Ask HN: Online Class or Resources To Learn PHP

I've recently joined a startup run on Wordpress (the core focus of our product is not technical). I'm mostly in a marketing role, but it would be useful for me to be able to modify the site.

My programming experience is working through the C Programming Language, taking Udacity CS 101, and finishing most of Michael Hartl's Rails Tutorial.

Are there any good, similar resources for PHP? I'm not at the level where I can just read the docs and learn.

I checked Codecademy, Code School and Udacity, but they generally just teach Ruby and Python.

Any suggestions? Thanks