Thank you for your replies. 

I’m currently working with Schema/Migration support in Doctrine. So far I’ve concluded that in Doctrine we will not able to support 'CREATE DATABASE’.

Is that a correct conclusion - and are the any plans for db creation support in the Interbase driver in the future ?

As a sidenote, I’m proceeding with the PDOFirebird implementation as Jimi suggested, and will continue with the Interbase development afterwards.