reverseNested

gistfile1.txt

use Illuminate\Support\Collection;
Collection::macro('reverseNested', function ($childrenField,$parents=[]) {
    $result = collect();

    foreach ($this->items as $item) {

        if ($item->$childrenField) {
            $parents[] = $item->name;
            $subCategories = collect($item->$childrenField)->map(function($cat) use ($parents){
                $cat->parents = $parents;
                return $cat;
            });
            unset($item->$childrenField);
            $result = $result->merge($subCategories->reverseNested($childrenField,$parents));
        } else {
            unset($item->$childrenField);
            $result->push($item);
        }
    }
    return $result;
});


// Usage

$categories = collect($categories);
$reverseCategories = $categories->reverseNested('subCategories');
dd($reverseCategories);