What are the potential pitfalls of having two index.php files in a CMS for mobile layout?

Having two index.php files in a CMS for mobile layout can lead to confusion and maintenance issues as it can be difficult to keep both files in sync with updates and changes. To solve this issue, it is recommended to use responsive design techniques and media queries in a single index.php file to ensure that the layout adapts to different screen sizes.

<?php
// Example of using media queries in a single index.php file for mobile layout

// HTML content for desktop layout
echo "<div class='desktop-layout'>Desktop content here</div>";

// Media query for mobile layout
echo "<style>";
echo "@media (max-width: 768px) {
    .desktop-layout {
        display: none;
    }
    .mobile-layout {
        display: block;
    }
}";
echo "</style>";

// HTML content for mobile layout
echo "<div class='mobile-layout'>Mobile content here</div>";
?>