ProcessWire Build tree for navigation

PW2 tree.php

<?php
define("n","\n");
define("br","<br />");
function buildTopMenu($pages, &$depth, $selector='', $maxDepth=2) {
	global $active;
	$out = '';
	if($depth <= $maxDepth && $pages->getTotal() > 0) {
		$depth++;
		$out .= "<ul class='depth-{$depth}'>".n;
		foreach($pages as $p) {
			$css = '';
			if($active == $p->id) {$css = ' class="active"';}

			$out .= "<li{$css}><a href='{$p->url}' data-id='{$p->id}'>{$p->title}</a>".n;
				$out .= buildTopMenu( $p->children($selector), $depth, $selector, $maxDepth );
			$out .= "</li>".n;
		}
		$depth--;
		$out .= "</ul>".n;
	}
	return $out;
}
?>