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I have been using PHP since 2008 and found the <?php include 'file'; ?> very useful. Especially for site navigation. When a new page is added to the site, I used to spend a lot of time editing many pages of the site just to include one new page.
With the include('file'), I create a navigation file that has links to the pages of the site. When I add a new page to the site I only update one file which is then included in the pages of the site. I also have a footer file that is included in most pages of my site. See it below the white content area of the page.
<?php include 'include/footer.php';?>