How can developers balance the use of JavaScript and PHP to ensure compatibility with users who have JavaScript disabled?

When users have JavaScript disabled, developers can ensure compatibility by implementing server-side validation and functionality using PHP. This involves creating forms that submit data to the server for processing, rather than relying solely on client-side JavaScript for validation and interaction.

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Process form data and perform server-side validation here
    // Redirect or display appropriate messages based on the validation results
}
?>