Laravel-admin form 表单提交的数据怎么来序列化处理

            //保存前回调
            $form->saving(function (Form $form) {
                 $array = [
                    'logo' => $form->logo,
                    'icon' => $form->icon,
                    'website' => $form->website,
                    'keywords' => $form->keywords,
                    'description' => $form->description,
                 ];

                 $data = [
                     'content' => serialize($data),
                 ];
                 return $data;
            });

该怎么来写这段操作？