FTP to ZipArchive

example.php

<?php

$zipFilesystem = new Filesystem(new ZipArchiveAdapter($directory.'/zipname.zip'));
$ftpFilesystem = new Filesystem(new Ftp($ftpOptions));
$ftpFilesystem->addPlugin(new ListFiles);

$paths = $ftpFilesystem->listFiles($sourceDir, true);

foreach ($paths as $path) {
  $stream = $ftpFilesystem->readStream($path);
  $destination = substr($path, strlen($sourceDir));
  $zipFilesystem->writeStream($destination, $stream);
  fclose($stream);
}

// Force ZipArchive close
unset($zipFilesystem);