使用PHP多个条件排序数组 [英] Sort array using multiple criteria in PHP

问题描述

我知道大约有多个标准分拣一些其他的话题，但他们没有解决我的问题。
比方说，我有这样的数组：

I know there are some other topics about sorting with multiple criteria, but they don't fix my problem. Let's say I have this array:

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
        )

)

我要对它进行排序，把一个在顶部的最高得分。在同样的比分，我想一个在顶部的最低数量残局。
排序mechanisme应该前列用户1，用户2话，那么4，然后用户3。

I want to sort it, putting the one with the HIGHEST score on top. On same score, I want the one with the LOWEST endgame number on top. The sorting mechanisme should rank user1 on top, then user2, then 4 and then user3.

我用这个排序mechanisme：

I use this sorting mechanisme:

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");

这给了我下面的数组：

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，阵列没有适当的排序...任何人都知道我做错了什么？非常感谢！

As you can see, the array isn't sorted properly... Anyone knows what I'm doing wrong? Thanks a lot!

推荐答案

您函数应该是这样的：

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;
}

试试吧。它会给你带来这样的：

Try it out. It will give you result like this:

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
    )

)

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