June 20, 2015 — This talk is about getting started making plugins. The only requirement is some knowledge of PHP. This talk is ideal for people who have put PHP into functions.php and then been sad when it was lost when changing themes.
March 23, 2015 — This talk covers the theories and functions dealing with validating input and sanitizing output. It starts at the very basic, and wind up with some discussion of the trickier parts of how different kinds of data should be filtered.
October 22, 2013 — This talk is for people that know PHP and have written some in their theme functions file, but don’t know how to pull that out into a plugin. (This is a real time demonstration – no slides available.)
October 6, 2013 — This talk discusses how to speed up your site using caching via easy plugins like WP Super Cache and W3 Total Cache, transients, and server site options like Memcache, APC, and Batcache.