+memcached_fetch_execute() is a callback function for result sets. Instead
+of returning the results to you for processing, it passes each of the
+result sets to the list of functions you provide. It passes to the function
+a memcached_st that can be cloned for use in called the cluster (it can not
+be used directly). It also passed a result set which does not need to be freed.
+Finally it passes a "context". This is just a pointer to a memory reference
+you supply the calling function.
+