vendor/topthink/framework/src/think/Pipeline.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2021 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) {