如何在PHP中更改数组的键？

我有以下数组：

array(10) {
  [0]=>
  array(2) {
    ["id"]=>
    string(2) "73"
    ["position"]=>
    string(1) "1"
  }
  [1]=>
  array(2) {
    ["id"]=>
    string(2) "58"
    ["position"]=>
    string(1) "2"
  }
  [2]=>
  array(2) {
    ["id"]=>
    string(2) "82"
    ["position"]=>
    string(1) "3"
  }
  [3]=>
  array(2) {
    ["id"]=>
    string(2) "84"
    ["position"]=>
    string(1) "4"
  }
  [4]=>
  array(2) {
    ["id"]=>
    string(2) "74"
    ["position"]=>
    string(1) "5"
  }
  [5]=>
  array(2) {
    ["id"]=>
    string(2) "59"
    ["position"]=>
    string(1) "6"
  }
  [6]=>
  array(2) {
    ["id"]=>
    string(2) "72"
    ["position"]=>
    string(1) "7"
  }
  [7]=>
  array(2) {
    ["id"]=>
    string(2) "78"
    ["position"]=>
    string(1) "7"
  }
  [8]=>
  array(2) {
    ["id"]=>
    string(2) "77"
    ["position"]=>
    string(1) "8"
  }
  [9]=>
  array(2) {
    ["id"]=>
    string(2) "71"
    ["position"]=>
    string(1) "8"
  }
}

我希望将数组的键 索引替换为位置值。输出应如下所示：

array(10) {
  [1]=>
  array(2) {
    ["id"]=>
    string(2) "73"
    ["position"]=>
    string(1) "1"
  }
  [2]=>
  array(2) {
    ["id"]=>
    string(2) "58"
    ["position"]=>
    string(1) "2"
  }
  [3]=>
  array(2) {
    ["id"]=>
    string(2) "82"
    ["position"]=>
    string(1) "3"
  }
  [4]=>
  array(2) {
    ["id"]=>
    string(2) "84"
    ["position"]=>
    string(1) "4"
  }
  [5]=>
  array(2) {
    ["id"]=>
    string(2) "74"
    ["position"]=>
    string(1) "5"
  }
  [6]=>
  array(2) {
    ["id"]=>
    string(2) "59"
    ["position"]=>
    string(1) "6"
  }
  [7]=>
  array(2) {
    ["id"]=>
    string(2) "72"
    ["position"]=>
    string(1) "7"
  }
  [7]=>
  array(2) {
    ["id"]=>
    string(2) "78"
    ["position"]=>
    string(1) "7"
  }
  [8]=>
  array(2) {
    ["id"]=>
    string(2) "77"
    ["position"]=>
    string(1) "8"
  }
  [8]=>
  array(2) {
    ["id"]=>
    string(2) "71"
    ["position"]=>
    string(1) "8"
  }
}

我尝试了下面的代码，但它只在数组中打印一个元素：

$newarr = array();

$values = $this->request->get( 'values', null );

foreach ($values as $oldkey => $value) {
    $position = $value["position"];
    $newarr[$position] = $values[$oldkey];
    $values=$newarr;
    unset($newarr);
}
var_dump($values);exit;

的var_dump结果$values为

<br />
<b>Notice</b>:  Undefined offset: 8 in ResourcesController.php</b> 
<b>Notice</b>:  Undefined offset: 9 in ResourcesController.php</b> on line <b>367</b><br />
array(1) {
  [8]=>
  NULL
}`