Unable to connect to second cluster while using same bucket name in PHP configuration cache

Environment:
1. PHP SDK 1.1.5
2. CentOs 6.4
3. Set up the couchbase cache config path in php.ini.
4. Couchbase Enterprise 2.1.0

Test scenario:
1. Set up two separate clusters, representing two separate data centers.
2. Set up the cache config path in php.ini (from another location outside
the clusters)
3. Set up a bucket (any type), with the same name on both clusters.
4. Create a script that first loads some data on cluster one, then
immediately loads the same on cluster two.

Expected Results:
The data should be loaded to cluster two.

Actual Results:
The data never makes it to cluster two because the cache file is by bucket
name. In the cache file, there is the map of just the first cluster.
Subsequent sets and gets use the cache file no matter what hosts are used
in the connection (in code).