<?php

use Symfony\Component\Filesystem\Filesystem;

$fs = new Filesystem();

$dir = $rootDir . '/fs';
$fs->mkdir($dir, 0775);
echo 'Directory fs created' . PHP_EOL;

dump($fs->exists($dir . '/Library.php'));

$fs->copy($rootDir . '/files/php/lib/Library.php',
    $dir . '/Library.php');

dump($fs->exists($dir . '/Library.php'));

Directory fs created

^ false

^ true

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8