Caching paginated results, purging on update - how to solve?

Question

I\'ve created a forum, and we\'re implementing an apc and memcache caching solution to save the database some work.

I started implementing the cache layer with keys like

Answer 1

I've managed to solve this by extending the memcache class with a custom class (say ExtendedMemcache) which has a protected property which will contain a hash table of group to key values.

The ExtendedMemcache->set method accepts 3 args ($strGroup,$strKey, $strValue) When you call set, it will store the relationship between $strGroup, and $strKey, in the protected property and then go on to store the $strKey to $strValue relationship in memcache.

You can then add a new method to the ExtendedMemcache class called "deleteGroup", which will, when passed a string, find that keys associated to that group, and purge each key in turn.

It would be something like this: http://pastebin.com/f566e913b I hope all that makes sense and works out for you.

PS. I suppose if you wanted to use static calls the protected property could be saved in memcache itself under it's own key. Just a thought.