比较多个值的排序数组答案

【问题标题】：Sorting array with multiple values compared比较多个值的排序数组
【发布时间】：2017-10-17 10:40:13
【问题描述】：

我有以下数组

$postarray[] = array( 'total'   => '6.5', 'points'  => '300' );
$postarray[] = array( 'total'   => '11.4', 'points' => '320' );
$postarray[] = array( 'total'   => '6.5', 'points'  => '340' );
$postarray[] = array( 'total'   => '2.6', 'points'  => '300' );
$postarray[] = array( 'total'   => '12.8', 'points' => '320' );

我想将它排序成以下内容。请注意，如果 points 相等，则它会比较 total 并按升序对其进行排序。

$postarray[] = array( 'total'   => '6.5', 'points'  => '340' );
$postarray[] = array( 'total'   => '12.8', 'points' => '320' );
$postarray[] = array( 'total'   => '11.4', 'points' => '320' );
$postarray[] = array( 'total'   => '6.5', 'points'  => '300' );
$postarray[] = array( 'total'   => '2.6', 'points'  => '300' );

到目前为止，我已经使用usort 根据points 进行排序，但我也不确定如何对total 字段进行排序。

    function sortByOrder($a, $b) {
        if ($b['points'] > $a['points']) {
            return $b['points'] - $a['points'];
        } elseif ($b['points'] == $a['points']) {
            return 0;
        }
    }
    usort($postarray, 'sortByOrder');

【问题讨论】：

检查：one 和 two

标签： php arrays sorting

【解决方案1】：

array_multisort() 和 array_column() 自 PHP 5.5.0 起：

array_multisort(array_column($postarray, 'points'), SORT_DESC,
                array_column($postarray, 'total'),  SORT_DESC,
                $postarray);

【讨论】：

【解决方案2】：

您可以使用 php.net 提供到 sort 示例中的示例：

<?php

function array_sort($array, $on, $order=SORT_ASC)
{
    $new_array = array();
    $sortable_array = array();

    if (count($array) > 0) {
        foreach ($array as $k => $v) {
            if (is_array($v)) {
                foreach ($v as $k2 => $v2) {
                    if ($k2 == $on) {
                        $sortable_array[$k] = $v2;
                    }
                }
            } else {
                $sortable_array[$k] = $v;
            }
        }

        switch ($order) {
            case SORT_ASC:
                asort($sortable_array);
            break;
            case SORT_DESC:
                arsort($sortable_array);
            break;
        }

        foreach ($sortable_array as $k => $v) {
            $new_array[$k] = $array[$k];
        }
    }

    return $new_array;
}

$postarray[] = array( 'total'   => '6.5', 'points'  => '300' );
$postarray[] = array( 'total'   => '11.4', 'points' => '320' );
$postarray[] = array( 'total'   => '6.5', 'points'  => '340' );
$postarray[] = array( 'total'   => '2.6', 'points'  => '300' );
$postarray[] = array( 'total'   => '12.8', 'points' => '320' );

 print_r(array_sort($postarray, 'points', SORT_DESC));

【讨论】：