Predefined

This shows the I.P address of the server that the server is running under: 129.89.43.13
The line above is using the $_SERVER['SERVER_ADDR'] to retrieve the I.P. address from the server.

This is the name of the server: touavue.soisweb.uwm.edu
The line above is using the $_SERVER['SERVER_NAME'] to retrieve the name of the server host. This defaults to the URL of the website.