Receiving only Null from PHP API

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1

Hi developer group! I am trying to get the PHP API up and running, however I only receive the word NULL when accessing the php file in browser.

Here is my code where ‘MY_TOKEN’ is my security token.

<?php
$token = 'MY_TOKEN';
$apiUrl = 'https://api.monday.com/v2';
$headers = ['Content-Type: application/json', 'Authorization: ' . $token];
$query = '
{
    boards(ids: 3598566708) {
      groups(ids: "new_group") {
        items {
         id
          name
          column_values {
            title
            text
          }
        }
      }
    }
  }
';


$data = @file_get_contents($apiUrl, false, stream_context_create([
    'http' => [
     'method' => 'POST',
     'header' => $headers,
     'content' => json_encode(['query' => $query]),
    ]
   ]));
   $responseContent = json_decode($data, true);
   
   echo json_encode($responseContent);
   
?>