Php 按子数组计数对多维数组排序

我对数组排序有问题

我的类别有一个数组，如下所示：

Array
(
    [0] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [2] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
    [1] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [2] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [3] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
    [2] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
)

我想按

计数（子类别）

对该数组进行排序，如下所示：

Array
(
    [0] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [2] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [3] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
    [1] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [2] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
    [2] => Array
        (
            [title] => category
            [url] => http//mycategoryurl
            [subcategory] => Array
                (
                    [0] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                    [1] => Array
                        (
                            [title] => category - first
                            [url] => http//mycategoryurl
                        )
                )
        )
)

请帮助我像我的示例中那样对该数组进行排序。

使用回调函数：

$arr = array(); // your array
usort($arr, function($a, $b) { return count($a['subcategory']) < $count($b['subcategory'])? -1 : 1; });
print_r($arr);

$arr=array（）；//你的阵列
usort（$arr，function（$a，$b）{返回计数（$a['subcategory']）<$count（$b['subcategory']）？-1:1；}）；
印刷费（$arr）；

您将希望像这样使用函数：

usort($arrayToSort, function($a, $b){
    $aCount = count($a['subcategory']);
    $bCount = count($b['subcategory']);
    if ($aCount  == $bCount) {
        return 0;
    }

    //flip the '>' to '<' for ascending sort. It is set to do descending 
    return ($aCount > $bCount) ? -1 : 1;

});

usort（$arrayToSort，函数（$a，$b）{
$aCount=count（$a['subcategory']）；
$b计数=计数（$b[‘子类别’]）；
如果（$a计数==$b计数）{
返回0；
}
//将“>”切换为“它正在工作，但我希望排序是desc。现在是acs。谢谢。我已经更改了”。现在一切正常。非常感谢我的朋友