[MarkFL]

Okay, the first thing is, in a plugin you don't want to include the PHP tags. If your code is in an external file called by a plugin, then you do need the tags.

The hook location "infractiondata_postsave" is a good one (assuming you want this code to execute after the infraction is given), and you'll need to make the $userinfo array global to access it. This array will contain information regarding the user receiving the infraction.

You first query looks like it needs some tweaking, but please let me know exactly what you want to accomplish with this code, and I will try to point you in the right direction.