Can anyone *really* explain opcode caching with PHP?

[gcaplan]

Hi guys

You've been brilliant - so for now I go with php-fpm and xcache, and I
actually understand what's happening!

As I say, the community might consider adding this info to the FAQs, as
there's a lot of misleading blogs and post out there on this whole issue
of fastcgi and opcode caching...

Thanks for all your help!

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,223556,223583#msg-223583