Ask HN: Resources/talks/outlines for modern PHP practices?

I first started on PHP 5-7 years ago when PHP was still a mess. I've been coming back to it now via the company I work for. I'm looking to learn best practices and whatnot for modern PHP. What are your favorite resources/talks describing design patterns and best practices for modern PHP? I'm looking for anything from GC optimization to overall structure of PHP libraries, etc.

Herb Sutter's "Back to Basics: Essentials of Modern C++ Style" is an example of one of my favorite such talks for C++. Hopefully that can steer the discussion.