vendor/topthink/framework/src/think/route/dispatch/Callback.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: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\route\dispatch;

use think\route\Dispatch;

/**
 * Callback Dispatcher
 */
class Callback extends Dispatch
{
    public function exec()
    {
        // 执行回调方法
        $vars = array_merge($this->request->param(), $this->param);

        return $this->app->invoke($this->dispatch, $vars);
    }

}