Question

我有一个看起来像

的数组

Array
(
    [0] => Array
        (
            [id] => 39662
            [points] => 24
            [subject] => 112
        )

    [1] => Array
        (
            [id] => 39609
            [points] => 24
            [subject] => 87
        )

    [2] => Array
        (
            [id] => 39610
            [points] => 23
            [subject] => 77
        )

    [3] => Array
        (
            [id] => 39608
            [points] => 23
            [subject] => 87
        )

    [4] => Array
        (
            [id] => 39606
            [points] => 22
            [subject] => 60
        )

    [5] => Array
        (
            [id] => 39604
            [points] => 19
            [subject] => 75
        )

    [6] => Array
        (
            [id] => 39595
            [points] => 18
            [subject] => 60
        )

    [7] => Array
        (
            [id] => 39605
            [points] => 18
            [subject] => 47
        )

    [8] => Array
        (
            [id] => 39650
            [points] => 17
            [subject] => 87
        )

    [9] => Array
        (
            [id] => 39660
            [points] => 17
            [subject] => 55
        )

)

现在我想根据关键主题的数量进行排序。你可以看到subjuet = 87有3条记录而subject = 60有两条记录，所以87的所有三条记录应首先显示，然后是60条记录，然后是其他记录。

我尝试过array_multisort但它没有给出预期的结果。

由于

Answer 1

根据您所需的输出，您只需要array_map() array_multisort()，

示例：

<?php // Test Array $array = array( array('id'=>39662,'points'=>'24','subject'=>112), array('id'=>39609,'points'=>'24','subject'=>87), array('id'=>39610,'points'=>'23','subject'=>77), array('id'=>39608,'points'=>'23','subject'=>87), array('id'=>39606,'points'=>'22','subject'=>60), array('id'=>39604,'points'=>'19','subject'=>75), array('id'=>39595,'points'=>'18','subject'=>60), array('id'=>39605,'points'=>'18','subject'=>47), array('id'=>39650,'points'=>'17','subject'=>87), array('id'=>39660,'points'=>'17','subject'=>55), ); $newArr = array(); // initialize the new Array foreach ($array as $key => $value) { $newArr[$value['subject']][] = $value; } array_multisort(array_map('count', $newArr), SORT_DESC, $newArr); // using array_multisort() and Sort as DESC order by using array_map() echo "<pre>"; print_r($newArr); ?>

<强>结果：

Array ( [0] => Array ( [0] => Array ( [id] => 39609 [points] => 24 [subject] => 87 ) [1] => Array ( [id] => 39608 [points] => 23 [subject] => 87 ) [2] => Array ( [id] => 39650 [points] => 17 [subject] => 87 ) ) [1] => Array ( [0] => Array ( [id] => 39606 [points] => 22 [subject] => 60 ) [1] => Array ( [id] => 39595 [points] => 18 [subject] => 60 ) ) [2] => Array ( [0] => Array ( [id] => 39604 [points] => 19 [subject] => 75 ) ) [3] => Array ( [0] => Array ( [id] => 39605 [points] => 18 [subject] => 47 ) ) [4] => Array ( [0] => Array ( [id] => 39610 [points] => 23 [subject] => 77 ) ) [5] => Array ( [0] => Array ( [id] => 39660 [points] => 17 [subject] => 55 ) ) [6] => Array ( [0] => Array ( [id] => 39662 [points] => 24 [subject] => 112 ) ) )

Answer 2

针对您的案例尝试以下方法

$data[] = array('points' => 67, 'subject' => 2);
$data[] = array('points' => 86, 'subject' => 1);
$data[] = array('points' => 85, 'subject' => 6);
$data[] = array('points' => 98, 'subject' => 2);
$data[] = array('points' => 86, 'subject' => 6);
$data[] = array('points' => 67, 'subject' => 7);


// Obtain a list of columns
foreach ($data as $key => $row) {
    $subject[$key] = $row['subject'];
}

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

使用php手册中的数组示例。

以上的输出是

Array
(
    [0] => Array
        (
            [points] => 67
            [subject] => 7
        )

    [1] => Array
        (
            [points] => 85
            [subject] => 6
        )

    [2] => Array
        (
            [points] => 86
            [subject] => 6
        )

    [3] => Array
        (
            [points] => 67
            [subject] => 2
        )

    [4] => Array
        (
            [points] => 98
            [subject] => 2
        )

    [5] => Array
        (
            [points] => 86
            [subject] => 1
        )

)

Answer 3

function array_sort($array, $key){

    $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 == $key) {
                        $sortable_array[$k] = $v2;
                    }
                }
            } else {
                $sortable_array[$k] = $v;
            }
        }


       asort($sortable_array);


        }

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

    return $new_array;
}
 array_sort($a, 'subjects');

// $ a是要排序的数组

根据任何值

3 个答案: