Great presentation, please post slides.
It was a good talk about the basics of Regex, FSM and Graphs. I would have liked to see a code example of a graph inside php. It also would have been nice to go over the SPL data structures as well. I have seen a number of times where developers rewrite DLL's, heaps and queues when it is not needed.
Helped me understand git much better, despite years of use.
Amazing keynote!
Great talk and examples of what it takes to maintain an OSS project