通过引用更改 PHP 多维数组中的值

Question

使用函数通过引用更改 PHP 多维数组中的值 我想将所有 0 值更改为 1 到 6 之间的随机数

我使用 $_SESSION 来保存骰子卷

1. 数组是 $_SESSION 数组在播放过程中的样子
2. 当玩家保存一个骰子时，后端脚本将骰子更改为 0
3. 我需要将0更改为1到6之间的随机数

/*MY ARRAY LOOKS LIKE THIS
Array
(
    [0] => Array
        (
            [save_1] => Array
                (
                    [pos1] => 0
                    [pos2] => 2
                    [pos3] => 0
                    [pos4] => 0
                    [pos5] => 3
                    [pos6] => 0
                )

        )

    [1] => Array
        (
            [save_2] => Array
                (
                    [pos1] => 0
                    [pos2] => 6
                    [pos3] => 0
                    [pos4] => 5
                    [pos5] => 1
                    [pos6] => 0
                )

        )

    [2] => Array
        (
            [save_3] => Array
                (
                    [pos1] => 2
                    [pos2] => 0
                    [pos3] => 5
                    [pos4] => 0
                    [pos5] => 2
                    [pos6] => 2
                )

        )

    [3] => Array
        (
            [save_4] => Array
                (
                    [pos1] => 0
                    [pos2] => 6
                    [pos3] => 6
                    [pos4] => 5
                    [pos5] => 5
                    [pos6] => 0
                )

        )

    [4] => Array
        (
            [save_5] => Array
                (
                    [pos1] => 2
                    [pos2] => 0
                    [pos3] => 4
                    [pos4] => 4
                    [pos5] => 0
                    [pos6] => 0
                )

        )

    [5] => Array
        (
            [save_6] => Array
                (
                    [pos1] => 3
                    [pos2] => 0
                    [pos3] => 4
                    [pos4] => 0
                    [pos5] => 5
                    [pos6] => 5
                )

        )

)
*/
//I TRIED THIS

function foo(&$var) {
  foreach ($var as $key) {
    foreach ($var as $key) {
      foreach ($var as $key => $value) {
        $value = mt_rand(1,6);
      }
    }
  }
}
unset($var); // break the reference

foo($diceRoll);