WolfCMS Layout - Conditional navigation

 "Wolf" Layout code extract
<!-- THIS CONDITIONAL NAVIGATION COULD GO INTO A SNIPPET / START -->
<?php if ($this->level() > 0) { $parent = reset(explode('/', CURRENT_URI)); $topPage = $this->find($parent); } ?>
<?php if(isset($topPage) && $topPage != '' && $topPage != null) : ?>

<?php if ($this->level() > 0) : ?>
<?php if (count($topPage->children()) > 0 && $topPage->slug() != 'articles') : ?>
<h2><?php echo $topPage->title(); ?> Menu</h2>
<ul>
<?php foreach ($topPage->children() as $subPage): ?>
    <li><?php echo $subPage->link($subPage->title, (url_start_with($subPage->url) ? ' class="current"': null)); ?></li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<?php endif; ?>
<?php endif; ?>
<!-- CONDITIONAL NAVIGATION / END -->