2 Active Directories

Is there a way to check user credentials from two different active directories. I would like to set 1 active directory (e.g. members.club.com) to check for credentials, if the person is not in the first active directory that it will search a second active directory (e.g. friends.club.com) if this person’s credentials is existent. Is this possible without changing too much from the php files.

Our settings will work if only the first or the second active directory is set.

Thank you for the help.