Wolf CMS - list untagged pages

<?php
/**
 * Creates an array with all pages, sub-pages and their respective levels.
 * It can be used to format the list of pages differently in various views.
 *
 * @param string $parent_id - The id of the parent page.
 * @param int $level - The level where to start.
 * @return array  The array with all the page objects, with an extra 'level' attribute, informing the page's level.
*/
    function wfx_getAllChildren($parent_id=0, $level=0) { // begin method
        $children_array = array();
        if(Page::hasChildren($parent_id)) {
            $pages = Page::childrenOf($parent_id);
            foreach($pages as $child) {
                $child->level = $level;
                $children_array[] = $child;
                $children_array = array_merge($children_array, wfx_getAllChildren($child->id, $level+1));
            }
        }
        return $children_array;
    } // End method
?>

<p>Pages without tags:</p>

<ul>
  <li>Page link [edit link]</li>
<?php
  $allKids = wfx_getAllChildren('1'); // use page ID for where to start "all-children" listing
  foreach ($allKids as $kid) :
?>
<?php if (count($kid->tags()) == 0) : ?>
  <li><?php echo Page::linkById((int)$kid->id()); ?> <?php if (AuthUser::isLoggedIn() && AuthUser::hasPermission('administrator')) : ?>[<a href="<?php echo BASE_URL.'admin/page/edit/'.$kid->id(); ?>">edit</a>]<?php endif; ?></li>
<?php endif; ?>
<?php endforeach; ?>
</ul>