unable to access variable value in foreach laravel

$categories = DB::table('categories')->select('categoryid')->get();
    foreach ($categories as $category) 
      {
         $categoryid = $category->categoryid;
         die($categoryid);
      }

after var_dump($category->categoryid); I am getting int(5)

why I am not getting value in categoryid as 5?

via Chebli Mohamed