Basic subnavigation loop.

Subnavigation Structure

<?
	/*
	Basic subnavigation loop. 
		-Draws 2 levels at a time
		-Ignores top level (never re-draws main navigation)
		-If page has children, draws page's siblings and subs
		-If no children, draws parent's and page's siblings.
	*/	

	$currentURL = BigTree::currentURL();
	$parent = $cms->getPage($page["parent"]);
	$top = ($parent["parent"] < 1) ? (($parent["id"] == 0) ? $page["id"] : $parent["id"]) : $parent["parent"];
	$subnav = $cms->getNavByParent($top, 2);
	
	if (!$is404) {
?>
<nav class="subnavigation">
	<? 
		foreach ($subnav as $item) { 
			$isActive = $currentURL == $item["link"];
			$isOpen = (strpos($currentURL, $item["link"]) > -1);
			$hasChildren = (count($item["children"]) > 0);
	?>
	<div class="item<? if ($isActive || $isOpen) echo ' active'; ?>">
		<a href="<?=$item["link"]?>" class="<? if ($isOpen) echo ' open'; ?><? if ($isActive) echo ' active'; ?><? if ($hasChildren && $isOpen) echo ' parent'; ?>"><?=$item["title"]?></a>
		<? if ($hasChildren && $isOpen) { ?>
		<div class="children">
			<? 
				foreach ($item["children"] as $child) { 
					$isActiveChild = (strpos($currentURL, $child["link"]) > -1);
			?>
			<a href="<?=$child["link"]?>" class="child<? if ($isActiveChild) echo ' active'; ?>"><?=$child["title"]?></a>
			<? 
				} 
			?>
		</div>
		<? } ?>
	</div>
	<? 
		} 
	?>
</nav>
<?
	}
?>