Hi Charles:
Sadly enough, the PHPClasses site does not read the contents from the standard README.md file, but that option has been wiped out this class since a very long time already (a year or so), so I'm sorry for that. I will update the documentation on this site.
The good news though, is that I've also wrote a CacheManager class which should complement this one. This class is available in Github:
github.com/unreal4u/cacheManager
And will allow you to use one or more cache types. At the time being, only APC and file-system based cache is supported.
For better cache implementations (cacheManager was only a playground to check on what could be done with Reflection), I suggest taking a look at ZendCache (https://packagist.org/packages/zendframework/zend-cache) or any other (https://packagist.org/search/?q=cache) which will do stuff way better than my own.
The decision was based on the idea that a database wrapper should only do database stuff, while caching should be done by a proper cache wrapper. This helps keeping clean, testable and easy to understand coding standards.
As we're on it, I would also recommend checking out the latest version of this class on Github, as all the development occurs there:
github.com/unreal4u/db_mysqli
Greetings.