This predefined variable shows the filename or path of the PHP page that is currently running.
Current value: /infost440/a3/predefined.php
This predefined variable shows the request method used to open the page, such as GET or POST.
Current value: GET
Predefined variables are variables that PHP already creates and makes available to the programmer. I do not have to create them myself before using them. They can provide useful information about the server, browser request, forms, cookies, sessions, and other parts of a webpage. Many predefined variables are also called superglobals because they can be used in different parts of a PHP script.