Compare iOS app version with latest version from server

gistfile1.aw

<?php
  $request_body = @file_get_contents('php://input');
  $request_data = json_decode($request_body, true);
  $bundle_version = $_GET['bundleVersion'];
  $latest_version = "1.0.1";

  if (version_compare($bundle_version, $latest_version, '<')) {
    $result = array(
      'needsUpdate' => TRUE,
      'latestVersion' => $latest_version
    );
  }
  else {
    $result = array(
      'needsUpdate' => FALSE,
      'latestVersion' => $latest_version
    );
  }
  header('Content-Type: application/download');
  exit  (json_encode($result));