public static function loadGroups()
{
global $sql;
if (!(self::$groups = $sql->getCache('groups'))) {
$query = $sql->query('SELECT * FROM ' . DB_PREFIX . 'groups');
while ($row = $query->fetch(PDO::FETCH_ASSOC)) {
self::$groups[$row['id']] = $row;
}
$sql->putCacheContent('groups', self::$groups);
}
}