How to Build a WordPress Plugin in 10 Minutes
readwrite.com/2010/12/28/how-to-build-a-wordpress-plugin
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
PHP Heaven is running a tutorial on building WordPress plugins. The tutorial is aimed at developers with a solid understanding of PHP and some familiarity with WordPress. I watched a similar tutorial live at WordCamp Portland in 2009, and it's true: if you know PHP and the correct WordPress commands, you can build a a marginally useful plugin in less than ten minutes.