<?php

use League\Flysystem\Filesystem;
use League\Flysystem\Adapter\Local;
use League\Flysystem\Plugin\AbstractPlugin;

// Create your custom Flysystem plugin
class BackupPlugin extends AbstractPlugin
{
    public function getMethod()
    {
        return 'backupFiles';
    }
    
    public function handle($dir)
    {
        $fs = $this->filesystem;
        $backupPath = $dir . '/backup';
        
        $fs->assertPresent($dir);
        
        if (!$fs->has($backupPath)) {
            $fs->createDir($backupPath);
        }
        
        foreach ($fs->listContents($dir) as $file) {
            if ('file' === $file['type']) {
                // do some safer backup than this in your code!
                $backupFile = $backupPath . '/' . $file['basename'];
                if ($fs->has($backupFile)) {
                    $fs->delete($backupFile);
                }
                $fs->copy($file['path'], $backupFile);
            }
        }
    }
}

// Create Flysystem filesystem object
$dir = __DIR__;
$adapter = new Local($dir);

$fs = new Filesystem($adapter);

echo '<b>All files in "files" directory</b>' . PHP_EOL;
foreach ($fs->listContents('files') as $file) {
    echo $file['path'] . PHP_EOL;
}

// Add and use custom BackupPlugin
$fs->addPlugin(new BackupPlugin());
$fs->backupFiles('files');

$fs->assertPresent('files/backup');

echo '<b>All files in new "files/backup" directory</b>' . PHP_EOL;
foreach ($fs->listContents('files/backup') as $file) {
    echo $file['path'] . PHP_EOL;
}

All files in "files" directory
files/file1.txt
files/file2.txt
files/file3.txt
All files in new "files/backup" directory
files/backup/file1.txt
files/backup/file2.txt
files/backup/file3.txt

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PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8