symfony copy dir

copy.php

$fileSystem = new Filesystem();
$fileSystem->mkdir($target);

$directoryIterator = new \RecursiveDirectoryIterator($source, \RecursiveDirectoryIterator::SKIP_DOTS);
$iterator = new \RecursiveIteratorIterator($directoryIterator, \RecursiveIteratorIterator::SELF_FIRST);
foreach ($iterator as $item) {
    if ($item->isDir()) {
        $targetDir = $target.DIRECTORY_SEPARATOR.$iterator->getSubPathName();
        $fileSystem->mkdir($targetDir);
    } else {
        $targetFilename = $target.DIRECTORY_SEPARATOR.$iterator->getSubPathName();
        $fileSystem->copy($item, $targetFilename);
    }
}