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Code:

<?php
/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

include_once __DIR__ . '/../vendor/autoload.php';
include_once "templates/base.php";

echo pageHeader("File Download - Downloading a large file");

/*************************************************
 * Ensure you've downloaded your oauth credentials
 ************************************************/
if (!$oauth_credentials = getOAuthCredentialsFile()) {
  echo missingOAuth2CredentialsWarning();
  return;
}

/************************************************
 * The redirect URI is to the current page, e.g:
 * http://localhost:8080/large-file-download.php
 ************************************************/
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];

$client = new Google\Client();
$client->setAuthConfig($oauth_credentials);
$client->setRedirectUri($redirect_uri);
$client->addScope("https://www.googleapis.com/auth/drive");
$service = new Google_Service_Drive($client);

/************************************************
 * If we have a code back from the OAuth 2.0 flow,
 * we need to exchange that with the
 * Google\Client::fetchAccessTokenWithAuthCode()
 * function. We store the resultant access token
 * bundle in the session, and redirect to ourself.
 ************************************************/
if (isset($_GET['code'])) {
  $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
  $client->setAccessToken($token);

  // store in the session also
  $_SESSION['upload_token'] = $token;

  // redirect back to the example
  header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}

// set the access token as part of the client
if (!empty($_SESSION['upload_token'])) {
  $client->setAccessToken($_SESSION['upload_token']);
  if ($client->isAccessTokenExpired()) {
    unset($_SESSION['upload_token']);
  }
} else {
  $authUrl = $client->createAuthUrl();
}

/************************************************
 * If we're signed in then lets try to download our
 * file.
 ************************************************/
if ($client->getAccessToken()) {
  // Check for "Big File" and include the file ID and size
  $files = $service->files->listFiles([
    'q' => "name='Big File'",
    'fields' => 'files(id,size)'
  ]);

  if (count($files) == 0) {
    echo "
      <h3 class='warn'>
        Before you can use this sample, you need to
        <a href='/large-file-upload.php'>upload a large file to Drive</a>.
      </h3>";
    return;
  }

  // If this is a POST, download the file
  if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Determine the file's size and ID
    $fileId = $files[0]->id;
    $fileSize = intval($files[0]->size);

    // Get the authorized Guzzle HTTP client
    $http = $client->authorize();

    // Open a file for writing
    $fp = fopen('Big File (downloaded)', 'w');

    // Download in 1 MB chunks
    $chunkSizeBytes = 1 * 1024 * 1024;
    $chunkStart = 0;

    // Iterate over each chunk and write it to our file
    while ($chunkStart < $fileSize) {
      $chunkEnd = $chunkStart + $chunkSizeBytes;
      $response = $http->request(
        'GET',
        sprintf('/drive/v3/files/%s', $fileId),
        [
          'query' => ['alt' => 'media'],
          'headers' => [
            'Range' => sprintf('bytes=%s-%s', $chunkStart, $chunkEnd)
          ]
        ]
      );
      $chunkStart = $chunkEnd + 1;
      fwrite($fp, $response->getBody()->getContents());
    }
    // close the file pointer
    fclose($fp);

    // redirect back to this example
    header('Location: ' . filter_var($redirect_uri . '?downloaded', FILTER_SANITIZE_URL));
  }
}
?>

<div class="box">
<?php if (isset($authUrl)): ?>
  <div class="request">
    <a class='login' href='<?= $authUrl ?>'>Connect Me!</a>
  </div>
<?php elseif(isset($_GET['downloaded'])): ?>
  <div class="shortened">
    <p>Your call was successful! Check your filesystem for the file:</p>
    <p><code><?= __DIR__ . DIRECTORY_SEPARATOR ?>Big File (downloaded)</code></p>
  </div>
<?php else: ?>
  <form method="POST">
    <input type="submit" value="Click here to download a large (20MB) test file" />
  </form>
<?php endif ?>
</div>

<?= pageFooter(__FILE__) ?>