public function update()
{
$site_id = isset($_REQUEST['id']) ? (int) $_REQUEST['id'] : get_current_blog_id();
if (1 > $site_id) {
return false;
}
$titles = wp_cache_get($this->cache_key, $this->cache_group);
if (!isset($titles[$site_id])) {
return false;
}
unset($titles[$site_id]);
wp_cache_set($this->cache_key, $titles, $this->cache_group);
return true;
}