---
title: Moonwalk::moonwalk
---
Moonwalk::moonwalk — Output generator for walking up the DOM tree
## Description ##
public Moonwalk::moonwalk ( \Closure|null $filter = null ) : \Generator
Non-standard. Creates a [`\Generator`](https://www.php.net/manual/en/class.generator.php) object for walking up the DOM tree. This is in lieu of recreating the awful [DOM TreeWalker API](https://developer.mozilla.org/en-US/docs/Web/API/Treewalker).
## Examples ##
**Example \#1 Print name of all ancestors of the H1 element**
```php
loadHTML('Ook!Eek
');
$h1 = $dom->getElementsByTagName('h1')->item(0);
// All ancestors will be elements so there's no reason to have a filter.
$tree = $h1->moonwalk();
foreach ($tree as $t) {
echo "{$t->nodeName}\n";
}
?>
```
The above example will output something similar to:
```php
body
html
```