How can PHP files be included in HTML files without using iframes?

To include PHP files in HTML files without using iframes, you can use the `include` or `require` functions in PHP. These functions allow you to insert the content of a PHP file into another file at the point where the function is called. This way, you can have dynamic content from PHP files seamlessly integrated into your HTML files.

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