gistfile1.php

<?php
function _pwdc_section_save_stylesheet($data, $tid = NULL, $name = NULL) {
  $path = 'public://pwdc_section';
  if (file_prepare_directory($path, FILE_CREATE_DIRECTORY)) {
    $name = $name ? $name : ($tid ? 'pwdc-section-' . $tid . '.css' : 'pwdc-section.css');
    $file = $path . '/' . $name;

    file_unmanaged_save_data($data, $file, FILE_EXISTS_REPLACE);
    // Set standard file permissions for webserver-generated files.
    drupal_chmod($file);
  }
}