What is the \ operator in the code?

Question

PHP

here https://github.com/ampp/mysql/blob/master/lib/Int...
strangely time() is called
for example
$this->lastDataAt = \time();
what kind of call is this or where can I find help on it on the internet? I didn’t find something in the PHP dock, I rummaged through everything about calling functions and methods

Answer 1

here