How can PHP be integrated into HTML for backend functionality while maintaining a clean design for the front end?

To integrate PHP into HTML for backend functionality while maintaining a clean design for the front end, you can use PHP to separate logic from presentation by using templates or MVC frameworks. This allows you to keep your HTML code clean and organized while handling backend processes efficiently with PHP.

<?php
// PHP code for backend functionality

$data = "Hello, World!";

?>

<!DOCTYPE html>
<html>
<head>
    <title>PHP Integration</title>
</head>
<body>
    <h1><?php echo $data; ?></h1>
</body>
</html>