Sorted Collections for PHP >= 8.1

tree, iterator, map, set, collection, ordered, sorted, treeset, treemap, avl


PHP Sorted Collections

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Sorted Collection for PHP. Insertion, search, and removal compute in log(n) time where n is the number of items present in the collection. It uses AVL threaded tree [see @Knuth97, 1:320, Sect. 2.3.1] as internal structure.

@Knuth97: Donald E. Knuth, The Art of Computer Programming, Addison-Wesley, volumes 1 and 2, 2nd edition, 1997.

This project uses:

## Instructions

Using composer: either

$ composer create-project chdemko/sorted-collections:1.0.*@dev; cd sorted-collections
Creating a "chdemko/sorted-collections:1.0.*@dev" project at "./sorted-collections"

or create a composer.json file containing

    "require": {
        "chdemko/sorted-collections": "1.0.*@dev"

and run

$ composer install
Loading composer repositories with package information

Create a test.php file containg


require __DIR__ . '/vendor/autoload.php';

use chdemko\SortedCollection\TreeMap;

$tree = TreeMap::create()->put(
    [1=>1, 9=>9, 5=>5, 2=>2, 6=>6, 3=>3, 0=>0, 8=>8, 7=>7, 4=>4]
echo $tree . PHP_EOL;

And run

$ php test.php

See the examples and benchmarks folders for more information.



$ sudo apt install doxygen python3-pip python3-virtualenv
$ virtualenv venv
$ venv/bin/activate
(venv) $ pip install -r docs/requirements.txt
(venv) $ sphinx-build -b html docs/ html/
(venv) $ deactivate

if you want to create local documentation with Sphinx.


If you are using this project including publication in research activities, you have to cite it using (BibTeX format). You are also pleased to send me an email to

All releases can be found here