PHP Security Mistakes
Dev Shed has an article about common PHP security mistakes, and how to avoid them. It’s fairly basic stuff — but a good review for even the most expert programmers. If you’re not following their advice, you should be.
On a completely unrelated note, I noticed that Dev Shed appears to be using mod_rewrite or something with very similar behaviour. I checked it out at Netcraft, on the off chance that Dev Shed had that information exposed. Interestingly, Netcraft replied that it has been asked not to report on Dev Shed — which is a request I didn’t even know could be made. You learn something every day . . .