* @param string $session_id Session ID with format: [a-z0-9]{26}
* @param string $session_data Serialized session data
* @return boolean Returns false if parameters are missing, true otherwise
* @param string $session_id Session ID with format: [a-z0-9]{26}
* @param string $session_data Serialized session data
* @return boolean Returns false if parameters are missing, true otherwise