In what ways can CSS proficiency enhance the development of PHP-based layouts like 3-column designs?

CSS proficiency can enhance the development of PHP-based layouts like 3-column designs by allowing for better styling and positioning of elements on the page. With CSS, developers can create responsive layouts that adjust to different screen sizes, improve the overall design aesthetics, and make the website more user-friendly.

<!DOCTYPE html>
<html>
<head>
    <style>
        /* CSS for 3-column layout */
        .container {
            display: flex;
        }
        .column {
            flex: 1;
            padding: 10px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="column">
            <?php // PHP code for first column content ?>
        </div>
        <div class="column">
            <?php // PHP code for second column content ?>
        </div>
        <div class="column">
            <?php // PHP code for third column content ?>
        </div>
    </div>
</body>
</html>