Excellent talk about - most likely - a very niche market. After a quick explanation about the different steps in compiling (php/hack) source code to actual runnable code, he showed the basics of writing a hhvm extension (sidenode: cmake is not only for c++) and continued with a real-life example in the form of openGL.
This is a great introduction about graphs and graph databases.
Enjoyed the talk
Interesting presentation
What a great talk, I really enjoyed it :)
Especially the last part with OpenGL rendered image.
The talk has really good advice on how to refactor your code (and why).