How can PHP scripts be included in a forum thread?

To include PHP scripts in a forum thread, you can use the PHP `include` or `require` functions to insert the script into the thread. This allows you to reuse PHP code across multiple pages without duplicating it. Simply create a separate PHP file with the code you want to include and use the `include` or `require` function to insert it into the forum thread.

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