What are the differences between Java and JavaScript in the context of web development with PHP?

Java and JavaScript are both popular programming languages used in web development, but they serve different purposes. Java is a server-side language often used for building back-end applications, while JavaScript is a client-side language used for adding interactivity to web pages. When working with PHP in web development, it's important to understand the differences between Java and JavaScript to determine which language is best suited for a particular task.

// Example PHP code snippet demonstrating the use of Java and JavaScript in web development

// Using Java for server-side processing
$javaCode = "
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println('Hello, World!');
    }
}
";
// Using JavaScript for client-side interactivity
$javascriptCode = "
document.getElementById('demo').innerHTML = 'Hello, World!';
";