source: branches/1.1dev/docs/navigation_heirarchy_array_test.php

<?php
// Page heirarchy experiment.
// Looking for the ideal array.
$heir = array(
    'id'    => '1',
    'title' => 'Home',
    'url'   => '/index.php',
    array(
        'id'    => '2',
        'title' => 'Products',
        'url'   => '/products/',
        array(
            'id'    => '4',
            'title' => 'Plastic Bags',
            'url'   => '/products/plastic_bags.php'
        ),
        array(
            'id'    => '5',
            'title' => 'Paper Bags',
            'url'   => '/products/paper_bags.php'
        ),
        array(
            'id'    => '6',
            'title' => 'Vomit Bags',
            'url'   => '/products/vomit_bags.php'
        )
    ),
    array(
        'id'    => '3',
        'title' => 'Services',
        'url'   => '/services/',
        array(
            'id'    => '7',
            'title' => 'Bag cleaning',
            'url'   => '/services/cleaning.php'
        ),
        array(
            'id'    => '8',
            'title' => 'Bag disposal',
            'url'   => '/services/disposal.php'
        )
    )
);
function printHeir($node, $parent=0, $n=0)
{
    if (is_array($node) && !empty($node)) {
        echo str_repeat('&nbsp;&nbsp;&nbsp;&nbsp;', $n) . $node['title'] . ' => ' . $node['url'] . ' (' . $parent . ',' . $node['id'] . ') ' . '<br />';
        foreach ($node as $key=>$val) {
            if (is_array($val) && !empty($val)) {
                printHeir($val, $node['id'], $n+1);
            }
        }
    }
}

?><pre><h1>Formatted array data:</h1><?php
printHeir($heir);
?><br /><br /><h1>Raw array data:</h1><?php
print_r($heir);
?></pre>