different php cache, cache as php files, A different view to php caching. Cache files are php files, and, datas are, as possible as ready to serve. Also you may use grouping functions to avoid too many cache files and so do I/O cost.
- cache as php file
- group cache for reducing IO noise
- easy to use
If you are interested in performance over php, you may use emCache as an alternative way to cache items.