Predefined Variables

In PHP, predefined variables are variables that are already defined by the server and can be used in any script without needing to declare them explicitly. Two examples of predefined variables are $_SERVER['PHP_SELF'] and $_SERVER['SERVER_NAME'].

Example 1: The current script file is: /assignment3/predefined.php

Example 2: The server name is: mail.ibeecher.soisweb.uwm.edu

These predefined variables provide information about the current script file and server environment, making them useful for various tasks such as form handling, URL generation, and server-related configurations.