Call to a member function randomNumber() on int

  at D:\Edowork\colone\eduwork-laravel-vue\library\database\seeders\BookSeeder.php:22

     18▕     {

     19▕         $faker = Faker::create();

     20▕         for ($i = 0; $i < 50; $i++) {

     21▕             $book = new Book;

  ➜  22▕             $book->isbn = $faker->randomNumber(9);

     23▕             $book->title = $faker->title;

     24▕             $book->year = $faker = rand(2010, 2023);

     25▕ 

     26▕             $book->publisher_id = rand(1, 20);

  1   D:\Edowork\colone\eduwork-laravel-vue\library\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:36

      Database\Seeders\BookSeeder::run()

  2   D:\Edowork\colone\eduwork-laravel-vue\library\vendor\laravel\framework\src\Illuminate\Container\Util.php:40     

      Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()

PS D:\Edowork\colone\eduwork-laravel-vue\library>