Flexcode SDK : I want globel search on the basis of finger print impression without using any user_id

I am integrating flexcodeSDK with my application using php and mysql. I am trying to register a new record . As per the demo given, it is mandatory to pass the user id of user for whom i am adding the finger prints.

But in my application i am registering finger prints in the first step of registration (Add User) so there is no user ID. Now how do i handle this case?

Actually my requirement is that i want to search ( global search with single button ) record from database on the basis of perticular finger print.Please help. Here is my code

process_verification.php

process_register.php