Gmail List API returning all messages when maxResults set to 100

Question

I am working on getting the Gmail List API setup, but for some reason, it returns all 5,000 messages in my inbox even though I have set maxResults to 100. Here is my current code:

$pageToken = NULL; 
$messages = array();
$opt_param = array();
do {
    try {
        if ($pageToken) {
            $opt_param['pageToken'] = $pageToken;
            $opt_param['maxResults'] = 100;
            $opt_param['labelIds'] = 'INBOX';
        }
        $messagesResponse = $service->users_messages->listUsersMessages($userId, $opt_param);
        if ($messagesResponse->getMessages()) {
            $messages = array_merge($messages, $messagesResponse->getMessages());
            $pageToken = $messagesResponse->getNextPageToken();
        }
    } catch (Exception $e) {
        print 'An error occurred: ' . $e->getMessage();
    }
} while ($pageToken);

foreach ($messages as $message) {
    print 'Message with ID: ' . $message->getId() . '<br/>';
}
return $messages;

I'm not sure where I am going wrong, but I need to be able to filter down my inbox to the last 100 messages sent.

Answer 1

So I just realized, you are getting all messages because even though you are getting them by slices of 100, you are, in the end, doing that in a loop until you get all messages in your inbox...

If you only want the first 100, try this instead:

$messages = array();
try {
  $opt_param = array(
    'maxResults' => 100,
    'labelIds' => 'INBOX'
  );
  $messagesResponse = $service->users_messages->listUsersMessages($userId, $opt_param);
  $messages = $messagesResponse->getMessages();
} catch (Exception $e) {
  print 'An error occurred: ' . $e->getMessage();
}
if(!empty($messages)) {
  foreach ($messages as $message) {
    print 'Message with ID: ' . $message->getId() . '<br/>';
  }
}

return $messages;

So I removed the do/while loop, basically...

Hope this helps!