newbie question - find records, if/else result?

I'd be very grateful for help on this -

I'm moving from a CDML system to php and am trying to do a find based on a user input field (record id) and a hidden field (expired). If the result for a record has the expired field set to 'no' then I want the browser to return a text string including the record details, if the result has the expired field set to 'yes', then to return a different text string . How do I do this?

In CDML, I simply used

[FMP-IF: expired.eq.no] Click on record id to view details [FMP-FIELD: record number]

[FMP-ELSE] This record has already been used. [/FMP-IF]

Any help / suggestions would be greatly appreciated,

Thanks,

George