Thruway\Procedure::getNextRandomRegistration PHP Method

    private function getNextRandomRegistration()
    {
        if (count($this->registrations) === 1) {
            //just return this so that we don't have to run mt_rand
            return $this->registrations[0];
        }
        //mt_rand is apparently faster than array_rand(which uses the libc generator)
        return $this->registrations[mt_rand(0, count($this->registrations) - 1)];
    }