fastadmin 使用 topthink/img 压缩、裁剪、加水印、处理图片

1、安装

composer require topthink/think-image

2、使用（application/admin/controller/Ajax.php）

在fastadmin中上传文件的公用方法中使用
思路：可以添加上传参数type，系统会根据type选择不同的方式处理图片

         $new_file_name = '';
        if (in_array($fileInfo['type'], ['image/gif', 'image/jpg', 'image/jpeg', 'image/bmp', 'image/png', 'image/webp']) || in_array($suffix, ['gif', 'jpg', 'jpeg', 'bmp', 'png', 'webp'])) {

            $image = \think\Image::open(request()->file('file'));
            $scene_type = request()->post('type');
            $new_file_name = $this->buildSaveName($fileName);
            switch ($scene_type){
                case 'product_thumb' :
                    $splInfo = $image->thumb(200, 200)->save('.' . $uploadDir . $new_file_name);
                    break;
                case 'product_img' :
                    $splInfo = $image->thumb(750, 750)->save('.' . $uploadDir . $new_file_name);
                    break;
                case 'product_detail_img' :
                    $splInfo = $image->save('.' . $uploadDir . $new_file_name);
                    break;
                default:
                    $splInfo = $image->save('.' . $uploadDir . $new_file_name, null, 80);
                    break;
            }

        }else{
            $splInfo = $file->validate(['size' => $size])->move(ROOT_PATH . '/public' . $uploadDir, $fileName);
        }

3、其他使用
https://www.kancloud.cn/manual/thinkphp5/177530