use League\Flysystem\Filesystem;
use VladimirYuldashev\Flysystem\CurlFtpAdapter;
use VladimirYuldashev\Flysystem\CurlFtpConnectionOptions;

$adapter = new CurlFtpAdapter(
  CurlFtpConnectionOptions::fromArray([
      'host' => 'ftp.example.com',
      'username' => 'username',
      'password' => 'password',

      /** optional config settings */
      'port' => 21,
      'root' => '/path/to/root',
      'utf8' => true,
      'ftps' => true, // use ftps:// with implicit TLS or ftp:// with explicit TLS
      'ssl' => true,
      'timeout' => 90, // connect timeout
      'passive' => true, // default use PASV mode
      'ignorePassiveAddress' => true, // ignore the IP address in the PASV response
      'sslVerifyPeer' => 0, // using 0 is insecure, use it only if you know what you're doing
      'sslVerifyHost' => 0, // using 0 is insecure, use it only if you know what you're doing
      'timestampsOnUnixListingsEnabled' => true,

      /** proxy settings */
      'proxyHost' => 'proxy-server.example.com',
      'proxyPort' => 80,
      'proxyUsername' => 'proxyuser',
      'proxyPassword' => 'proxypassword',

      'verbose' => false // set verbose mode on/off
    ])
);

$filesystem = new Filesystem($adapter);