Is it considered a best practice to separate JavaScript and PHP code in web development projects, and if so, why?

It is considered a best practice to separate JavaScript and PHP code in web development projects to improve code organization, maintainability, and readability. By keeping the client-side JavaScript code separate from the server-side PHP code, it is easier to make changes or updates to each part of the code without affecting the other.

<?php
// PHP code here
?>
<script>
// JavaScript code here
</script>