delete from  expence where ID='$iD'");

    if($result)

    {

        echo json_encode("Data deleted successfully.");

    }

    else

    {

        echo json_encode("Something went wrong.");

    }

                break;

    default:

        echo 'Something went wrong.';

        break;

}

mysqli_close($conn);

?>