The next script you'll create is one that can be used to determine what kind of browser a users may be using on their local computer to browse your website. This is an example of the PHP script you can use inside of your hello_world.php3 script.
The browser will display something that looks like the following:
The mozilla, or browser type is displayed due to the PHP script being parsed, or read through. This command can be used several ways. One way that a webmaster / web designer may find useful is to redirect users to different pages of a website based upon their browser type. Here's an example of the script that can be used to accomplish just that.