require 'NestedSet.php'; $tree = new NestedSet(); $nodeId = 5; // ID of the node to regenerate $tree->regenerateEntireNtree($nodeId);In this example, we create a new instance of the `NestedSet` class, specifying the ID of the node we want to regenerate the tree for. We then call the `regenerateEntireNtree` method on the instance to rebuild the hierarchy. The `NestedSet` class is part of a package library for implementing nested set hierarchies in PHP applications. This library provides a range of tools and functions for building and modifying trees using the Nested Set model.