tree.php

<?php

declare(strict_types=1);

namespace App;

use drupol\launcher\Launcher;
use loophp\phptree\Builder\Random;
use loophp\phptree\Exporter\Gv;
use loophp\phptree\Exporter\Image;
use loophp\phptree\Exporter\Text;
use loophp\phptree\Node\AttributeNode;
use loophp\phptree\Node\ValueNode;
use loophp\phptree\Tree\Tree;

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

function randomColor(): string {
    return array_reduce(
        array('r', 'g', 'b'),
        static function(string $carry, string $type): string {
            $dechex = dechex(mt_rand(0, 255));

            return $carry . (strlen($dechex) < 2  ? '0' : '') . $dechex;
        },
        '#'
    );
}

$tree = new ValueNode('root', 2);

$nodes = [];
foreach (range('A', 'Z') as $v) {
    $nodes[] = new AttributeNode(['label' => $v, 'style' => 'filled', 'color'=>randomColor(), 'fillcolor'=>randomColor()], 2);
}

$tree->add(...$nodes);

$textExporter = new Text();
$textExporter->export($tree); // [root[A[C[G[O][P]][H[Q][R]]][D[I[S][T]][J[U][V]]]][B[E[K[W][X]][L[Y][Z]]][F[M][N]]]]⏎

$graphvizExporter = new Gv();
$dotScript = $graphvizExporter->export($tree);
file_put_contents('tree.dot', $dotScript);

$imageExporter = new Image();
$imageContent = $imageExporter->setFormat('png')->export($tree);
file_put_contents('tree.png', $imageContent);

Launcher::open('tree.png');