I’m sorry, I replied to the wrong post.
I can’t believe this is more clear in documentation (I’ve searched the forums as well) but I found it under a php 101 site. Its the “not” statement and its placement was a bit different for this php version I suppose.
<?php if (!in_category(‘3’)) continue; ?>
The not statement is the ! in front of the category stating that if NOT in category 3 to continue.