What are the differences in functionality and styling between using iframes and divs with include() in PHP for embedding content?

When embedding content in PHP, using iframes allows for embedding external content from other websites, but it may not be as flexible for styling and interacting with the embedded content. On the other hand, using divs with include() in PHP allows for more control over the styling and functionality of the embedded content, but it is limited to content within the same domain.

<?php
// Using iframes to embed external content
echo '<iframe src="https://www.example.com"></iframe>';

// Using divs with include() to embed content from the same domain
include('content.php');
?>