Page root parent
Get the lowest-level, non-homepage parent of this page
The rootParents typically comprise the first level of navigation on a site, and in many cases are considered the "section" pages of the site.
Example
// Determine if we are in the "products" section of the site
if($page->rootParent()->template == 'products') {
// we are in the products section
} else {
// we are in some other section of the site
}
Usage
$page = $page->rootParent();