[PEPr] Comment on Caching::phpfastcache

After looking at the code, I agree with Bertand. This class is doing too much. For example, emailing error messages does not belong in a cache library. There is definitely room in PEAR for a cache library, but the code needs to be split into multiple reusable classes rather than one monolithic static class. Serializing cache data is potentially a security issue as a vulnerability in any backend now has the potential to execute code on the server. -- http://pear.php.net/pepr/pepr-proposal-show.php?id=692