I think that both are functionally the same, but they simply have different authors, and the one is simply named more appropriately than the other.
Memcache module provides handy procedural and object oriented interface to memcached, highly effective caching daemon, which was especially designed to decrease database load in dynamic web applications.
The Memcache module also provides a session handler (memcache).
MemcacheD s a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.
This extension uses libmemcached library to provide API for communicating with memcached servers. It also provides a session handler (memcached).
They are not identical. Memcache is older but it has some limitations. I was using just fine in my application until I realized you can't store literal
FALSE in cache. Value FALSE returned from the cache is the same as FALSE returned when a value is not found in the cache. There is no way to check which is which. Memcached has additional method (among others) Memcached::getResultCode that will tell you whether key was found.
Because of this limitation I switched to storing empty arrays instead of
FALSE in cache. I am still using Memcache, but I just wanted to put this info out there for people who are deciding.
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