如何在PHP中有着一个稳定的排序与arsort（）？ [英] How to have a stable sort in PHP with arsort()?

问题描述

我需要进行排序PHP中的数组基于价值，数组用于键和值的一些数字，例如像这样的：

  $ a =阵列（70 =大于1，82 =大于5，61 =＆GT; 3，55 =大于1，34 =＆GT; 2，53 =＆GT 2，21 =→4，13 =大于5）;
 

我喜欢这样的顺序来排序

 阵列
（
    [82] =＆GT;五
    [13] =＆GT;五
    [21] =＆GT; 4
    [61] =＆GT; 3
    [34] =＆GT; 2
    [53] =＆GT; 2
    [70] =＆GT; 1
    [55] =＆GT; 1
）
 

我用 arsort 和它的工作，但有一个问题，因为此功能进行改变defult分类键并排序数组：

 阵列
（
    [13] =＆GT;五
    [82] =＆GT;五
    [21] =＆GT; 4
    [61] =＆GT; 3
    [53] =＆GT; 2
    [34] =＆GT; 2
    [55] =＆GT; 1
    [70] =＆GT; 1
）
 

解决方案

构造一个新的数组，其元素是原数组的键，值也的位置是：

  $ TEMP =阵列（）;
$ I = 0;
的foreach（$数组$关键=＆GT; $值）{
  $温度[] =阵列（$ I，$键，$值）;
  $ I ++;
}
 

然后排序使用用户定义的顺序，是以原来的位置考虑：

  uasort（$温度，功能（$ A，$ B）{
 返回$一个[2] == $ B [2]？ （$一个[0]≥$ B [0]）：（$一个[2]所述; $ B [2] 1：α-1）;
}）;
 

最后，将其转换回原始关联数组：

  $阵列=阵列（）;
的foreach（$温度为$ VAL）{
  $阵列[$ VAL [1] = $ VAL [2];
}
 

i need to sort an array in php based on value, array use some numbers for keys and values, for example like this:

$a = array(70 => 1 ,82 => 5  ,61 => 3 ,55 => 1 ,34 => 2 ,53 => 2 ,21 => 4 ,13 => 5);

i like to sort it like this:

Array
(
    [82] => 5
    [13] => 5
    [21] => 4
    [61] => 3
    [34] => 2
    [53] => 2
    [70] => 1
    [55] => 1
)

i used arsort and it worked, but there is a problem because this function make change defult sorted keys and sort array to:

Array
(
    [13] => 5
    [82] => 5
    [21] => 4
    [61] => 3
    [53] => 2
    [34] => 2
    [55] => 1
    [70] => 1
)

解决方案

Construct a new array whose elements are the original array's keys, values, and also position:

$temp = array();
$i = 0;
foreach ($array as $key => $value) {
  $temp[] = array($i, $key, $value);
  $i++;
}

Then sort using a user-defined order that takes the original position into account:

uasort($temp, function($a, $b) {
 return $a[2] == $b[2] ? ($a[0] > $b[0]) : ($a[2] < $b[2] ? 1 : -1);
});

Finally, convert it back to the original associative array:

$array = array();
foreach ($temp as $val) {
  $array[$val[1]] = $val[2];
}

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