UPLOAD上传的图片，以及UEditor里面上传的图片。如何删除。

<?php

namespace app\admin\controller;

use app\admin\model\Chanpin as ChanpinModel;

use app\admin\model\Chanpinpic as ChanpinpicModel;

use think\facade\Request;

use app\admin\controller\Common;

class Chanpinpic extends Common

{

public function chanpinpic(){

$shu = ChanpinpicModel::count();

$tu = ChanpinpicModel::all();

$this->assign('tu',$tu);

$this->assign('shu',$shu);

// dump($tu);

return $this->fetch();

}

public function chanpinpicaddd(){

$chanpinmingcheng = ChanpinModel::all();

$this->assign('chanpinmingcheng',$chanpinmingcheng);

return $this->fetch();

}

public function upload()

    {

        // 获取上传图片的信息

        $file = Request::file('file');

        // 验证图片并移动到指定目录

        if ($info = $file->validate(['ext' => 'jpg,jpeg,png,gif'])->move('upload')) {

            // 拼接图片路径

            $fileName = '/upload/' . $info->getSaveName();

            // 返回上传成功的提示信息

            return json([1, '上传成功！', 'data' => $fileName]);

        } else {

            // 返回上传失败的错误信息

            return $file->getError();

        }

    }

public function cpdoaddd(){

$data = Request::param();

        $newPic = new ChanpinpicModel();

        if ($newPic->save($data)) {

            return ['res' => 1, 'msg' => '发布成功！'];

        } else {

            return ['res' => 0, 'msg' => '发布失败！'];

        }

}

public function del()

    {

        $picId=Request::param('id');

        ChanpinpicModel::destroy($picId);

    }

}