如何在PHP中正确映射此类数据？

Question

我有id的字符串："1,2,3,4".我需要得到数组：

1 => Post::whereId(1)->get()->created_at
2 => Post::whereId(2)->get()->created_at
3 => Post::whereId(3)->get()->created_at
4 => Post::whereId(4)->get()->created_at

我试试这个：

$postMap = collect($item->posts_id)->mapWithKeys(function ($item) {
            return [
                $item->posts_id => Post::whereId($item->postss_id)->first()->crated_at,
            ];
        });

Answer 1

只需像这样使用pluck()方法：

$array = Post::whereIn('id', explode(',', $arrayString))->pluck('created_at', 'id');