Right now, one of my main projects at work is a totally new theme for the official news outlet for a major corporation. Along with a million other changes, one thing that needs to happen ASAP after switching to the new theme is that the image thumbnail sizes – controlled through Settings › Media in wp-admin – need to be changed.
Of course, being the lazy, automation-obsessed developer that I am, I wanted to find a way to automatically set these thumbnail sizes the instant we changed themes. Fortunately, where there’s a hook, there’s a way to make this happen automatically.
