I created a simple PHP file that just created a CouchbaseCluster object and then print_r() what was returned. The problem is that the return value was empty as the only displayed information was that igbinary warning.
I installed igbinary and PHP told me I had to reinstall couchbase. Long story short, I had to remove couchbase via pecl, then I reinstalled 2.3.0. I figured it could help others save a little time. It was early this morning and my memory is a bit foggy, but I think it told me I had to rebuild couchbase. Being lazy, I use a browser to see phpinfo(). Before I manually added in igbinary, the line in couchbase for igbinary decoder was saying it was disabled. Now, after all this, it’s saying enabled.
Once I solved my igbinary warning, the returned value for the cluster object could be worked with.
Things are working well. Almost normal (being away from my Mac, my workflow suffers greatly).