Reddit mentions of PHP 5 CMS Framework Development: Expert insight and practical guidance to creating an efficient, flexible, and robust framework for a PHP 5-based content management system

I own a copy of PHP5 CMS Framework Development and wrote a review of it here (there are also a couple of other reviews floating online).

I should emphasis that you shouldn't try to emulate the structure of the framework created in that book. For example it doesn't use Zend_Style_Class_Names which was the standard at the time (you should use namespaces) and almost every component of the framework is a singleton (which is bad, depending on who you talk to). That being said the chapters on database abstraction, internationalization and access control are pretty good.

If you want to buy a book that covers each issue/feature a framework needs to address, I recommend this one. It sets out one way of structuring a framework. After reading it you should compare it's structure to other frameworks (Kohana, Symfony2, Yii) and then pick and choose what you like/dislike.

Well, you're going to need PHP, certainly. (Technically, Django or RoR would work as well, but I think PHP is the easiest, and needs almost no setup.)

You'll need to learn about sessions, database connections, and user management in general. I learned it myself from a book. Here's the link:

http://www.amazon.com/PHP-CMS-Framework-Development-management/dp/1847193579