In Chapter 3, we included our own custom sidebar using the previous technique. You can also use the WordPress template path inside a basic PHP include function. This technique can come very handy in helping you streamline your theme's code and help keep it easily updatable.
For instance, my index.php, page.php, and category.php pages have different headers and slightly different uses of The Loop, but they all have the exact same page navigation code. This bit of code is small yet, if I ever want to tweak my internal navigation layout, I'll need to touch all three of those pages.
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