Composer dependency tree with PHPTree

composer.php

<?php

declare(strict_types=1);

use drupol\launcher\Launcher;
use drupol\phptree\Exporter\Image;
use drupol\phptree\Importer\SimpleArray;

include './vendor/autoload.php';

// Get the graph dependency as JSON.
$jsonArray = json_decode(
    shell_exec('composer show --tree -f json'),
    true
);

// Build the root node.
$nodes = getNodeFromPackage(['name' => 'Root package']);

// Build the children recursively.
$nodes['children'] = array_map(
    static function (array $package): array {
        return getNodeFromPackage($package);
        },
    $jsonArray['installed']
);

// Import the array into a tree.
$tree = (new SimpleArray())->import($nodes);

// Display the full tree.
Launcher::open((new Image())->setFormat('png')->export($tree));

// Display the tree under the 7th dependency (phpspec/phpspec)
Launcher::open((new Image())->setFormat('png')->export($tree[7]));

function getChildrenOf(array $package): array
{
    $package += ['requires' => []];

    return array_map(
      static function (array $package): array {
          return getNodeFromPackage($package);
      },
      $package['requires']
    );
}

function getNodeFromPackage(array $package): array
{
    return array_filter([
        'value' => $package['name'],
        'children' => getChildrenOf($package),
    ]);
}

Here's the resulting tree:

And here's the dependency graph of phpspec/phpspec.