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uasort排序无效，请教大家，我的代码有什么问题吗？

作者：
gitasp
日期：
2024/12/29
所属分类：
问答

<span style="text-wrap-mode: nowrap;">  uasort排序无效，请教大家，我的代码有什么问题吗？代码如下请帮忙看看</span>

<span style="text-wrap-mode: nowrap;">  public function getIndustry() {</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    $res = Db::name('XXXX')</span>

<span style="text-wrap-mode: nowrap;">        ->where(['status'=>'normal'])</span>

<span style="text-wrap-mode: nowrap;">        ->select();</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    if (!$res) {</span>

<span style="text-wrap-mode: nowrap;">        return $this->ok('请求成功', []);</span>

<span style="text-wrap-mode: nowrap;">    }</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    $industryCat1 = [];</span>

<span style="text-wrap-mode: nowrap;">    $industryCat2 = [];</span>

<span style="text-wrap-mode: nowrap;">    $industryCat3 = [];</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    foreach ($res as $key => $item) {  // 记录键值</span>

<span style="text-wrap-mode: nowrap;">        if ($item['level'] === 1) {</span>

<span style="text-wrap-mode: nowrap;">            $industryCat1[$item['id']] = ['name' => $item['name'], 'weigh' => $item['weigh']];</span>

<span style="text-wrap-mode: nowrap;">            $industryCat2[$item['id']] = [];</span>

<span style="text-wrap-mode: nowrap;">        } else if ($item['level'] === 2) {</span>

<span style="text-wrap-mode: nowrap;">            $industryCat2[$item['pid']][$item['id']] = ['name' => $item['name'], 'weigh' => $item['weigh']];</span>

<span style="text-wrap-mode: nowrap;">            $industryCat3[$item['id']] = [];</span>

<span style="text-wrap-mode: nowrap;">        } else if ($item['level'] === 3) {</span>

<span style="text-wrap-mode: nowrap;">            $industryCat3[$item['pid']][$item['id']] = ['name' => $item['name'], 'weigh' => $item['weigh']];</span>

<span style="text-wrap-mode: nowrap;">        }</span>

<span style="text-wrap-mode: nowrap;">    }</span>

<span style="text-wrap-mode: nowrap;">// 对 industryCat1 按 weigh 降序排序</span>

<span style="text-wrap-mode: nowrap;">uasort($industryCat1, function ($a, $b) {</span>

<span style="text-wrap-mode: nowrap;">    if ($a['weigh'] == $b['weigh']) {</span>

<span style="text-wrap-mode: nowrap;">        return 0;</span>

<span style="text-wrap-mode: nowrap;">    }</span>

<span style="text-wrap-mode: nowrap;">    return ($a['weigh'] < $b['weigh'])? -1 : 1;</span>

<span style="text-wrap-mode: nowrap;">});</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    $res = [</span>

<span style="text-wrap-mode: nowrap;">        'industryCat1' => $industryCat1,</span>

<span style="text-wrap-mode: nowrap;">        'industryCat2' => $industryCat2,</span>

<span style="text-wrap-mode: nowrap;">        'industryCat3' => $industryCat3,</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    ];</span>

<span style="text-wrap-mode: nowrap;"></span>

<span style="text-wrap-mode: nowrap;">    return $this->ok('请求成功', $res);</span>

<span style="text-wrap-mode: nowrap;">}</span>

<span style="text-wrap-mode: nowrap;"><img src="/data/upload/article/20241229/1735468157555507.png" title="1735468157555507.png" alt="image.png"/></span>

对 industryCat1 按 weigh 降序排序，保留键名，但是始终无法按 weigh 降序排序，仍然按键名升序排序，请教大家，这里是不是我写的有问题?万分感谢!

uasort 这里可能有些问题，修改下面的试下 uasort ($industryCat1. function ($a, $b) { if ($a ['weigh'] == $b ['weigh']) { return 0; } return ($a ['weigh'] < $b ['weigh'])? 1 : -1; });

感谢回复，下面的应该怎么修改?您给的代码好像和我的一样。

看1 和-1 那里