Adding Active States to the Navigation4:29 with Alena Holligan
We can use conditionals and variables to make further changes to the HTML output on different pages. In this video, we’ll add a new variable and use a conditional to check its value in our main navigation menu.
Update to html
index.php unordered list for our random items should have a class of "items".
If you forget to add the $section variable to a page, you could see an error. This is why we set "$section = null;" on the index page. If you want to make sure you code works without an error even if $section is not defined, you could include the isset function in you if statement as well.
if (isset($section) && $section == "books")
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