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7 drupal_render_cid_parts($granularity = NULL)

Helper function for building cache ids.


$granularity: One or more cache granularity constants, e.g. DRUPAL_CACHE_PER_USER to cache for each user separately or DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE to cache separately for each page and role.

Return value

An array of cache ID parts, always containing the active theme. If the locale module is enabled it also contains the active language. If $granularity was passed in, more parts are added.

3 calls to drupal_render_cid_parts()


drupal/includes/, line 5951
Common functions that many Drupal modules will need to reference.


function drupal_render_cid_parts($granularity = NULL) {
  global $theme, $base_root, $user;

  $cid_parts[] = $theme;
  // If Locale is enabled but we have only one language we do not need it as cid
  // part.
  if (drupal_multilingual()) {
    foreach (language_types_configurable() as $language_type) {
      $cid_parts[] = $GLOBALS[$language_type]->language;

  if (!empty($granularity)) {
    // 'PER_ROLE' and 'PER_USER' are mutually exclusive. 'PER_USER' can be a
    // resource drag for sites with many users, so when a module is being
    // equivocal, we favor the less expensive 'PER_ROLE' pattern.
    if ($granularity & DRUPAL_CACHE_PER_ROLE) {
      $cid_parts[] = 'r.' . implode(',', array_keys($user->roles));
    elseif ($granularity & DRUPAL_CACHE_PER_USER) {
      $cid_parts[] = "u.$user->uid";

    if ($granularity & DRUPAL_CACHE_PER_PAGE) {
      $cid_parts[] = $base_root . request_uri();

  return $cid_parts;