With the release of php5.3 alpha1 recently I thought it practical to setup a test environment.

An introduction to using joins and unions in your MySQL queries

This tutorial deals with the various security issues a PHP developer, or any person who writes web applications, might face. The tutorial is aimed towards beginners, but other people may find some of the information the tutorial contains useful as well. Topics such as SQL injections, cross-site scripting, remote file inclusion attacks and session security are covered. The tutorial also covers how you will best hide as much information from potential attackers as possible in order to further enhance your web application's security. This tutorial can be used as a reference although all the content it contains is vital for anyone who wishes to write applications that will run on a webserver regardless of whether the language is PHP or another server-side scripting language.

Just a little reminder that we are on IRC as well.

An introduction to UML Class Diagrams and class relations.