作为一个想要做一些PHP工作的C＃开发人员，我应该[购买/阅读]将自己介绍给PHP？

I've got the bare minimum to handle the Linux/MySQL parts of the stack, but I want to have a basic grasp of PHP before I dive in. I'll be working on WordPress plugins, in case there's anything specifically interesting for that.I've got the bare minimum to handle the Linux/M