readPipes example

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);
        }

        do {
            $this->checkTimeout();
            $running = $this->isRunning() && ('\\' === \DIRECTORY_SEPARATOR || $this->processPipes->areOpen());
            $this->readPipes($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
        } while ($running);

        while ($this->isRunning()) {
            $this->checkTimeout();
            usleep(1000);
        }

        if ($this->processInformation['signaled'] && $this->processInformation['termsig'] !== $this->latestSignal) {
            throw new ProcessSignaledException($this);
        }

        

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);
        }

        do {
            $this->checkTimeout();
            $running = $this->isRunning() && ('\\' === \DIRECTORY_SEPARATOR || $this->processPipes->areOpen());
            $this->readPipes($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
        } while ($running);

        while ($this->isRunning()) {
            $this->checkTimeout();
            usleep(1000);
        }

        if ($this->processInformation['signaled'] && $this->processInformation['termsig'] !== $this->latestSignal) {
            throw new ProcessSignaledException($this);
        }