How can the use of base URL elements in HTML documents improve the organization of PHP includes for CSS files?

Using base URL elements in HTML documents can improve the organization of PHP includes for CSS files by allowing you to define a base URL for all relative URLs in the document. This means that you can set a base URL once at the beginning of the document and then all subsequent relative URLs for CSS files will be resolved relative to that base URL. This can help simplify the inclusion of CSS files in PHP includes by ensuring that the correct paths are always used, regardless of the file's location within the project.

<?php
// Define the base URL for the document
echo '<base href="http://www.example.com/">';

// Include CSS files using the base URL
echo '<link rel="stylesheet" type="text/css" href="css/styles.css">';
?>