Thanks for the reply.
The page returned by phpinfo() says:
PDO support enabled
PDO drivers mysql, sqlite, sqlite2
I thought this looked like I was OK on the PDO front. I’m wrong then?
Thanks all, I’m now up and running. I’d written an extended description of how I did it, but it appears to have gotten lost. Key was getting my PDO_mysql straight in my php.ini and reaccessing the page by navigating back and then forward to the database details page again rather than simply refreshing it. Much obliged.