Global Space¶
The term “global space” refers to the global namespace “" or the top-level scope in the PHP language. The global space is where global variables, functions, and constants reside. When you define a variable, function, or constant without specifying a namespace, it belongs to the global space.
It is recommended to avoid using the global space for any definition: they should be stored in a custom namespace.
<?php
// This is the global space
namespace {}
?>