protected function getOffsetAndLimit($page = null) : array
{
$per_page = (int) $this->config('blog.per_page') ?? 20;
$page = (int) (!empty($page) ? $page : $_GET['page'] ?? 0);
if ($page < 1) {
$page = 1;
}
return [($page - 1) * $per_page, $per_page];
}