Laravel参数化中间件深入潜水

public function then(closure $destination)
    {
        $pipeline = array_reduce(
            array_reverse($this->pipes()), $this->carry(), $this->preparedestination($destination)
        );

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

} elseif (! is_object($pipe)) {
                        [$name, $parameters] = $this->parsepipestring($pipe);

                        // if the pipe is a string we will parse the string and resolve the class out
                        // of the dependency injection container. we can then build a callable and
                        // execute the pipe function giving in the parameters that are required.
                        $pipe = $this->getcontainer()->make($name);

                        $parameters = array_merge([$passable, $stack], $parameters);
                    }

protected function parsepipestring($pipe)
    {
        [$name, $parameters] = array_pad(explode(':', $pipe, 2), 2, []);

        if (is_string($parameters)) {
            $parameters = explode(',', $parameters);
        }

        return [$name, $parameters];
    }

final readonly class pipelineclass {
   public function __constructor(public string $class, public mixed $options) {
      $this->validate($class);
   }

   private function validate(string $class) {
      if(!is_callable($class)) {
         throw new \exception("$class is not callable.");
      }    
   }
}

if (is_callable($pipe)) {
// code
} elseif (! is_object($pipe)) {
// code
} else {
// code
}

if($pipe instanceof PipelineClass){
// code
} elseif (is_callable($pipe)) {
// code
} elseif (is_string($pipe)) {
// code
} else {
// code
}