php - 数组排序，如何在整个数组中将键 1 更改为键 2

Question

所以我有一个像这样的数组：

//        user 1 $historia[id_usuario][id_historia]
    $historia[1][1] = '1asdfasf';
    $historia[1][8] = '1asdfasf';
    $historia[1][7] = '1asdfasf';
    $historia[1][4] = '1asdfasf';

//        user 2 $historia[id_usuario][id_historia]
    $historia[2][5] = '2asdfasf';
    $historia[2][6] = '2asdfasf';
    $historia[2][3] = '2asdfasf';
    $historia[2][2] = '2asdfasf';

我需要让它们按第二个键排序，最终结果应该是这样的：

    //person1
    $historia[1][1] = '1asdfasf';
    $historia[8][1] = '1asdfasf';
    $historia[7][1] = '1asdfasf';
    $historia[4][1] = '1asdfasf';

    //person2
    $historia[5][2] = '2asdfasf';
    $historia[6][2] = '2asdfasf';
    $historia[3][2] = '2asdfasf';
    $historia[2][2] = '2asdfasf';

接着！

    $historia[1][1] = '1asdfasf';
    $historia[2][2] = '2asdfasf';
    $historia[3][2] = '2asdfasf';
    $historia[4][1] = '1asdfasf';
    $historia[5][2] = '2asdfasf';
    $historia[6][2] = '2asdfasf';
    $historia[7][1] = '1asdfasf';
    $historia[8][1] = '1asdfasf';

我试图阅读一些数组排序脚本，但我变得非常困惑，所以我实际上需要外部帮助......你们中的任何人都可以给我一个领导吗？

谢谢！

Answer 1

$historia[1][1] = '1asdfasf';
$historia[1][8] = '1asdfasf';
$historia[1][7] = '1asdfasf';
$historia[1][4] = '1asdfasf';
$historia[2][5] = '2asdfasf';
$historia[2][6] = '2asdfasf';
$historia[2][3] = '2asdfasf';
$historia[2][2] = '2asdfasf';

$new_array=array();
foreach($historia as $uid=>$sub)
{
    foreach($sub as $hid=>$val)
    {
        if(empty($new_array[$hid])) $new_array[$hid]=array();
        $new_array[$hid][$uid]=$val;
    }
}
ksort($new_array);
print_r($new_array);

输出：

Array
(
    [1] => Array
        (
            [1] => 1asdfasf
        )

    [2] => Array
        (
            [2] => 2asdfasf
        )

    [3] => Array
        (
            [2] => 2asdfasf
        )

    [4] => Array
        (
            [1] => 1asdfasf
        )

    [5] => Array
        (
            [2] => 2asdfasf
        )

    [6] => Array
        (
            [2] => 2asdfasf
        )

    [7] => Array
        (
            [1] => 1asdfasf
        )

    [8] => Array
        (
            [1] => 1asdfasf
        )

)