'{username}', 'apiKey' => '{apiKey}', )); // 2. Obtain an Object Store service object from the client. $objectStoreService = $client->objectStoreService(null, '{region}'); // 3. Get container. $container = $objectStoreService->getContainer('{containerName}'); // 4. Get the space (in bytes) used by this container. /** @var $bytesUsed int */ $bytesUsed = $container->getBytesUsed();