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. Key features of the MemProxy are:

• Uses memcached for storage
• Serves cache headers to clients based on TTL of cached data
• Uses custom headers to assemble multiple pieces of cache into one object
• Minimal dependencies.  Only PHP and pecl/memcached needed.
• Small code base.  It is just two files, one when settings are cached.
• Application agnostic.  If the backend is hosted on an HTTP server this can cache it.

Requirements to install MemProxy are:

• PHP 5.2 with the PECL/memcache extension.
• A web server that has rewrite abilities. Apache and Nginx examples provided.
• memcached

Link: MemProxy @ Google Code