How can HTML and PHP code be optimized to ensure elements do not stretch or resize unexpectedly?

To ensure elements do not stretch or resize unexpectedly, it is important to set fixed widths and heights for elements in both the HTML and PHP code. This will help maintain the layout and prevent any unexpected resizing or stretching of elements.

<div style="width: 200px; height: 100px;">
    <?php 
        // PHP code here
    ?>
</div>