authcache-expire.php

<?php
/**
 * Implements hook_expire_cache().
 *
 * Expire cache support for the builtin cache handler.
 */
function authcache_builtin_expire_v2_expire_cache($urls, $wildcards, $object_type, $object) {
  $cids = array();
  $wildcard_cids = array();

  $authcache_urls = array();
  foreach ($urls as $path => $url) {
    list ($path, $options) = $url;
    $options['absolute'] = FALSE;
    $authcache_urls[$path] = url($path, $options);
  }

  foreach (authcache_enum_keys() as $key) {
    foreach ($authcache_urls as $path => $url) {
      $cid = $key . $url;

      if (empty($wildcards[$path])) {
        $cids[] = $cid;
      }
      else {
        $wildcard_cids[] = $cid;
      }
    }
  }

  if (!empty($cids)) {
    cache_clear_all($cids, 'cache_page');
  }

  foreach ($wildcard_cids as $cid) {
    cache_clear_all($cid, 'cache_page', TRUE);
  }
}