I had a bad surprise by testing the 2.1.0 version of the SDK. Usually I work with an extension built on the master version of the php-couchbase repository. It works fine (except a reported issue about bucket creation).
Yesterday, on a new project, I checked out the tag 2.1.0 before compiling the extension, and I had fatal errors relating to the parameter $json_asarray of the method CouchbaseBucket::_view. This bug has been fixed by this commit: https://github.com/couchbase/php-couchbase/commit/678bb679de2f8f3b360be7b29a3ca2925da1966f but without release a new version (that could be 2.1.1).
Please, could you tag a new version to allow us to use the SDK with a known behaviour?