<ul>
    @php($inactive = 'style="color: red;"')
    @foreach($childs as $child)
        <li {!! ($child->category_is_exist == 0) ? $inactive : '' !!}>
            {{ $child->category_name }}
            {!! Form::radio('tree_id',$child->category_id , isset($product) ? (($product->category_id == $child->category_id) ? true : false) : false, ['data' => $child->category_name] ) !!}
            @if(count($child->childs))
                @include('admin.category.child',['childs' => $child->childs])
            @endif
        </li>
    @endforeach
</ul>