String i = "";

String d = "";

String ya = "";


String is = "";

String to="";

final Response.Listener<String> responseListener = new Response.Listener<String>() {

    @Override


    public void onResponse(String response)
    {JSONObject jsonResponse = null;

        try {

            JSONArray array = new JSONArray(response);

            jsonResponse = array.getJSONObject(0);

            Log.w(TAG, "onResponse: jsonresponse" + response.toString());

            boolean success = jsonResponse.getBoolean("success");

i = jsonResponse.getString("i");



                d = jsonResponse.getString("d");



            } else {

            }

        } catch (JSONException e) {
            e.printStackTrace();
        }}

    Inp insQ = new Inp(ya,is ,to ,responseListener);

    RequestQueue queue = Volley.newRequestQueue(main.this);

    queue.add(insQ);}


next ins class
public class Ins extends StringRequest {
    public static final String REGISTER_REQUEST_URL = "edu.php";

    private static final String TAG = "Ins";
    private Map<String,String> params;
    public Ins(String ya, String is, String to, Response.Listener listener)
    {
        super(Request.Method.POST, REGISTER_REQUEST_URL, listener, null);
        Log.w(TAG, "Ins: " + ya + is + to );
        params = new HashMap<>();
        params.put("ya", ya);
        params.put("is",is);
        params.put("to", to + "");


        Log.w(TAG, "Ins working well  " + ya + is +to );
    } @Override
    public Map<String,String> getParams() {

        return params;


    }
}

$servername = "localhost";
$username = "****";
$password = "*****";
$dbname="*****";


$em=$_POST['ya'];
$one=$_POST['is'];
$to = $_POST['to'];


$d = date('Y-m-d');
$y=date('y');
$m=date('m');
$d=date('d'); $conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
$sqll = "SELECT * FROM jio";
$res = mysqli_query($conn,$sqll);
$rowC = mysqli_num_rows($res);

$rowC = $rowC%999 + 1;
if($rowC < 10){
    $i = $year.$mon.$day.'00'.$rowC;
}elseif (rowC < 100) {
    $i = $year.$mon.$day.'0'.$rowC;
}else {
    $i = $year.$mon.$day.$rowC;
}
$sql = "INSERT INTO jio(iu,i, d, ya, is, qs,to,ra,wto,wi,wk,)VALUES('0',".$i."','".$d."','".$em."','".$one."', '-1','".$to."','0','0','0','0')";

$r = mysqli_query($conn, $sql);

$rows=mysqli_affected_rows($conn);


$result = array();

if($rows>0){
    array_push($result,array(
            'success'=>true,
            'i' => $i,
            'd' =>$d
    ));}
else
array_push($result,array(
        'success'=>false

));

echo json_encode($result);

mysqli_close($conn);
?>