$apiKey = "<YOUR_API_KEY>";
// Change to your API key.
// Warn if the API key isn't changed!
if ($apiKey == '<YOUR_API_KEY>') {
echo missingApiKeyWarning();
} else {
$client->setDeveloperKey($apiKey);
$service = new Postman_Google_Service_Books($client);
/************************************************
To actually make the batch call we need to
enable batching on the client - this will apply
globally until we set it to false. This causes
call to the service methods to return the query
rather than immediately executing.
************************************************/
$client->setUseBatch(true);
/************************************************
We then create a batch, and add each query we
want to execute with keys of our choice - these
keys will be reflected in the returned array.
************************************************/
$batch = new Postman_Google_Http_Batch($client);
$optParams = array('filter' => 'free-ebooks');
$req1 = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
$batch->add($req1, "thoreau");
$req2 = $service->volumes->listVolumes('George Bernard Shaw', $optParams);
$batch->add($req2, "shaw");
/************************************************
Executing the batch will send all requests off
at once.
************************************************/
