按子值排序多维数组并维护主索引

Question

我有一个像这样的多维数组。

arr[4]=array('name' => 'ab', 'aid' => 1 'qty' => 10);
arr[5]=array('name' => 'ac', 'aid' => 3 'qty' => 15);
arr[3]=array('name' => 'ad', 'aid' => 2 'qty' => 100);
arr[2]=array('name' => 'ae', 'aid' => 2 'qty' => 150);

我需要按照＆＃39;援助＆＃39;来对它们进行排序。但不要像这样改变主要指数。

arr[4]=array('name' => 'ab', 'aid' => 1 'qty' => 10);
arr[2]=array('name' => 'ae', 'aid' => 2 'qty' => 150);
arr[3]=array('name' => 'ad', 'aid' => 2 'qty' => 100);
arr[5]=array('name' => 'ac', 'aid' => 3 'qty' => 15);

可能吗？我该怎么办？感谢。

Answer 1

来自PHP手册

<?php
    $data[] = array('volume' => 67, 'edition' => 2);
    $data[] = array('volume' => 86, 'edition' => 1);
    $data[] = array('volume' => 85, 'edition' => 6);
    $data[] = array('volume' => 98, 'edition' => 2);
    $data[] = array('volume' => 86, 'edition' => 6);
    $data[] = array('volume' => 67, 'edition' => 7);
?>

在这个例子中，我们将按卷递减，升序版。

我们有一个行数组，但是array_multisort（）需要一个列数组，所以我们使用下面的代码来获取列，然后执行排序。

<?php
    // Obtain a list of columns
    foreach ($data as $key => $row) {
        $volume[$key]  = $row['volume'];
        $edition[$key] = $row['edition'];
    }

    // Sort the data with volume descending, edition ascending
    // Add $data as the last parameter, to sort by the common key
    array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
?>

http://php.net/manual/en/function.array-multisort.php

修改

根据您的需要，您要求：     

$arr[4]=array('name' => 'ab', 'aid' => 1, 'qty' => 10);
$arr[5]=array('name' => 'ac', 'aid' => 3, 'qty' => 15);
$arr[3]=array('name' => 'ad', 'aid' => 2, 'qty' => 100);
$arr[2]=array('name' => 'ae', 'aid' => 2, 'qty' => 150);

$keyPositions = array();
foreach ($arr as $key => $value) {
    $keyPositions[] = $key;
}


foreach ($arr as $key => $row) {
    $aid[$key]  = $row['aid'];
}

array_multisort($aid, SORT_ASC, $arr);

$sortedArray = array();
foreach ($arr as $key => $value) {
    $sortedArray[$keyPositions[$key]] = $value;
}

echo '<pre>';
print_r($sortedArray);
echo '</pre>';

?>