In PHP development, what are some considerations for merging multiple websites into one, particularly in terms of maintaining consistent layouts like footers?

When merging multiple websites into one in PHP development, one consideration is to create a centralized footer file that can be included on all pages to maintain consistent layouts. This footer file can contain all the necessary HTML and PHP code for the footer, making it easy to update across all pages at once. By including this footer file in each page, you ensure that the layout remains consistent without having to manually update each individual page.

<?php include 'footer.php'; ?>