How can relative path references be utilized effectively in PHP includes to ensure successful file inclusion?

Relative path references in PHP includes can be utilized effectively by using the correct path structure to ensure successful file inclusion. To do this, it is important to understand the directory structure of the project and use appropriate relative paths to reference the files that need to be included. By using relative paths, you can avoid hardcoding absolute paths which may cause issues when moving the project to a different server or directory.

<?php
// Include file using relative path
include 'includes/header.php';
?>