PHP array_multisort 没有正确排序第二个数组

Question

这是我的代码:

$numbers = array(10, 100, 100, 0);
$names = array("Alex", "Jane", "Amanda", "Debra");
array_multisort($numbers, $names);

print_r($numbers);
print_r($names);

以上代码输出:

Array
(
  [0] => 0
  [1] => 10
  [2] => 100
  [3] => 100
)

Array
(
  [0] => Debra
  [1] => Alex
  [2] => Amanda
  [3] => Jane
)

为什么第二个数组的排序不正确？如果它是正确的，谁能解释它是如何正确的？

谢谢。

Answer 1

是的，这是正确的。您以错误的方式使用了 PHP 的“array_multisort”函数。它不会对两个数组进行排序，但会对第一个数组进行排序，第二个数组将按照与第一个数组相对应的顺序进行定位。

$numbers 排序前:

(
  [0] => 10
  [1] => 100
  [2] => 100
  [3] => 0
)

排序后:

(
  [0] => 0 (position before sorting - 3rd)
  [1] => 10 (position before sorting - 0)
  [2] => 100 (position before sorting - 2 or 1)
  [3] => 100 (position before sorting - 2 or 1)
)

因此，第二个数组不会排序，但会根据第一个数组定位其元素。

(
  [0] => Debra --in first array 3rd element has moved to 0th position
  [1] => Alex -- in first array 0th element has moved to 1st position
  [2] => Amanda -- in first array 2nd element has moved to 2nd position
  [3] => Jane -- in first array 1st element has moved to 3rd position
)