laravel 管道模式的应用

public function index2(){
        $pipe1 = function ($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);
        $data = 0;

        $pipeline = new Pipeline();

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