Here is another great WordPress function to test if you are in a subcategory or the actual parent category and if so return true. This function is pretty much identical in concept to the is_page_or_sub() function I released previously. However, it just tests categories and not pages. Also, the code is significantly different since there are a few more available pre existing function we can build upon here. For example, the cat_is_ancestor_of() function comes in really handy and does a lot of the heavy lifting for this simple but very powerful function. I use this very function to build complex category based navigation and ...