setAuthConfig($credentials_file);
} elseif (getenv('GOOGLE_APPLICATION_CREDENTIALS')) {
// use the application default credentials
$client->useApplicationDefaultCredentials();
} else {
echo missingServiceAccountDetailsWarning();
return;
}
$client->setApplicationName("Client_Library_Examples");
$client->setScopes(['https://www.googleapis.com/auth/books']);
$service = new Google_Service_Books($client);
/************************************************
We're just going to make the same call as in the
simple query as an example.
************************************************/
$optParams = array('filter' => 'free-ebooks');
$results = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
?>
Results Of Call: