Php/docs/language.namespaces.global
From Get docs
Global space
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
Without any namespace definition, all class and function definitions are
placed into the global space - as it was in PHP before namespaces were
supported. Prefixing a name with \ will specify that
the name is required from the global space even in the context of the
namespace.
Example #1 Using global space specification
<?phpnamespace A\B\C;/* This function is A\B\C\fopen */function fopen() { /* ... */ $f = \fopen(...); // call global fopen return $f;} ?>
