Cruciforum: crucially simple
Stuart Langridge's crucially simple PHP forum software. Featuring, no accounts/registrations, spam protection and gravatars. The software has been built with Joel Spolsky's thoughts on forum design in mind — just like Joel's software discussion forum, it is deceptively simple.
my little forum
A nice looking PHP and MySQL forum application with threaded discussions. If you are interested in simple software, this might be worth a look.
The no-framework PHP MVC framework - Rasmus' Toys Page
"What I was hoping to get across here is a simple example of how you can use PHP as-is, without additional complex external layers, to apply an MVC approach with clean and simple views and still have all the goodness of fancy Web 2.0 features. If you think I am out to personally offend you and your favourite framework, then you have the wrong idea."
Last we checked, PHP IS a framework
A good post regarding PHP and frameworks. Why use a framework when PHP IS a framework?
PHP on Hormones
An interesting talk by Rasmus Lerdorf, the creator of PHP. Rasmus discusses the history of PHP, programming and programmers, web security and APIs.
PHP Sucks, But It Doesn't Matter
"PHP isn't so much a language as a random collection of arbitrary stuff, a virtual explosion at the keyword and function factory."
Some common regular expressions
A list of 7 common regular expressions for verifying email addresses, phone numbers, usernames, postal codes, SQL dates, IP addresses and domain names. The expressions purposefully err on the side of caution, allowing more than they disallow.
