使用PHP中的多个条件对数组进行排序

Question

我知道有一些关于使用多个条件进行排序的其他主题,但它们并不能解决我的问题.假设我有这个数组:

Array
(
    [0] => Array
        (
            [uid] => 1
            [score] => 9
            [endgame] => 2
        )

    [1] => Array
        (
            [uid] => 2
            [score] => 4
            [endgame] => 1
        )

    [2] => Array
        (
            [uid] => 3
            [score] => 4
            [endgame] => 100
        )

    [3] => Array
        (
            [uid] => 4
            [score] => 4
            [endgame] => 70
        )

)

我想对它进行排序,将最高分的那个放在最前面.在同样的分数上,我想要一个最低端赛号码的人.排序机制应该将user1排在最前面,然后是user2,然后是4,然后是user3.

我使用这种排序机制:

function order_by_score_endgame($a, $b)
{
  if ($a['score'] == $b['score'])
  {
    // score is the same, sort by endgame
    if ($a['endgame'] == $b['endgame']) return 0;
    return $a['endgame'] == 'y' ? -1 : 1;
  }

  // sort the higher score first:
  return $a['score'] < $b['score'] ? 1 : -1;
}
usort($dummy, "order_by_score_endgame");

这给了我以下数组:

Array
(
    [0] => Array
        (
            [uid] => 1
            [score] => 9
            [endgame] => 2
        )

    [1] => Array
        (
            [uid] => 3
            [score] => 4
            [endgame] => 100
        )

    [2] => Array
        (
            [uid] => 2
            [score] => 4
            [endgame] => 1
        )

    [3] => Array
        (
            [uid] => 4
            [score] => 4
            [endgame] => 70
        )

)

正如你所看到的,阵列没有正确排序......任何人都知道我做错了什么？非常感谢!

Answer 1

你的功能应该是这样的:

function order_by_score_endgame($a, $b){
if ($a['score'] == $b['score'])
    {
      // score is the same, sort by endgame
      if ($a['endgame'] > $b['endgame']) return 1;
    }
    // sort the higher score first:
    return $a['score'] < $b['score'] ? 1 : -1;
}

试试看.它会给你这样的结果:

Array
(
[0] => Array
    (
        [uid] => 1
        [score] => 9
        [endgame] => 2
    )

[1] => Array
    (
        [uid] => 2
        [score] => 4
        [endgame] => 1
    )

[2] => Array
    (
        [uid] => 4
        [score] => 4
        [endgame] => 70
    )

[3] => Array
    (
        [uid] => 3
        [score] => 4
        [endgame] => 100
    )

)