What are the potential pitfalls of trying to display HTML files from one folder on another HTML page in PHP?

The potential pitfall of trying to display HTML files from one folder on another HTML page in PHP is that the browser may not be able to interpret the PHP code correctly if the files are not properly included. To solve this issue, you can use the `include` or `require` functions in PHP to include the HTML files within the PHP code, ensuring that they are displayed correctly on the page.

<?php
include 'path/to/your/html/file.html';
?>