What are some common pitfalls to avoid when using PHP and JavaScript together to vary content on a webpage?

One common pitfall to avoid when using PHP and JavaScript together to vary content on a webpage is mixing server-side and client-side logic incorrectly. To solve this issue, ensure that PHP generates the necessary data and JavaScript handles the dynamic content updates on the client side. Separating these responsibilities will help maintain a clean and organized codebase.

<?php
// PHP code to generate dynamic content
$data = [
    'name' => 'John Doe',
    'age' => 30
];
echo json_encode($data);
?>