дерево категории LARAVEL \ the categories tree LARAVEL

gistfile1.php

$categorys = DB::table('category')
            ->orderBy('title', 'asc')
            ->get();
        $tree = array();
        foreach ($categorys as $row) {
            $tree[(int)$row->parent_id][] = $row;
        }

        $traverse = function($tree, $prefix = '-', $pid=0)  use (&$traverse) {
            if (empty($tree[$pid]))
                return;
            foreach ($tree[$pid] as $k => $row) {
                echo PHP_EOL.$prefix.' '.$row->title;
                if (isset($tree[$row->id]))
                    $traverse($tree, $prefix.'-', $row->id );
            }

        };

        $traverse($tree);