PHP - Get folders from path

directories.php

<?php
$path = DIRECTORY_SEPARATOR . 'path' . DIRECTORY_SEPARATOR . 'folder';
$denies = array('..', '.');
$entries = array_diff(scandir($path), $denies);

foreach ($entries as $key => $file_or_folder) {
  if (!is_dir($path . DIRECTORY_SEPARATOR . $file_or_folder)) {
    unset($entries[$key]);
  }
}

$folders = array_values($entries);

var_dump($folders);