What is the best practice for including SVG files in HTML documents using PHP?

When including SVG files in HTML documents using PHP, it is best practice to use the `file_get_contents()` function to read the contents of the SVG file and then output it directly into the HTML document using the `echo` statement. This ensures that the SVG file is properly included and displayed within the HTML document.

<?php
$svg_content = file_get_contents('path/to/your/file.svg');
echo $svg_content;
?>