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

namespace PhpParser\NodeVisitor;

use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;

/**
 * This visitor can be used to find and collect all nodes satisfying some criterion determined by
 * a filter callback.
 */
class FindingVisitor extends NodeVisitorAbstract {
    /** @var callable Filter callback */
    protected $filterCallback;
    /** @var Node[] Found nodes */
    protected array $foundNodes;

    public function __construct(callable $filterCallback) {
        $this-&gt;filterCallback = $filterCallback;
    }

    /**
     * Get found nodes satisfying the filter callback.
     *
     * Nodes are returned in pre-order.
     *
     * @return Node[] Found nodes
     */
    public function getFoundNodes(): array {
        return $this-&gt;foundNodes;
    }

    public function beforeTraverse(array $nodes): ?array {
        $this-&gt;foundNodes = [];

        return null;
    }

    public function enterNode(Node $node) {
        $filterCallback = $this-&gt;filterCallback;
        if ($filterCallback($node)) {
            $this-&gt;foundNodes[] = $node;
        }

        return null;
    }
}
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