Count result from dbquery_tree().
tree_count( array $data [, string $column_name, string $value_to_match ] ) : int
$data (array) (Required) Results from dbquery_tree().
$column_name (string) (Optional) Default value: null
$value_to_match (string) (Optional) Default value: null
(int)
$data = dbquery_tree(DB_NEWS_CATS, 'news_cat_id', 'news_cat_parent');
$tree_count = tree_count($data);
// 1