gulp.task('css', function(){
 return gulp.src('client/templates/*.less')
  .pipe(less())
  .pipe(minifyCSS())
  .pipe(gulp.dest('build/css'))
});

gulp.task('js', function(){
 return gulp.src('client/javascript/*.js')
  .pipe(sourcemaps.init())
  .pipe(concat('app.min.js'))
  .pipe(sourcemaps.write())
  .pipe(gulp.dest('build/js'))
});

gulp.task('default', [ 'html', 'css', 'js' ]);

public function demo(Request $request)
{
  $pipe1 = function ($payload, Closure $next) {
    $payload = $payload + 1;
    return $next($payload);
  };

  $pipe2 = function ($payload, Closure $next) {
    $payload = $payload * 3;
    return $next($payload);
  };

  $data = $request->input('data', 0);

  $pipeline = new Pipeline();

  return $pipeline
    ->send($data)
    ->through([$pipe1, $pipe2])
    ->then(function ($data) {
      return $data;
    });
}

composer require league/pipeline

use League\Pipeline\Pipeline;

class TimesTwoStage
{
  public function __invoke($payload)
  {
    return $payload * 2;
  }
}

class AddOneStage
{
  public function __invoke($payload)
  {
    return $payload + 1;
  }
}

$pipeline = (new Pipeline)
  ->pipe(new TimesTwoStage)
  ->pipe(new AddOneStage);

// Returns 21
$pipeline->process(10);

<"text-align: center">

我们再次访问的时候就变成

当然这是很简单的中间件，这种中间件远远不够，这里是核心代码，可以去这里看看，也比较简单。
我们最终需要修改pipe这个方法


namespace League\Pipeline;

class Pipeline implements PipelineInterface
{
  /**
   * @var callable[]
   */
  private $stages = [];

  /**
   * @var ProcessorInterface
   */
  private $processor;

  public function __construct(ProcessorInterface $processor = null, callable ...$stages)
  {
    $this->processor = $processor "htmlcode">

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------
namespace think;

use Closure;
use Exception;
use Throwable;

class Pipeline
{
  protected $passable;

  protected $pipes = [];

  protected $exceptionHandler;

  /**
   * 初始数据
   * @param $passable
   * @return $this
   */
  public function send($passable)
  {
    $this->passable = $passable;
    return $this;
  }

  /**
   * 调用栈
   * @param $pipes
   * @return $this
   */
  public function through($pipes)
  {
    $this->pipes = is_array($pipes) ? $pipes : func_get_args();
    return $this;
  }

  /**
   * 执行
   * @param Closure $destination
   * @return mixed
   */
  public function then(Closure $destination)
  {
    $pipeline = array_reduce(
      array_reverse($this->pipes),
      $this->carry(),
      function ($passable) use ($destination) {
        try {
          return $destination($passable);
        } catch (Throwable | Exception $e) {
          return $this->handleException($passable, $e);
        }
      });

    return $pipeline($this->passable);
  }

  /**
   * 设置异常处理器
   * @param callable $handler
   * @return $this
   */
  public function whenException($handler)
  {
    $this->exceptionHandler = $handler;
    return $this;
  }

  protected function carry()
  {
    return function ($stack, $pipe) {
      return function ($passable) use ($stack, $pipe) {
        try {
          return $pipe($passable, $stack);
        } catch (Throwable | Exception $e) {
          return $this->handleException($passable, $e);
        }
      };
    };
  }

  /**
   * 异常处理
   * @param $passable
   * @param $e
   * @return mixed
   */
  protected function handleException($passable, Throwable $e)
  {
    if ($this->exceptionHandler) {
      return call_user_func($this->exceptionHandler, $passable, $e);
    }
    throw $e;
  }
}


这种写法有什么好？
其实就好就好在，你在处理一个请求的过程中，分配任务的时候，在处理的过程，每个中间的人，只要做自己处理的请求和结果还有请求即可。让当数据到达Controller里的时候，显示业务逻辑的时候更加强大