Laravel 4 - 循环访问数组并将值获取到边栏选项卡中

我正在使用etrepat/baum，并且我正在检索根类别的所有子项：

$children = $category->children()->get();

然后，为了检索存储在子类别下的所有产品，我正在执行一个 foreach 循环来获取子类别的 id，另一个 foreach 将产品存储在$children_products[]数组中，如下所示：

// store the ids of the children categories
foreach ($children as $child) {
     $children_ids[] = $child->id;
}
// store the products that children categories have
foreach($children_ids as $val) {
     $children_products[] = Product::where('category_id', '=', $val)->get();
}

然后，我将$children_products数组发送到视图以呈现结果。虽然，这是为每个具有产品或为空的子类别呈现为不同的数组。

[] [{"id":1,"category_id":21,"brand_id":1,"title":"test","description":"Etiam aliquam sem ac velit feugiat elementum. Nunc eu elit velit, nec vestibulum nibh. Curabitur ultrices, diam non ullamcorper blandit, nunc lacus ornare nisi, egestas rutrum magna est id nunc. Pellentesque imperdiet malesuada quam, et rhoncus eros auctor eu. Nullam vehicula metus ac lacus rutrum nec fermentum urna congue. Vestibulum et risus at mi ultricies sagittis quis nec ligula. Suspendisse dignissim dignissim luctus.","price":"1000.00","availability":1,"image":"img'/products'/2014-11-24-14:29:33-00064736.jpg","created_at":"2014-11-24 14:29:34","updated_at":"2014-11-24 14:29:34"}] [] [] [] [] []

有没有办法遍历这些数组并将产品存储在数组中？