This library contains some useful methods in managing adjacency lists and nested set trees.

This library is still in beta. Most of the functionality works, but still needs improvement and benchmarking. You cannot modify your tree using this library. It's main usefulness at the moment is converting your trees from nested sets to adjacency lists and vice versa.

• PHP 5.3.0 or greater

• Create POPO (plain old PHP objects) from your database trees (adjacency list or nested set)
• Convert your nested set to an adjacency list and vice-versa
• Tighten up a nested set that may be "loose".
• Easily add a level property to your nested set if you don't have one already.
• toArray and fromArray methods to easily add and retrieve your tree

• An integrity checker to check the integrity of your tree. Mainly useful for nested sets (ex: left and right domains have gone bad).
• Add toNestedArray method which will return the tree as a nested array instead of a flat array.
• Add, move, delete node functionality. Need to experiment with this a bit to optimize speed.
• Add some unit testing

<?php

include 'vendor/autoload.php';

$sample = array(
    array(
        'id' => 1005,
        'left' => 7,
        'right' => 8
    ),
	array(
		'id' => 1001,
		'left' => 1,
		'right' => 12
	),
	array(
		'id' => 1002,
		'left' => 2,
		'right' => 9
	),
	array(
		'id' => 1003,
		'left' => 3,
		'right' => 4
	),
	array(
		'id' => 1004,
		'left' => 5,
		'right' => 6
	),
);

// Create a nested set from the sample data
$nested_set = Tree\NestedSet\NestedSet::fromArray($sample);

// The sample data contains some loose left and right domains, let's tighten it up
// NOTE: This method does not do the impossible. If your tree is corrupted, this method won't help.
$nested_set->tighten();

// You now have an adjacency list from your nested set
$adjacency_list = $nested_set->convert();

// You can do the same with your adjacency list and convert it to a nested set
$nested_set2 = $adjacency_list->convert();

// Let's see how our trees look back in array format
var_dump($adjacency_list->toArray());
var_dump($nested_set->toArray());

The MIT License (MIT)

Copyright (c) 2013 Vouga Labs

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