分类：杂项

目前遇到二位数组的排序，会用到array_multisort函数。

比如：

$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);
// 对volume降序，edition升序

$volumeList = [];
$editionList = [];
foreach ($data as $item) {
   $volumeList[] = $item['volume'];
   $editionList[] = $item['edition'];
}

array_multisort($volumeList, SORT_DESC, $editionList, SORT_ASC, $data);

print_r($data);

// out
Array
(
    [0] => Array
        (
            [volume] => 98
            [edition] => 2
        )

    [1] => Array
        (
            [volume] => 86
            [edition] => 1
        )

    [2] => Array
        (
            [volume] => 86
            [edition] => 6
        )

    [3] => Array
        (
            [volume] => 85
            [edition] => 6
        )

    [4] => Array
        (
            [volume] => 67
            [edition] => 2
        )

    [5] => Array
        (
            [volume] => 67
            [edition] => 7
        )

)