无法从PHP获得正确的回复到android

Question

I am creating an app for which I have to maintain a table(login registration), for connecting my android app to the table I am using PHP.

Android code

     try {
             JSONObject jsonResponse = new JSONObject(response);
              boolean success = jsonResponse.getBoolean("success");
              if (success) {
             Intent intent = new Intent(RegisterActivity.this, Login.class);
          RegisterActivity.this.startActivity(intent);
      } else if(!success)
         {   JSONObject jsonResponse2 = new JSONObject(response);
           String errval = new String();
         errval=jsonResponse2.getString("errval");
       AlertDialog.Builder builder = new AlertDialog.Builder(RegisterActivity.this);
         builder.setMessage(errval)
         .setNegativeButton("retry", null)
            .create()
            .show();
     }
  } catch (JSONException e) {
     e.printStackTrace();
   Toast.makeText(getApplicationContext(), "Error submitting registration", Toast.LENGTH_SHORT).show();
                    }


  PHP code:-
  require 'config.php';
  $file = 'outfile.txt';
   if ($_POST) {
file_put_contents($file,"~~~~~~~~~~~~~~~~~~~~
");
foreach ($_POST as $KEY => $VAL) {
    file_put_contents($file,$KEY."=>".$VAL."
", FILE_APPEND);
            }
if (@$_POST["Email_id"] and @$_POST["hash"]) {
    $email = strtolower($_POST["Email_id"]);
    $username = strtolower($_POST["Username"]);
    $hash = $_POST["hash"];
    $echk = $my->Execute("select count(*) from users where email = '$email'");
    if ($echk->fields[0] == 0) {
        $uchk = $my->Execute("select count(*) from users where user = '$username'");
        if ($uchk->fields[0] == 0) {
            $ins = $my->Execute("insert into users values (default,'$username','$email','$hash',default)");
            $error["success"] = true;
            $error["errval"] = "success";
            file_put_contents($file,"success", FILE_APPEND);
        } else {
            $error["success"] = false;
            $error["errval"] = "User: $username already exists";
        }
    } else {
        $error["success"] = false;
        $error["errval"] = "Email: $email already exists";
    }
    } else {
    $error["errval"] = "Missing a key: 'Email_id' or 'hash'";
   }
  file_put_contents($file,"~~~~~~~~~~~~~~~~~~~~
", FILE_APPEND);
  $json = json_encode($error);
      print_r($json);
 }
       ?>

The details are being entered in the DB without any issues every time, the code also shows if the email is aldready existing in the table, but if the registration is a success, the app throws exception Error submitting registration. cant figure out where the problem is thank you. PS. I am new to stackoverflow still learning, forgive if there are any mistakes in post

Answer 1

if (@$echk->fields[0] == 0) {
        $uchk = $my->Execute("select count(*) from users where user = '$username'");
        if (@$uchk->fields[0] == 0) {
            $ins = $my->Execute("insert into users values (default,'$username','$email','$hash',default)");
            $error["success"] = true;
            $error["errval"] = "success";
            file_put_contents($file,"success", FILE_APPEND);
forgot @ in if condition