mgsmus abi dediğin gibi yaptım yine en son tabda ne işaretlediysem o geliyor
<form action="{{route('personal.create.post')}}" method="post" >
{{csrf_field()}}
<ul class="nav nav-tabs mb-3">
@foreach (range(1,3) as $item)
<li class="nav-item">
<a class="nav-link @if ($loop->first) active @endif" data-toggle="pill"
href="#{{ $item.'-day' }}">{{ $item.'-day'}}</a>
</li>
@endforeach
<li class="nav-item">
<a class="nav-link" data-toggle="pill" href="#general">General</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
@foreach (range(1,3) as $item)
<input type="hidden" value="{{$item}}" name="days[]">
<div class="tab-pane @if ($loop->first) active @endif" id="{{ $item.'-day' }}">
<div class="form-group">
<label for="exampleFormControlSelect2">Example multiple select</label>
<select class="form-control" id="exampleFormControlSelect2" multiple="" name="tags[]">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
</div>
</div>
@endforeach
<div class="tab-pane fade" id="general" role="tabpanel" aria-labelledby="nav-contact-tab">
<div class="form-group">
<label for="title">Title</label>
<input type="text" class="form-control" name="titl">
</div>
</div>
</div>
<button class="btn btn-primary " type="submit">Create</button>
</form>