Uuid::getV4

static function getV4(): string
{
	return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
		random_int(0, 0xffff),
		random_int(0, 0xffff),
		random_int(0, 0xffff),
		random_int(0, 0x0fff) | 0x4000,
		random_int(0, 0x3fff) | 0x8000,
		random_int(0, 0xffff),
		random_int(0, 0xffff),
		random_int(0, 0xffff)
	);
}