# betterdocs/3.8.9/includes/Dependencies/PhpParser/NodeVisitor.php

BetterDocs – AI Documentation, Knowledge Base, MCP Server, Docs, Wikis, FAQ & Chatbot, version 3.8.9. 72 lines.

- Page: https://pluginprobe.com/plugins/betterdocs/3.8.9/code/includes/Dependencies/PhpParser/NodeVisitor.php
- Raw: https://pluginprobe.com/plugins/betterdocs/3.8.9/raw/includes/Dependencies/PhpParser/NodeVisitor.php
- Modified: 2023-08-14T08:41:14+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/betterdocs/3.8.9/code/includes/Dependencies/PhpParser/NodeVisitor.php#L10-L20`.

```php
<?php

namespace WPDeveloper\BetterDocs\Dependencies\PhpParser;

interface NodeVisitor
{
    /**
     * Called once before traversal.
     *
     * Return value semantics:
     *  * null:      $nodes stays as-is
     *  * otherwise: $nodes is set to the return value
     *
     * @param Node[] $nodes Array of nodes
     *
     * @return null|Node[] Array of nodes
     */
    public function beforeTraverse(array $nodes);

    /**
     * Called when entering a node.
     *
     * Return value semantics:
     *  * null
     *        => $node stays as-is
     *  * NodeTraverser::DONT_TRAVERSE_CHILDREN
     *        => Children of $node are not traversed. $node stays as-is
     *  * NodeTraverser::STOP_TRAVERSAL
     *        => Traversal is aborted. $node stays as-is
     *  * otherwise
     *        => $node is set to the return value
     *
     * @param Node $node Node
     *
     * @return null|int|Node Node
     */
    public function enterNode(Node $node);

    /**
     * Called when leaving a node.
     *
     * Return value semantics:
     *  * null
     *        => $node stays as-is
     *  * NodeTraverser::REMOVE_NODE
     *        => $node is removed from the parent array
     *  * NodeTraverser::STOP_TRAVERSAL
     *        => Traversal is aborted. $node stays as-is
     *  * array (of Nodes)
     *        => The return value is merged into the parent array (at the position of the $node)
     *  * otherwise
     *        => $node is set to the return value
     *
     * @param Node $node Node
     *
     * @return null|false|int|Node|Node[] Node
     */
    public function leaveNode(Node $node);

    /**
     * Called once after traversal.
     *
     * Return value semantics:
     *  * null:      $nodes stays as-is
     *  * otherwise: $nodes is set to the return value
     *
     * @param Node[] $nodes Array of nodes
     *
     * @return null|Node[] Array of nodes
     */
    public function afterTraverse(array $nodes);
}
```