What are the best practices for understanding the differences between PHP and HTML in optimizing webpage loading?

To optimize webpage loading, it's important to understand the differences between PHP and HTML. PHP is a server-side scripting language that generates dynamic content, while HTML is a markup language used for structuring web pages. To improve loading times, minimize the use of PHP for static content and utilize HTML for static elements whenever possible.

<?php
// Example of using PHP to include an HTML file for static content
include 'header.html';
?>
<!DOCTYPE html>
<html>
<head>
    <title>Optimized Webpage</title>
</head>
<body>
    <h1>Welcome to our optimized webpage!</h1>
    <?php
    // Example of using PHP for dynamic content
    echo "<p>Current time: " . date('Y-m-d H:i:s') . "</p>";
    ?>
</body>
</html>