基于密钥对多维数组进行排序

I am trying to sort an array based on a particular key value in a multidimensional array as follows

我试图根据多维数组中的特定键值对数组进行排序，如下所示

<?php
$country = array(
    array(
        'country' => 'India',
        'visits' => 22,
        'newVisits' => 16,
        'newVisitsPercent' => 72.7),
    array(
        'country' => 'USA',
        'visits' => 30,
        'newVisits' => 15,
        'newVisitsPercent' => 50),
    array(
        'country' => 'Japan',
        'visits' => 25,
        'newVisits' => 15,
        'newVisitsPercent' => 60));
?>

I wanna Sort the array in Descending order of the 'visits' key of the array.

我想按照数组的“访问”键的降序对数组进行排序。

Desired Array is

期望的阵列是

<?php
$country = array(
    array(
        'country' => 'USA',
        'visits' => 30,
        'newVisits' => 15,
        'newVisitsPercent' => 50),
    array(
        'country' => 'Japan',
        'visits' => 25,
        'newVisits' => 15,
        'newVisitsPercent' => 60),
    array(
        'country' => 'India',
        'visits' => 22,
        'newVisits' => 16,
        'newVisitsPercent' => 72.7));
?>

Tried to search in SO all results were sorting based on the value of the key. Please let me know which function do we need to use.

试图在SO中搜索所有结果都是根据键的值进行排序。请告诉我们我们需要使用哪种功能。

I looked in to ksort, Multi-sort functions

我查看了ksort，多重排序函数

2 个解决方案

#1

take a look at the documentation of usort: http://www.php.net/manual/en/function.usort.php

看一下usort的文档：http：//www.php.net/manual/en/function.usort.php

#2

PHP has a builtin function called usort() which can sort these types of arrays.

PHP有一个名为usort（）的内置函数，可以对这些类型的数组进行排序。

Your comparison function could look something like this:

您的比较函数可能如下所示：

function mycmp($a, $b) {
  return intval($a['visits']) - intval($b['visits']);
}

#1