php array_multisort()由2个字段组成

Question

我使用array_multisort()函数按字段值对数组进行排序.我需要的是按日期和时间按2个字段值对其进行排序.这是数组的结构:

Array
(
    [0] => Array
        (
            [id_art] => 5292
            [free_art] => 0
            [apero_art] => 0
            [name_cat] => Teatro
            [date_dat] => 2010-11-24
            [date2_dat] => 0000-00-00
            [name_spa] => Cinema Teatro
            [title_int] => Il piacere dell'onestà 
            [id_cat] => 2
            [time_tim] => 20:30:00
            [intro_int] => Una produzione Teatro Eliseo di Roma - ChiassoCultura 
            [image_art] => noimage.png
        )

    [1] => Array
        (
            [id_art] => 4983
            [free_art] => 0
            [apero_art] => 0
            [name_cat] => Cinema
            [date_dat] => 2011-04-20
            [date2_dat] => 2011-04-20
            [name_spa] => Cinema Morettina
            [title_int] => Inland Empire
            [id_cat] => 1
            [time_tim] => 20:30:00
            [intro_int] => Rassegna dedicata a David Lynch
            [image_art] => noimage.png
        )

    [2] => Array
        (
            [id_art] => 4983
            [free_art] => 0
            [apero_art] => 0
            [name_cat] => Cinema
            [date_dat] => 2011-04-22
            [date2_dat] => 2011-04-22
            [name_spa] => Cinema Iride
            [title_int] => Inland Empire
            [id_cat] => 1
            [time_tim] => 17:00:00
            [intro_int] => Rassegna dedicata a David Lynch
            [image_art] => noimage.png
        )....

我现在做的是:

function array_sort_by_column(&$arr, $col, $dir = SORT_ASC) {
    $sort_col = array();
    foreach ($arr as $key=> $row) {
        $sort_col[$key] = $row[$col];
    }
    array_multisort($sort_col, $dir, $arr); 
}

我怎么能一次轻松地进行双重排序？

谢谢.

Answer 1

如果我理解你需要做什么,你可以使用usort:

usort($array, function($a, $b) {
    if ($a['date_cat'] > $b['date_cat']) return 1;
    if ($a['date_cat'] < $b['date_cat']) return -1;
    if ($a['time_tim'] > $b['time_tim']) return 1;
    if ($a['time_tim'] < $b['time_tim']) return -1;        
    return 0;
});

对我来说,你的功能有点曲折.您提取数组的一列以创建一个数组,以排序链接到原始数组.它花了几个读数和一个php手动检查来理解你的代码(太糟糕了),你应该(对我来说)在调用sort之前将索引数组的创建分离到另一个函数中.

如果你需要选择动态列,也许你可以利用闭包(PHP 5.3+？):

function your_sort($orderby, $array) {
    return usort($array, function ($a, $b) use ($orderby) {
        foreach($orderby as $field) {
            if ($a[$field] > $b[$field]) return 1;
            if ($a[$field] < $b[$field]) return -1;
        }
        return 0;
    });
}

然后你可以像这样调用函数:

your_sort(array('date_cat','time_tim'), $array);