A lightning talk on UUIDs from the maintainer of the ramsey/UUID package library for PHP.
A talk made by Macro Pivetta on "Doctrice ORM Good Practices and Tricks".
This post is for reference and contains a youtube video from Roger H. Newell stepping through compiling your own kernel, with bookmarked timestamps so that you can skip to the point you need.
A fantastic timestamped lecture on defensive PHP. Everyone should watch this!