PHP: Simplest way to delete a folder (including its contents)

Question

The rmdir() function fails if the folder contains any files. I can loop through all of the the files in the directory with something like this:

Answer 1

function delete_files($dir) {
  if (is_dir($dir)) {
    $objects = scandir($dir);
    foreach ($objects as $object) {
      if ($object != "." && $object != "..") {
        if (filetype($dir."/".$object) == "dir") 
           delete_files($dir."/".$object); 
        else unlink   ($dir."/".$object);
      }
    }
    reset($objects);
    rmdir($dir);
  }
 }