think\process\pipes\Windows::write PHP Метод

    private function write($blocking, $close)
    {
        if (empty($this->pipes)) {
            return;
        }
        $this->unblock();
        $r = null !== $this->input ? ['input' => $this->input] : null;
        $w = isset($this->pipes[0]) ? [$this->pipes[0]] : null;
        $e = null;
        if (false === ($n = @stream_select($r, $w, $e, 0, $blocking ? Process::TIMEOUT_PRECISION * 1000000.0 : 0))) {
            if (!$this->hasSystemCallBeenInterrupted()) {
                $this->pipes = [];
            }
            return;
        }
        if (0 === $n) {
            return;
        }
        if (null !== $w && 0 < count($r)) {
            $data = '';
            while ($dataread = fread($r['input'], self::CHUNK_SIZE)) {
                $data .= $dataread;
            }
            $this->inputBuffer .= $data;
            if (false === $data || true === $close && feof($r['input']) && '' === $data) {
                $this->input = null;
            }
        }
        if (null !== $w && 0 < count($w)) {
            while (strlen($this->inputBuffer)) {
                $written = fwrite($w[0], $this->inputBuffer, 2 << 18);
                if ($written > 0) {
                    $this->inputBuffer = (string) substr($this->inputBuffer, $written);
                } else {
                    break;
                }
            }
        }
        if ('' === $this->inputBuffer && null === $this->input && isset($this->pipes[0])) {
            fclose($this->pipes[0]);
            unset($this->pipes[0]);
        }
    }