使用usort和strcomp重新排序PHP数组：bug

问题描述：

Using usort and strcomp together to order an array by one of its keys has an odd effect: it returns my array with fewer items in it than I put in.

The array in my case contains rows representing tasks, and I want to order the rows in the array by the key 'displayorder', which is a number but which I want to be sorted in alphabetical manner (don't ask why).

function treeSort($a, $b) {
        return strcmp(strval($a['displayOrder']), strval($b['displayOrder']));
    }

usort($tree, "treeSort");

There are nine rows, but I only get six of them back. Those six are nicely sorted, by the way. If I use uasort instead of usort, I do get all nine rows, but ordered in a numerical way.

使用usort和strcomp一起按其中一个键对数组进行排序有一个奇怪的效果：它返回我的数组它中的项目比我输入的项目少。 p>

我的案例中的数组包含代表任务的行，我想通过键'displayorder'来排序数组中的行，这是一个数字，但我想按字母方式排序（不要问为什么）。 p>

  function treeSort（$ a，$ b）{
 return strcmp（strval（  $ a ['displayOrder']），strval（$ b ['displayOrder']））; 
} 
 
usort（$ tree，“treeSort”）; 
  code>  pre> 
 \  n 有九排，但我只有六排。 顺便说一句，这六个很好地排序。 如果我使用uasort而不是usort，我会得到所有九行，但是以数字方式排序。 p> 
  div>

答

I've found a solution: array_multisort. That's probably what you'd have proposed Tim if I had given you the details on $tree.

Got the code from the examples in the documentation on array_multisort:

foreach ($tree as $key => $row) {
        $sortOrder[$key] = $row['displayOrder'];
    }
    array_multisort($sortOrder, SORT_STRING, $tree);

使用usort和strcomp重新排序PHP数组：bug

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