Drupal 8: Deletes all files and directories in the specified filepath recursively

deleteDirectoryContentRecursively.php

<?php
  /**
   * Deletes all files and directories in the specified filepath recursively.
   *
   * @param $path
   * @param bool $deleteDir
   *   TRUE if you need to delete also directory in $path.
   *   FALSE if you need to delete only content of dir and its subdirs.
   *
   * @return bool
   *   FALSE if errors.
   */
  protected function deleteDirectoryContentRecursively($path, $deleteDir = FALSE) {
    if (is_dir($path)) {
      $dir = dir($path);
      while (($entry = $dir->read()) !== FALSE) {
        if ($entry == '.' || $entry == '..') {
          continue;
        }
        $entry_path = $path . '/' . $entry;
        $this->deleteDirectoryContentRecursively($entry_path, TRUE);
      }
      $dir->close();

      if ($deleteDir) {
        \Drupal::service('file_system')->rmdir($path);
      }
      return TRUE;
    }
    return file_unmanaged_delete($path);
  }