directory_nested_listing.php

<?php

use React\EventLoop\Loop;
use React\Filesystem\Factory;
use React\Filesystem\Node\DirectoryInterface;
use React\Filesystem\Node\NodeInterface;

require 'vendor/autoload.php';

$filesystem = Factory::create();

$ls = static function (string $dir) use (&$ls, $filesystem): void {
    $filesystem->detect($dir)->then(function (DirectoryInterface $directory) {
        return $directory->ls();
    })->then(static function (array $nodes) use (&$ls) {
        foreach ($nodes as $node) {
            assert($node instanceof NodeInterface);
            echo $node->path() . $node->name(), ': ', get_class($node), PHP_EOL;
            if ($node instanceof DirectoryInterface) {
                $ls($node->path() . $node->name());
            }
        }
    })->then(null, function (Throwable $throwable) {
        echo $throwable;
    });
};

$ls(dirname(__DIR__) . DIRECTORY_SEPARATOR . 'src');

Loop::run();

echo '----------------------------', PHP_EOL, 'Done listing directory', PHP_EOL;