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The Hoa\Heap library.

dev-master / 0.x-dev 2017-11-06 12:46 UTC

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Last update: 2021-09-20 08:31:04 UTC



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Hoa is a modular, extensible and structured set of PHP libraries. Moreover, Hoa aims at being a bridge between industrial and research worlds.


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This library provides a set of advanced Heap can support Scalar, Array, Object or Closure as item and not only Integer, as ordinal does. The order of heap depends of priority parameter.

Hoa\Heap\Min and Hoa\Heap\Max class interpret priority by comparing items numerically. But you are free to implement your own class if you want a different sort algorithm.

⚠️ Warning

The default iteration process do not dequeue the Heap as common usage. You must use Generator methods top or pop for iterate on with remove item from heap.


With Composer, to include this library into your dependencies, you need to require hoa/heap:

$ composer require hoa/heap '~0.0'

For more installation procedures, please read the Source page.


Considering the library has been installed with Composer, the following commands will run the test suites:

$ composer install
$ vendor/bin/hoa test:run

For more information, please consult the contributor guide.

Quick usage

As a quick overview, we propose to see a simple use case with a Phone number, This phone number must be sent to three methods in a strict order, Check, Transform, Format.

Let's assume we don't have access to iteration process. But we can sort in which orders our methods must be called for respect our process.

Register Callback

In first, we will create our callbacks process.

require_once dirname(dirname(__DIR__)) . '/vendor/autoload.php';

// First method used to check if phone number is correct.
$check = function($phone) {
    if (1 !== preg_match('/^\+?[0-9]+$/', $phone)) {
        throw new \Exception('Phone number not conform.');

    return $phone;

// Second method used to convert number into object.
$transform = function($phone) {
    return (object)[
        'prefix'  => '+33',
        'country' => 'France',
        'number'  => $phone,

// Third method used to display formatted number.
$format = function(\StdClass $phone) {
    return $phone->prefix
        . ' '
        . wordwrap($phone->number, 3, ' ', true)

Create and fill Heap

Creation of our Heap with minimum priority Ascending ( lower called first ).

$heap = new \Hoa\Heap\Min();

// Insert the callback method with the priority argument used for order Heap.
$heap->insert($transform, 20);
$heap->insert($check, 10);
$heap->insert($format, 30);

// Show the number of item in Heap.

 * Will output:
 *     int(3)

Iteration Heap

Then we can iterate on our Heap with assurance of correct call order. Spread your number into closure and have process mutation expected.

// Phone number as expected by first callback.
$number = '123001234';

foreach ($heap as $closure) {
    try {
        // Mutation of number by closure, execute in the priority order expected.
        $number = $closure($number);
    } catch (\Exception $e) {

// Finally, we can display our formatted number.

 * Will output:
 *     string(15) "+33 123 001 234"


The hack book of Hoa\heap contains detailed information about how to use this library and how it works.

To generate the documentation locally, execute the following commands:

$ composer require --dev hoa/devtools
$ vendor/bin/hoa devtools:documentation --open

More documentation can be found on the project's website: hoa-project.net.

Getting help

There are mainly two ways to get help:


Do you want to contribute? Thanks! A detailed contributor guide explains everything you need to know.


Hoa is under the New BSD License (BSD-3-Clause). Please, see LICENSE for details.

Related projects

There are no related project registered, Let us know by opening issue if you use it and want be listed!