requireProcessIsStarted example

    public function wait(callable $callback = null): int
    {
        $this->requireProcessIsStarted(__FUNCTION__);

        $this->updateStatus(false);

        if (null !== $callback) {
            if (!$this->processPipes->haveReadSupport()) {
                $this->stop(0);
                throw new LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::wait".');
            }
            $this->callback = $this->buildCallback($callback);
        }

        

    public function wait(callable $callback = null): int
    {
        $this->requireProcessIsStarted(__FUNCTION__);

        $this->updateStatus(false);

        if (null !== $callback) {
            if (!$this->processPipes->haveReadSupport()) {
                $this->stop(0);
                throw new LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::wait".');
            }
            $this->callback = $this->buildCallback($callback);
        }