Articles on OO apps in PHP, also Object-Relational mapping in PHP?

I'm wondering if there are any articles or other material describing how to design PHP web applications in a highly object oriented fashion? Specifically, object relational mapping, using classes for nearly everything (as appropriate), etc. The articles don't have to be PHP specific, but PHP's OO/class facilities leave a bit to be desired in comparison to say Java, so how this is done in PHP would be interesting. I've read a few PHP articles, a couple books, etc. on the "typical" (my impression) way of designing PHP web apps, where it's pretty much a 2 layer setup of UI and database, and there is no encapsulation/data hiding, and classes/objects aren't used much. Pointers to any material of this nature would be appreciated. ____ Chris Bailey mailto:chris@codeintensity.com Code Intensity http://www.codeintensity.com