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
<?php namespace A\B\C; /* This function is A\B\C\fopen */ function fopen() { /* ... */ $f = \fopen(...); // call global fopen return $f; } ?>
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https://www.php.net/manual/en/language.namespaces.global.php