recursive tree

function categoryTree($id)
             {
            $data='';
            $all_childs = \App\Models\Category::where('parent_id', $id)->get();
            if(!empty($all_childs))
            {

                echo "<ul>";
                foreach ($all_childs as $child)
                {
                    echo "<li> <a href='#'>";
                    echo $child->name .' '. $child->id ;
                    echo "</a></li>";
                    categoryTree($child->id);
                }
                echo "</ul>";
            }


             }