How can absolute paths be used effectively in PHP includes to avoid path issues?

When including files in PHP, using absolute paths can help avoid path issues by ensuring that the correct file is always included regardless of the current working directory. Absolute paths specify the full path to the file starting from the root directory, making it more reliable than relative paths which are dependent on the current directory.

<?php
include($_SERVER['DOCUMENT_ROOT'] . '/path/to/file.php');
?>