Copying a folder with contents

I’ve seen several complicated and ugly functions for copying directories and subdirectories, including their contents. This fairly common task can be solved simply with a PHP iterator::

function copyAll($src, $dst) {
  $iterator = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator($src, RecursiveDirectoryIterator::SKIP_DOTS),
    RecursiveIteratorIterator::SELF_FIRST
  );

  foreach ($iterator as $item) {
    if ($item->isDir()) {
      mkdir($dst . DIRECTORY_SEPARATOR . $iterator->getSubPathName());
    } else {
      copy($item, $dst . DIRECTORY_SEPARATOR . $iterator->getSubPathName());
    }
  }
}