---
title: Walk::walk
---
Walk::walk — Output generator for walking down the DOM tree
## Description ##
public Walk::walk ( \Closure|null $filter = null ) : \Generator
Non-standard. Creates a [`\Generator`](https://www.php.net/manual/en/class.generator.php) object for walking down 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 every Element**
```php
loadHTML('Ook!Eek
');
$tree = $dom->walk(function($node) {
return ($node instanceof Element);
});
foreach ($tree as $t) {
echo "{$t->nodeName}\n";
}
?>
```
The above example will output something similar to:
```php
html
head
title
body
h1
```