将第二个查询结果作为关联数组推送到从fetch_assoc获取的现有数据中的问题

我试图合并两个SQL查询结果,而第一个查询总是返回一行,第二个查询可能返回0到多行。我用PHP将第一个查询结果加载到一个数组中,如

$data = [];
while($row = $result->fetch_assoc()) {
  $data=$row;
}

while($rowtwo = $resulttwo->fetch_assoc()) {
  array_push($data, array('per' => $row['per'],
'duration' => $row['duration']));
}

输出为 print_r() 看起来像

Array
(
    [term] => 0
    [available] => 1
    [0] => Array
        (
            [per] => 2019-09-04
            [duration] => 14
        )

    [1] => Array
        (
            [per] => 2019-09-04
            [duration] => 15
        )

    [2] => Array
        (
            [per] => 2019-09-04
            [duration] => 15-30
        )

    [3] => Array
        (
            [per] => 2019-09-04
            [duration] => 16
        )
)   

但我需要将第二个查询作为数组存储在数组中,如

Array
(
    [term] => 0
    [available] => 1
    [newarray] = [
            [0] => Array
                (
                    [per] => 2019-09-04
                    [duration] => 14
                )

            [1] => Array
                (
                    [per] => 2019-09-04
                    [duration] => 15
                )

            [2] => Array
                (
                    [per] => 2019-09-04
                    [duration] => 15-30
                )

            [3] => Array
                (
                    [per] => 2019-09-04
                    [duration] => 16
        )
        ]
)