What are the advantages and disadvantages of using iframes to display PHP content in an HTML file?

Using iframes to display PHP content in an HTML file can provide modularity and separation of concerns, making it easier to manage and update different parts of a webpage independently. However, iframes can also introduce performance issues, as each iframe creates a separate HTTP request, potentially slowing down the loading time of the page. Additionally, iframes may not be as SEO-friendly as directly embedding PHP content into the HTML file.

<!-- Example of embedding PHP content directly into an HTML file -->
<!DOCTYPE html>
<html>
<head>
    <title>PHP Content Embedded</title>
</head>
<body>
    <h1>Welcome to our website!</h1>
    <p><?php echo "This is PHP content embedded in HTML"; ?></p>
</body>
</html>