* @param array|string|bool $groups Query group(s), or false for the generic reader
* @param string|bool $domain Domain ID, or false for the current domain
* @param int $flags Bitfield of CONN_* class constants
* @param array|string|bool $groups Query group(s), or false for the generic reader
* @param string|bool $domain Domain ID, or false for the current domain
* @param int $flags Bitfield of CONN_* class constants