yiisoft/yii — pull request #1376 by paystey (2012-09-11 12:46:24+00:00)
Title: Allow Negating Categories in CLogRoute

Provides a fix for #84

Prefix any category with a "!" to discard any matches, if there are only negative categories listed, it assumes everything else matches (like blank does).

Note.
Negates must precede matches.