@php
$cities = \App\Module\Db\Location::getInstance()->getCities();
$cityIds = old('city_id', $promotion->location_ids ?? []);
@endphp
<div class="form-group">
    <label for="city_id">{{trans('admin::order.location.label')}}:</label>
    <div class="select2-lg">
        <select name="city_ids[]" id="city_id" class="form-control form-control-lg select2" style="width:100%" multiple data-placeholder="{{trans('admin::message.select')}}">
            @if(isset($cities) && is_array($cities) && count($cities) > 0)
                @foreach($cities as $elem)
                    <option value="{{$elem->id}}" @if(array_search($elem->id,$cityIds) !== false){{'selected'}}@endif >{{$elem->name}}</option>
                @endforeach
            @endif
        <select>
    </div>
</div>