記事のタグをselect multipleで

↓新規投稿画面

<select multiple class="form-control border-success" id="exampleFormControlSelect2" name="tags[]">
    @foreach($tags as $tag)
        <option value="{{$tag->id}}"
                @if(in_array($tag->id, (array)old('tags'))) selected @endif>{{$tag->name}}</option>
    @endforeach
</select>
@if ($errors->has('tags'))
    <span class="text-danger">{{$errors->first('tags')}}</span>
@endif

                {{Form::select('tags[]', $tags->pluck('name','id'), null, ['multiple' => true, 'class' => 'form-control border-success', 'id' => 'tag'])}}
                @if ($errors->has('tags'))
                    <span class="text-danger">{{$errors->first('tags')}}</span>
                @endif

↓記事編集画面

<select multiple class="form-control border-success" id="exampleFormControlSelect2" name="tags[]">
                        @foreach($tags as $tag)
                            <option value="{{$tag->id}}"
                                    @if(in_array($tag->id , ($articles->tags->pluck('id')->all())) || in_array($tag->id, (array)old('tags')))  selected @endif>{{$tag->name}}</option>
                        @endforeach
                    </select>
                    @if ($errors->has('tags'))
                        <span class="text-danger">{{$errors->first('tags')}}</span>
                    @endif

                {{Form::select('tags[]', $tags->pluck('name','id'), $articles->tags, ['multiple' => true, 'class' => 'form-control border-success', 'id' => 'tag']) }}
                @if ($errors->has('tags'))
                    <span class="text-danger">{{$errors->first('tags')}}</span>
                @endif