Php 1.2 compatibility with couchbase 3.0

Hello, we have been using php ext sdk 1.2.x with the libcouchbase 2.4.x on couchbase 2.2.0 for a while in our test env with centos 6.5 . Recently, I found out that couchbase 2.2.0 won’t work with the production vps out of the box and may have to switch over to couchbase 3.0.

Question I have is the php 1.2.x sdk backward compatible with couchbase 3.0? I know couchbase 3.0 has lots of new features but we primarily have been using php 1.2.x so was hoping it would be backward compatible.

Appreciate it if someone can clarify on this. Thanks.