stackoverflow explanation of question 11111170

<?php

# http://stackoverflow.com/questions/11111170/the-concept-of-an-object-variable-in-typoscript

class Menu {
  public $pid;

  function render() {
    // code to render the menu
  }
}

$page = new Page();
$menu = new Menu();

$menu->pid = 2345;
$page->add($menu); // adds a list of subpages from 2345 to the page

$menu->pid = 3456;
$page->add($menu);

echo $page->display();