private static function site_unique()
{
static $unique = false;
if (!$unique) {
$unique = '';
if (isset(Config::get('db_connection')->connection_string)) {
$unique .= Config::get('db_connection')->connection_string;
}
if (isset(Config::get('db_connection')->prefix)) {
$unique .= Config::get('db_connection')->prefix;
}
$unique = md5($unique);
}
return $unique;
}