Vinu Thomas points out a new "server" project that's been created to aid in caching for your app - MemProxy.

A pretty cool project in PHP - Memproxy is a caching proxy "server" that uses memcached for storing the cache. This project uses PHP scripts to handle caching using memcache.

The server uses memcached to store the information and automatically manages things like TTL, custom headers and is "application agnostic" all wrapped up in a small codebase with minimal dependencies.