Jan Lehnardt points out an update that's been made to the CouchDb PHP library for the JSON API. As posted to the mailing list for the project:

Dear Couch Potatoes (or something), I updated the CouchDb PHP Library and the Demo application BugShrink (our bug-tracker) to the new JSON API.

You can try out this new update via the project's repository or just check out the CouchDb project homepage for more information.