# give/4.16.9/src/Framework/FieldsAPI/Concerns/WalkNodes.php

GiveWP – Donation Plugin and Fundraising Platform, version 4.16.9. 51 lines.

- Page: https://pluginprobe.com/plugins/give/4.16.9/code/src/Framework/FieldsAPI/Concerns/WalkNodes.php
- Raw: https://pluginprobe.com/plugins/give/4.16.9/raw/src/Framework/FieldsAPI/Concerns/WalkNodes.php
- Modified: 2021-11-23T23:55:18+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/give/4.16.9/code/src/Framework/FieldsAPI/Concerns/WalkNodes.php#L10-L20`.

```php
<?php

namespace Give\Framework\FieldsAPI\Concerns;

use Give\Framework\FieldsAPI\Contracts\Collection;

/**
 * A declarative iterator for each Node in the tree.
 */
trait WalkNodes
{

    /**
     * @param callable $callback
     *
     * @return void
     */
    public function walk(callable $callback)
    {
        $this->walkCollection($this, $callback);
    }

    /**
     * @param Collection $collection
     * @param callable   $callback
     *
     * @return void
     */
    public function walkCollection(Collection $collection, callable $callback)
    {
        foreach ($collection->all() as $node) {
            $callback($node);
            if ($node instanceof Collection) {
                $this->walkCollection($node, $callback);
            }
        }
    }

    /**
     * @param callable $callback
     *
     * @return void
     */
    public function walkFields(callable $callback)
    {
        foreach ($this->getFields() as $field) {
            $callback($field);
        }
    }
}

```