php dir structure

some info on dir structure:

http://zft.backupdiy.com/2006/12/22/file-structure-redesign-2/

http://framework.zend.com/wiki/display/ZFDEV/Choosing+Your+Application%27s+Directory+Layout



and here's on on auth and acl:

http://devzone.zend.com/node/view/id/1665