What are the best practices for passing data between PHP and HTML files?

When passing data between PHP and HTML files, the best practice is to use PHP to process the data and then embed it within the HTML file using PHP echo or print statements. This ensures that the data is securely passed and displayed in the HTML output. Additionally, using PHP variables to store and manipulate the data before displaying it helps maintain code organization and readability.

<?php
$data = "Hello, World!";
?>
<!DOCTYPE html>
<html>
<head>
    <title>Passing Data Between PHP and HTML</title>
</head>
<body>
    <h1><?php echo $data; ?></h1>
</body>
</html>