Question

我有一个格式如下：

Array
(
    [Jan 14] => Array
        (
            [wasteHierarchy] => Recycling
            [completionDate] => Jan 14
            [totalUom] => 102854
        )

    [Feb 14] => Array
        (
            [wasteHierarchy] => Recycling
            [completionDate] => Feb 14
            [totalUom] => 83954
        )
    [Mar 14] => Array
        (
            [wasteHierarchy] => Landfill
            [completionDate] => Mar 14
            [totalUom] => 97506
        )
)

但是我需要改变数组的布局方式。我想创建一个这种格式的数组：

Array
(
    [Recycling] => Array
        (
            [Jan 14] => 102854
            [Feb 14] => 83954
        )
    [Landfill] => Array
        (
            [Mar 14] => 97506
        )
)

这是我目前的代码：

    $whmOutput = Array();
    foreach($wasteHierMonArr as $whm) {
        $dateChanged = date("M y", strtotime($whm['completion_date']));

        $whmOutput_element = &$whmOutput[$dateChanged];
        $whmOutput_element['wasteHierarchy'] = $whm['waste_hierarchy'];
        $whmOutput_element['completionDate'] = $dateChanged;
        !isset($whmOutput_element['totalUom']) && $whmOutput_element['totalUom'] = 0;
        $whmOutput_element['totalUom'] += $whm['totalTonne'];
    }

    $newWHM = array();
    foreach($whmOutput as $whm) {
        $dateChanged = $whm['completionDate'];

        $wasteHierarchy = $whm['wasteHierarchy'];
        $totalUom = +$whm['totalUom'];

        $newWHM[$wasteHierarchy][$dateChanged] = $totalUom;
    }

但是，这只返回一个数组：

Array
(
    [Recycling] => Array
        (
            [Jan 14] => 102854
            [Feb 14] => 83954
        )
)

我做错了什么？

修改
$wasteHierMonArr是从SQL语句生成的：

SELECT SUM(total_uom) AS totalTonne, waste_hierarchy, completion_date 
FROM enviro_figures_upload 
WHERE completion_date != '' 
AND waste_hierarchy != '' 
GROUP BY waste_hierarchy, DATE_FORMAT(completion_date, '%m-%Y') DESC 
ORDER BY YEAR(completion_date) ASC, MONTH(completion_date) ASC, waste_hierarchy ASC

Answer 1

尝试：

foreach($wasteHierMonArr as $datekey => $dta){
    $newWHM[$dta['wasteHierarchy']][$datekey] = $dta['totalUom];
}

Answer 2

<?php
$whmOutput = Array();
foreach ($wasteHierMonArr as $whm) {
    $whmOutput[$whm['wasteHeirarchy']][$whm['completionDate']] = $whm['totalUom'];
}

Answer 3

$result = [];
foreach ($wasteHierMonArr as $data) {
    $result[$data['wasteHierarchy']][$data['completionDate']] = $data['totalUom'];
}

print_r($result);

如何在PHP中重新排列多维数组

3 个答案: