What are the differences between using PHP and JavaScript to handle dynamic content display on a webpage?

When handling dynamic content display on a webpage, PHP is typically used for server-side scripting to generate HTML content before it is sent to the client's browser. On the other hand, JavaScript is used for client-side scripting to manipulate the HTML content already rendered in the browser. PHP is executed on the server, while JavaScript is executed on the client's browser.

<?php
// PHP code to handle dynamic content display
$dynamic_content = "Hello, World!";
echo $dynamic_content;
?>