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I get an undefinded variable message when errors are turned on.
I was hoping the value of $thisPage comes from
Aside: Interesting use of a DL-list to display a list of links. (Why not an unordered list?) Note, however, that HTML5 requires at least one DT element (per DD group) to be valid. (HTML4 allowed the DT to be omitted.)
I originally had just one vertical sidebar which I put in an include file, I then added a horizontal dropdown menu (as far as i know you can't do a PHP 'current page' for that like you can in a traditional menu) and there is some kind of conflict between the two.
...the problems only happen in my test server.... My actual website works fine online and I get no parsing errors
As I was not highlighting the current page on this menu I did not think I needed to define those pages.