自定义排序数组 [英] custom sort array

问题描述

$array = array(
   'list1 - 1',
   'list7 - 1',
   'list5 - 2',
   'list3 - 1'
);

我需要对这个数组进行数字排序.该函数应检查等号后的值以进行排序.

I need sort to this array numerically. The function should check the value after the equal sign for sorting.

结果:

list1 - 1
list7 - 1
list3 - 1
list5 - 2

在以上结果中，直到list[5]为止，字母或数字的顺序都没有改变.我该怎么办?

In the above result, the order is not changed either alphabetically or numerically until list[5]. How do I do this?

推荐答案

您似乎想首先搜索尾随数字，但如果它们相同，则希望保留项目的原始顺序.这意味着有更多的思考是必要的，但从本质上讲，这项工作仍然非常简单.

It looks like you want to search firstly on the trailing numbers, but if they are the same then you want to retain the original order of the items. This means a little more thinking is necessary but the job is, in essence, still very simple.

$array = array(
   'list1 - 1',
   'list7 - 1',
   'list5 - 2',
   'list3 - 1',
);

function sort_list(&$subject) {
    // Get an array of the trailing numbers to use within the callback
    $nums = preg_replace('/^.* - (\d+)$/', '$1', $subject);
    // Sort values by trailing number or key
    uksort($subject, function($a,$b) use ($nums) {
        // If numbers are the same, sort by key
        if ($nums[$a] === $nums[$b]) {
            return $a - $b;
        }
        // Othwerise sort by numbers
        return $nums[$a] - $nums[$b];
    });
}

sort_list($array);
var_dump($array);

输出类似:

array(4) {
  [0]=>
  string(9) "list1 - 1"
  [1]=>
  string(9) "list7 - 1"
  [3]=>
  string(9) "list3 - 1"
  [2]=>
  string(9) "list5 - 2"
}

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