the server host is mail.will2784.soisweb.uwm.edu
local and global variable test
This is the global text This is global
This is the local text This is local
$var is still global with &GLOBALS["var"]. This is global
$var is local with only $var. This is local

predefined variables are just variables PHP already has, some are only read such as the _SERVER, these contain default information, some can be written to and need to be written first such as the GLOBALS, globals is a predefined library of all variables defined globally. Obviously if one hasn't been defined yet the predefined variable library will be empty.