title: File or APC Cache Engine in CakePHP?
body: <p>CakePHP offers support for APC, XCache and Memcache in addition to its default caching engine.  Having had some problems with my application sporadically caching broken pages for no known reason, I've decided to try another engine to see if that makes a difference.</p>
  
  <p>XCache and Memcache both seem as though they might take a little bit more setup, but APC appears to be literally a case of changing one line in the core.php.  My question is, where can I find information about <strong>why</strong> I should choose APC over the default engine?  What are the pros and cons?  It can't really be a case of "just try them both and see if one feels better than the other" (can it?), but a basic snoop around hasn't revealed a simple breakdown of the differing merits of cache engines in Cake.</p>
  
  <p>Can anyone explain the mysterious workings of cache engines in Cake to me?  Or point me to a resource that does?  Bonus points if XCache and Memcache are also compared, because they might be my next port of call...</p>