New from the PHPFour website, there's this post with a few tips to help you become a "kick-ass PHP ninja" in your development.

You've been developing web applications using PHP for a couple months now and are finding it very enjoyable. Although you feel that you're doing quite good, you're not sure whether its the end. [...] If that's the scenario, then this post if for YOU.

Its broken up into two methods to move forward in your career as a developer - the technical way and the personal way. The technical way involves things like using version control and adhering to a coding standard. The personal way includes tips like "keep yourself updated" and "start community involvement".