Php 将Laravel集合选择默认输入设置为禁用

我的PostController.php的一部分

    <?php

    namespace App\Http\Controllers;

    use Illuminate\Http\Request;
    use Session;
    use Carbon\Carbon;

    use App\Category;
    use App\Post;
    use App\Tag;
    use App\User;


    class PostController extends Controller
    {
    public function create()
      {
        $categories = Category::pluck('name','id');
        $tags = Tag::pluck('name','id');

        return view('posts.create')->withCategories($categories)->withTags($tags); 
      }

 <div class="input-field col m6 s12">
   {!! Form::select('category', $categories, null, ['class' => 'validate', 'placeholder' => 'test']) !!}
   {{ Form::label('category', 'Category: ') }}
 </div> 

---

您可以自己创建占位符：

{!! Form::select('category', ['' => 'Select your category'] + $categories->all(), null,
    ['class' => 'validate'], ['' => ['disabled']]) !!}