application/Cache.php

   1 <?php
   2 /**
   3  * Cache utilities
   4  */
   5
   6 /**
   7  * Purges all cached pages
   8  *
   9  * @param string $pageCacheDir page cache directory
  10  *
  11  * @return mixed an error string if the directory is missing
  12  */
  13 function purgeCachedPages($pageCacheDir)
  14 {
  15     if (! is_dir($pageCacheDir)) {
  16         $error = sprintf(t('Cannot purge %s: no directory'), $pageCacheDir);
  17         error_log($error);
  18         return $error;
  19     }
  20
  21     array_map('unlink', glob($pageCacheDir.'/*.cache'));
  22 }
  23
  24 /**
  25  * Invalidates caches when the database is changed or the user logs out.
  26  *
  27  * @param string $pageCacheDir page cache directory
  28  */
  29 function invalidateCaches($pageCacheDir)
  30 {
  31     // Purge cache attached to session.
  32     if (isset($_SESSION['tags'])) {
  33         unset($_SESSION['tags']);
  34     }
  35
  36     // Purge page cache shared by sessions.
  37     purgeCachedPages($pageCacheDir);
  38 }