There are primarily two clients used with PHP. One is the older, more widespread pecl/memcache and the other is the newer, less used, more feature rich pecl/memcached. Both support the basics such as multiple servers, setting vaules, getting values, increment, decrement and getting stats. Here are some more advanced features and information.
My entities are Series, which has many Seasons, which have many Episodes. When an episode is created or updated I want to also update its related Series so that it always has correct firstYear and lastYear data for when the series was broadcasted.