What are the potential pitfalls of including JavaScript code in a PHP file?

Including JavaScript code in a PHP file can lead to mixing server-side and client-side logic, making the code harder to maintain and debug. It can also result in slower page loading times as the server needs to process both PHP and JavaScript. To avoid these pitfalls, it's recommended to separate the server-side PHP code from the client-side JavaScript code by using separate files for each.

<?php
// PHP code here

?>

<!DOCTYPE html>
<html>
<head>
    <title>Example Page</title>
    <!-- Include external JavaScript file -->
    <script src="script.js"></script>
</head>
<body>
    <!-- HTML content here -->
</body>
</html>