Over on the O'Reilly Network this morning, there's a new piece with a few helpful hints on making your code a bit more secure from the outside world.

Most of the tips in Ten Security Checks for PHP, Part 1 are pretty standard, things like: Avoid Using Variables When Accessing Files, and Do Not Trust Global Variables. Tips like these can either be paid attention to now, or can be found out the hard way later, with SQL injections through forms, or even variables being called that never should have existed. Since this is just part one, there'll be more of these coming, but I'd recommend this reading to everyone out there. Even if you've been doing PHP for a long time now, it's nice to catch up and understand the security of your code better.