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 global constants reside. When a variable, function, or constant is defined without specifying a namespace, it is stored in the the global space.
It is recommended to avoid using the global space for any definition: they should be stored in a custom namespace. Then, they may be imported in other namespaces, with the use expression.
<?php
// This is the global space
namespace {
// this function is defined in the global space
function foo() {}
}
?>
