use Google\Cloud\Storage\StorageClient;

$storage = new StorageClient();
$bucketsIterator = $storage->buckets([
    'maxResults' => 5 // The number of results per page
    'resultLimit' => 10 // The number of results returned in total **new**
    'pageToken' => null // Set this to the value of a previously retrieved token to resume iterating from a specific point **new**
]);

// Iterate by each item (bucket) in the project
foreach ($bucketsIterator as $bucket) {
    var_dump($bucket->name());
}

// Or iterate by page
$bucketsPageIterator = $bucketsIterator->iterateByPage();

foreach ($bucketsPageIterator as $page) {
    foreach ($page as $bucket) {
        var_dump($bucket->name());
    }
}

// Get the next result token
$nextToken = $bucketsIterator->nextResultToken();