What are the best practices for integrating PHP and JavaScript for dynamic content generation on a website?

When integrating PHP and JavaScript for dynamic content generation on a website, it is important to use AJAX to make asynchronous requests to the server and update the content dynamically without refreshing the page. This allows for a smoother user experience and faster loading times. Additionally, using JSON to pass data between PHP and JavaScript is a common and efficient method.

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

echo json_encode($data);
?>