How can separate JavaScript files improve the organization and development of PHP projects?

Separate JavaScript files can improve the organization and development of PHP projects by keeping the client-side code separate from the server-side code. This separation allows for better organization, easier maintenance, and improved collaboration between front-end and back-end developers.

<!DOCTYPE html>
<html>
<head>
    <title>PHP Project</title>
    <script src="script.js"></script>
</head>
<body>
    <h1>Welcome to my PHP project!</h1>
</body>
</html>