Question

data = [{id: 1, total: 400},{id: 2, total: 100},{id: 3, total: 500},{id: 4, total: 10}]

如何按总计对该数组进行排序？此外，我还试图获得总数，但我失败了。

foreach($data as $val){
  $d[] = $val['total'];
}
return $d;

得到了这个错误。

不能使用stdClass类型的对象作为数组

Answer 1

尝试usort：如果您仍然使用PHP 5.2或更早版本，则必须首先定义排序功能：

$json = '[{"id": 1, "total": 400}, {"id": 2, "total": 100}, {"id": 3, "total": 500}, {"id": 4, "total": 10}]';

    $myArray = json_decode($json, true);
    function sortByOrder($a, $b)
    {
        return $a['total'] - $b['total'];
    }

    usort($myArray, 'sortByOrder');
    print_r($myArray);

从PHP 5.3开始，您可以使用匿名函数：

usort($myArray, function ($a, $b) {
    return $a['total'] - $b['total'];
});

最后，使用PHP 7，您可以使用“太空飞船运营商”：

usort($myArray, function ($a, $b) {
        return $a['type'] <=> $b['type'];
});

<强>输出：

Array
(
    [0] => Array
        (
            [id] => 4
            [total] => 10
        )

    [1] => Array
        (
            [id] => 2
            [total] => 100
        )

    [2] => Array
        (
            [id] => 1
            [total] => 400
        )

    [3] => Array
        (
            [id] => 3
            [total] => 500
        )

)

Answer 2

必需：按total属性对对象数组进行排序。

码

$json = '[{"id": 1, "total": 400}, {"id": 2, "total": 100}, {"id": 3, "total": 500}, {"id": 4, "total": 10}]';

$data = json_decode($json);

usort($data, function ($t1, $t2) {
        return $t1->total - $t2->total;
    }); 

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

输出：

Array
(
    [0] => stdClass Object
        (
            [id] => 4
            [total] => 10
        )

    [1] => stdClass Object
        (
            [id] => 2
            [total] => 100
        )

    [2] => stdClass Object
        (
            [id] => 1
            [total] => 400
        )

    [3] => stdClass Object
        (
            [id] => 3
            [total] => 500
        )
)

php按列名排序多维数组

2 个答案:

码

输出：