Recursive Directory Listing in PHP

list_dir.php

<?php

function list_dir($resource) {
  $files = array();
  $scan  = glob(rtrim($resource, '/') . '/*');
  if (is_file($resource)) {
    array_push($files, $resource);
  }
  if (is_dir($resource)) {
    foreach ($scan as $path) {
      $files = array_merge($files, call_user_func(__FUNCTION__, $path));
    }
  }
  return $files;
}

?>