关于TP5模板输出时间戳问题--A non well formed numeric value encountered

 1 /**
 2    * get admin/Picture/index
 3    * 显示所有图册信息
 4    * @return view
 5    */
 6     public function index()
 7     {
 8         $data = $this->model->getAllPicture();
 9        
10         // dump($data);
11         $this->assign(‘data‘,$data);
12         return view();
13     }

1 /**
2   *  取得所有
3   */
4   public function getAllPicture(){
5       return Cache::tag(‘admin_cache_data‘)->remember(‘cache_picture‘,function(){
6             return Db(‘picture‘)->field(‘id,category_id,title,tags,download_count,picture_cover_url,preview_count,picture_details_id,status,update_time,sort‘)->select();
7       });
8   }