How has the evolution of CSS impacted the way PHP developers handle design elements within their code?

The evolution of CSS has allowed PHP developers to separate the design elements from the code, making it easier to maintain and update the styling of a website. By using CSS, developers can create reusable stylesheets that can be applied to different elements across the site, resulting in a more efficient and organized development process.

<!DOCTYPE html>
<html>
<head>
    <title>PHP and CSS Example</title>
    <style>
        /* External CSS stylesheet */
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
        }
    </style>
</head>
<body>
    <?php
        echo "<h1>Welcome to PHP and CSS!</h1>";
    ?>
</body>
</html>