gistfile1.txt

    /**
     * Crazy tree building
     *
     * @param \Illuminate\Support\Collection $folders
     *
     * @return array
     */
    public function createTree(\Illuminate\Support\Collection $folders)
    {
        $folders = $folders->toArray();
        krsort($folders);
        foreach ($folders as $folder) {
            /** @var Folder $item */
            $item      = array_shift($folders);
            $delimiter = $item->getDelimiter();
            $a = explode($delimiter, $item->getName());
            array_pop($a);
            $parent = implode($delimiter, $a);
            if (array_key_exists($parent, $folders)) {
                /** @var Folder[] $folders */
                $folders[$parent]->addChild($this->transformFolder($item));
            } else {
                $folders[] = $this->transformFolder($item);
            }
        }
        return collect($folders)->toArray();
    }