经常在代码中我们需要实现数组排序，或者数组过滤，或者数组查找类似查找 数据库 一样的用法

可以使用collect

        $items=[
            ["num"=>17,"status"=>0,"grade"=>5],
            ["num"=>17,"status"=>2,"grade"=>4],
            ["num"=>7,"status"=>1,"grade"=>6],
            ["num"=>17,"status"=>0,"grade"=>3],
        $ucsCollect=collect($items);
        $ucsCollect=$ucsCollect->filter(function ($item, $key) {
            return $item['num'] > 14;
        //倒叙排序
        $ucsList=$ucsCollect->sortByDesc(function ($item, $key) {