PHP is a very popular language. Every PHP developer and hoster should understand the primary attack vectors being used by attackers against PHP applications. This article is the underlying research behind the SANS Top 20 2005's PHP section. The methodology used in the preparation of this article is to review all Bugtraq postings containing the word "PHP" and categorize each unique flaw. The author analyzed the most popular flaws / attacks, and researched prevention techniques, resulting in this article.

Useful stuff on error reporting

This is so awesome I can't even describe it! I've been looking for something like this - it will make editing my css SO much easier.

quite a few free scripts - helpful

Lots of beginning PHP resources and tutorials

My PHP Resources Bookmark List on Diigo. I am a beginner at PHP, so right now, most of these are targeting to a very basic level, most useful for other beginners.