Veeble-Adam

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May 7, 2013
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Memcached and php-memcache are different.

Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.

php-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.

Refer:

PHP: Memcache - Manual
memcached - a distributed memory object caching system

Hope this helped.