问org.json.JSONException:状态没有值

EN

public void performSearch() {
            String url= "http://192.168.0.136/fyp/stitle1.php";
            RequestQueue requestQueue = Volley.newRequestQueue(Stitle.this);
           JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.POST,url,null,
                   new Response.Listener<JSONObject>() {
               @Override
               public void onResponse(JSONObject response) {
                   Log.d("Response", response.toString());
                   try {
                       //converting the string to json array object
                       JSONObject array = new JSONObject();
                       //Log.i("test", " value : " + array.getString("status"));
                       Log.i("test", " value : " + response.getString("status"));
                       if (array.getString("status").equals("true")) {
                           JSONArray jsonArray = array.getJSONArray("search");
                           Log.i("test", " value : " + array);

                           for (int i = 0; i < jsonArray.length(); i++) {

                               //getting product object from json array
                               JSONObject product = jsonArray.getJSONObject(i);

                               //adding the product to product list
                               boolean add = productList.add(new list(
                                       product.getLong("isbn"),
                                       product.getString("title"),
                                       product.getString("authors"),
                                       product.getInt("accession"),
                                       product.getString("publisher"),
                                       product.getInt("pubyear"),
                                       product.getInt("pages"),
                                       product.getInt("rak"),
                                       product.getInt("hr"),
                                       product.getInt("vr"),
                                       product.getLong("barcode")

                               ));

                           }

                       } else {
                           Log.i("test", "else error");

                       }


                   } catch (JSONException e) {
                       e.printStackTrace();
                       Log.i("test", e.toString());
                   }
               }

           }, new Response.ErrorListener() {
               @Override
               public void onErrorResponse(VolleyError error) {
                   Toast.makeText(getApplicationContext(), "error:" + error.toString(), Toast.LENGTH_LONG).show();

               }
           }) {
               @Override
               protected Map<String, String> getParams() throws AuthFailureError {

                   Map<String, String> params = new HashMap<>();
                   params.put("Title", searchtitle.getText().toString());

                   return params;
               }
           };
           requestQueue = Volley.newRequestQueue(Stitle.this);
           requestQueue.add(jsObjRequest);

        }

<?php

 // array for JSON response
   $response = array();
  //set values just in case any thing goes wrong
  $response["status"] = 0;
 $response["message"] = "Error before start";

// check for post data with isset
 if (isset($_POST["Title"])) {

$title = $_POST["Title"];

// You were not using PDO so I dumped your connection and require you to provide...
//...a configuration file for ...
require_once 'connection.php';
// ...these  variables
$host = 'localhost';
$db   = 'fyp';
$user = 'root';
$pass = '';
$charset = 'utf8';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$opt = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];

try{
    // connecting to db with PDO
    $pdo = new PDO($dsn, $user, $pass, $opt);


    $sql = 'SELECT isbn, title, authors, accession, publisher, pubyear, pages, rak, hr, vr, barcode
            FROM books 
            WHERE title LIKE :titleParam';

    $titleParam = "%".$title."%";

    $stmt = $pdo->prepare($sql);

    // Bind the parameter
    $stmt->bindParam(':titleParam', $titleParam, PDO::PARAM_STR);

    $res = $stmt->execute();

    if ($res) {
        // success
        $response["status"] = 1;
        // connection node
        $response["books"] = array();

        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
            $data = array();
            $data["isbn"] = $row["isbn"];
            $data["title"] = $row["title"];
            $data["authors"] = $row["authors"];
            $data["accession"] = $row["accession"];
            $data["publisher"] = $row["publisher"];
            $data["pubyear"] = $row["pubyear"];
            $data["pages"] = $row["pages"];
            $data["rak"] = $row["rak"];
            $data["hr"] = $row["hr"];
            $data["vr"] = $row["vr"];
            $data["barcode"] = $row["barcode"];

            array_push($response["books"], $data);
        }
    }
    else {
        // required field is missing
        $response["status"] = 2;
        $response["message"] = "No data returned";
    }   
}
catch (Exception $e){
    $response["status"] = 3;
    $response["message"] = "Error occurred." . $e->getMessage();
    }
  }
   else {
      $response["status"] = 4;
        $response["message"] = "Post parameters are not correct";
    }
      // echoing JSON response
      echo json_encode($response);
    ?>