evansolomon/KISSmetrics — comment on commit 2aa28f17799af79008818a667b9d2cc5f12429b7
File: km.php line 153
By evansolomon:

Cool. I wasn't sure if empty() triggered a PHP notice when the key didn't exist at all. Since I'm not actually using this method I just wanted to fix the silent failure. Your solution is better.