public function formatStats(Model\Stats $model)
{
$total = $this->formatArray(['numImages' => $model->getNumImages(), 'numUsers' => $model->getNumUsers(), 'numBytes' => $model->getNumBytes()]);
$custom = $this->formatArray($model->getCustomStats() ?: []);
return <<<STATS
<?xml version="1.0" encoding="UTF-8"?>
<imbo>
<stats>
{$total}
<custom>{$custom}</custom>
</stats>
</imbo>
STATS;
}