PHP如何用1个或多个键创建一个新的多维数组是一样的？

Question

我有以下多维数组

if($this->conn->row_count($sql)==true){
    while($row=$statement->fetch()){
        $problems[]=[
                    'order_id'=>$row['order_id'],
                    'details'=>['remark'=>$row['remark'],'date'=>$row['date']]
                    ];
    }
    return $problems;
}

然后我打印出来

echo '<pre>',print_r($problems),'</pre>';

结果

Array
(
    [0] => Array
        (
            [order_id] => 4683
            [details] => Array
                (
                    [remark] => happy
                    [date] => 2018-06-09---10:16:41am
                )

        )

    [1] => Array
        (
            [order_id] => 4683
            [details] => Array
                (
                    [remark] => unhappy
                    [date] => 2018-06-10---03:29:00am
                )

        )

    [2] => Array
        (
            [order_id] => 4440
            [details] => Array
                (
                    [remark] => very unhappy
                    [date] => 2018-06-10---03:34:00am
                )

        )

)   

我正在尝试将它们分组到一个新的多维数组中，如果相同的order_id和连接细节。 order_id可能有2个以上，因为此order_id可能会有更多评论 *，就像下面的

一样

Array
(
    [0] => Array
        (
            [order_id] => 4683
            [details] => Array
                (
                    [remark] => happy
                    [date] => 2018-06-09---10:16:41am
                ),
                (
                    [remark] => unhappy
                    [date] => 2018-06-10---03:29:00am
                )

        )

    [1] => Array
        (
            [order_id] => 4440
            [details] => Array
                (
                    [remark] => very unhappy
                    [date] => 2018-06-10---03:34:00am
                )

        )

)   

要获得更清晰的图片，请查看截图

知道如何像输出那样创建一个新数组吗？

Answer 1

您可以通过关联数组对其进行分组。您可以使用array_values将关联数组转换为简单数组。

$problems = [];
if($this->conn->row_count($sql)==true){
    while($row=$statement->fetch()){
        if ( !isset( $problems[ $row['order_id'] ] ) ) {
            $problems[ $row['order_id'] ] = [
                'order_id' => $row['order_id'],
                'details' => []
            ];
        }
        $problems[ $row['order_id'] ]['details'][] = ['remark'=>$row['remark'],'date'=>$row['date']];
    }
    return array_values( $problems );
}