/**
  * Get control when configuration is changed by user
  */
 public function w3tc_config_ui_save($config, $old_config)
 {
     if ($config->get(array('example', 'is_title_postfix')) != $old_config->get(array('example', 'is_title_postfix')) || $config->get(array('example', 'title_postfix')) != $old_config->get(array('example', 'title_postfix'))) {
         // flush all content caches, since our extension will now alter
         // content
         w3tc_flush_posts();
     }
 }
/**
 * deprecated
 * Shortcut for page cache flush
 *
 * @return boolean
 */
function w3tc_pgcache_flush()
{
    return w3tc_flush_posts();
}