cache_get

includes/bootstrap.inc, line 320

Versions
4.6 – 4.7
cache_get($key)
5
cache_get($key, $table = 'cache')
6
cache_get($cid, $table = 'cache')
7
cache_get($cid, $bin = 'cache')

Return data from the persistent cache.

Parameters

$key The cache ID of the data to retrieve.

▾ 6 functions call cache_get()

archive_calendar in modules/archive.module
Generates a monthly calendar, for display in the archive block.
check_markup in modules/filter.module
Run all the enabled filters on a piece of text.
locale in modules/locale.module
Provides interface translation services.
menu_get_menu in includes/menu.inc
Return the menu data structure.
page_get_cache in includes/bootstrap.inc
Retrieve the current page from the cache.
variable_init in includes/bootstrap.inc
Load the persistent variable table.

Code

<?php
function cache_get($key) {
  global $user;

  // Garbage collection necessary when enforcing a minimum cache lifetime
  $cache_flush = variable_get('cache_flush', 0);
  if ($cache_flush && ($cache_flush + variable_get('cache_lifetime', 0) <= time())) {
    // Time to flush old cache data
    db_query("DELETE FROM {cache} WHERE expire != %d AND expire <= %d", CACHE_PERMANENT, $cache_flush);
    variable_set('cache_flush', 0);
  }

  $cache = db_fetch_object(db_query("SELECT data, created, headers, expire FROM {cache} WHERE cid = '%s'", $key));
  if (isset($cache->data)) {
    // If the data is permanent or we're not enforcing a minimum cache lifetime
    // always return the cached data.
    if ($cache->expire == CACHE_PERMANENT || !variable_get('cache_lifetime', 0)) {
      $cache->data = db_decode_blob($cache->data);
    }
    // If enforcing a minimum cache lifetime, validate that the data is
    // currently valid for this user before we return it by making sure the
    // cache entry was created before the timestamp in the current session's
    // cache timer.  The cache variable is loaded into the $user object by
    // sess_read() in session.inc.
    else {
      if (isset($user->cache) && ($user->cache > $cache->created)) {
        // This cache data is too old and thus not valid for us, ignore it.
        return 0;
      }
      else {
        $cache->data = db_decode_blob($cache->data);
      }
    }
    return $cache;
  }
  return 0;
}
?>
 
 

All source code and documentation on this site is released under the terms of the GNU General Public License, version 2 and later. Drupal is a registered trademark of Dries Buytaert.