How does Zend_Navigation_Container implement RecursiveIterator, and why is it relevant to navigating through pages in PHP?

Zend_Navigation_Container implements RecursiveIterator by defining methods like getChildren() and hasChildren() to allow iteration over nested navigation structures. This is relevant to navigating through pages in PHP because it enables developers to traverse complex navigation hierarchies easily, making it simple to build menus, breadcrumbs, and other navigation elements dynamically.

// Example code snippet demonstrating how Zend_Navigation_Container implements RecursiveIterator

class MyNavigation extends Zend_Navigation_Container implements RecursiveIterator
{
    public function getChildren()
    {
        return $this->pages;
    }

    public function hasChildren()
    {
        return count($this->pages) > 0;
    }

    // Implement other RecursiveIterator methods as needed
}