Listing and uploading files with the Google Drive API in PHP

Install the client

composer require google/apiclient

Authenticate

For server-to-server access, use a service account JSON key and grant it access to the target folder.

require 'vendor/autoload.php';
$client = new Google\Client();
$client->setAuthConfig('service-account.json');
$client->addScope(Google\Service\Drive::DRIVE);
$drive = new Google\Service\Drive($client);

List files

$files = $drive->files->listFiles([
  'pageSize' => 20,
  'fields'   => 'files(id, name, mimeType)'
]);
foreach ($files->getFiles() as $f) {
  echo $f->getName() . ' — ' . $f->getId() . PHP_EOL;
}

Upload a file

$meta = new Google\Service\Drive\DriveFile(['name' => 'report.pdf']);
$drive->files->create($meta, [
  'data'       => file_get_contents('report.pdf'),
  'mimeType'   => 'application/pdf',
  'uploadType' => 'multipart',
  'fields'     => 'id'
]);