<form method="POST">
    <h3>Editing: NodeFinder.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);

namespace PhpParser;

use PhpParser\NodeVisitor\FindingVisitor;
use PhpParser\NodeVisitor\FirstFindingVisitor;

class NodeFinder {
    /**
     * Find all nodes satisfying a filter callback.
     *
     * @param Node|Node[] $nodes Single node or array of nodes to search in
     * @param callable $filter Filter callback: function(Node $node) : bool
     *
     * @return Node[] Found nodes satisfying the filter callback
     */
    public function find($nodes, callable $filter): array {
        if ($nodes === []) {
            return [];
        }

        if (!is_array($nodes)) {
            $nodes = [$nodes];
        }

        $visitor = new FindingVisitor($filter);

        $traverser = new NodeTraverser($visitor);
        $traverser-&gt;traverse($nodes);

        return $visitor-&gt;getFoundNodes();
    }

    /**
     * Find all nodes that are instances of a certain class.

     * @template TNode as Node
     *
     * @param Node|Node[] $nodes Single node or array of nodes to search in
     * @param class-string&lt;TNode&gt; $class Class name
     *
     * @return TNode[] Found nodes (all instances of $class)
     */
    public function findInstanceOf($nodes, string $class): array {
        return $this-&gt;find($nodes, function ($node) use ($class) {
            return $node instanceof $class;
        });
    }

    /**
     * Find first node satisfying a filter callback.
     *
     * @param Node|Node[] $nodes Single node or array of nodes to search in
     * @param callable $filter Filter callback: function(Node $node) : bool
     *
     * @return null|Node Found node (or null if none found)
     */
    public function findFirst($nodes, callable $filter): ?Node {
        if ($nodes === []) {
            return null;
        }

        if (!is_array($nodes)) {
            $nodes = [$nodes];
        }

        $visitor = new FirstFindingVisitor($filter);

        $traverser = new NodeTraverser($visitor);
        $traverser-&gt;traverse($nodes);

        return $visitor-&gt;getFoundNode();
    }

    /**
     * Find first node that is an instance of a certain class.
     *
     * @template TNode as Node
     *
     * @param Node|Node[] $nodes Single node or array of nodes to search in
     * @param class-string&lt;TNode&gt; $class Class name
     *
     * @return null|TNode Found node, which is an instance of $class (or null if none found)
     */
    public function findFirstInstanceOf($nodes, string $class): ?Node {
        return $this-&gt;findFirst($nodes, function ($node) use ($class) {
            return $node instanceof $class;
        });
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>