Question

我在以下结构中的数组中包含数据：

[8] => Array
    (
        [totalTonne] => 660
        [wasteHierarchy] => Recycling
        [completionDate] => 2014-05-20
    )

[9] => Array
    (
        [totalTonne] => 860
        [wasteHierarchy] => Recycling
        [completionDate] => 2014-05-21
    )

[10] => Array
    (
        [totalTonne] => 520
        [wasteHierarchy] => Disposal (Landfill)
        [completionDate] => 2014-06-23
    )

[11] => Array
    (
        [totalTonne] => 420
        [wasteHierarchy] => Disposal (Landfill)
        [completionDate] => 2014-06-24
    )

我想要的是拥有这样的结构：

[Disposal (Landfill)] => Array
    (
        [May 14] => 11180
    )

[Energy Recovery] => Array
    (
        [Jun 14] => 16320
        [Aug 14] => 22940
        [Nov 14] => 21820
    )

[Recycling] => Array
    (
        [Jul 14] => 18660
        [Sep 14] => 22480
        [Oct 14] => 17800
        [Dec 14] => 19160
        [Jan 15] => 5520
    )

因此，每个wasteHierarchy都会自行分组，然后日期按月和年分组，并将累积的totalTonne值添加到其中。

到目前为止，我的PHP代码如下：

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

            $whmOutput_element = &$whmOutput[$dateChanged];
            $whmOutput_element['wasteHierarchy'] = $whm['wasteHierarchy'];
            $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，该代码无法正常完成工作。虽然它创建了我追求的结构，但它没有正确地重新排列数据。它没有正确地对日期进行分组，因此，totalTonne值不正确。

如何修改代码才能实现此目的？

Answer 1

这样的事情应该有效

$whmOutput = array();
foreach ($wasteHierMon as $whm) {
    $dateChanged = date("M y", strtotime($whm['completionDate']));
     // if not defined, define with value zero
    if (!isset($whmOutput[$whm['wasteHierarchy']][$dateChanged])) {
        $whmOutput[$whm['wasteHierarchy']][$dateChanged] = 0;
    }
    // addition will always work now
    $whmOutput[$whm['wasteHierarchy']][$dateChanged] += $whm['totalTonne'];

}

输出：

Array
(
    [Recycling] => Array
        (
            [May 14] => 1520
        )

    [Disposal (Landfill)] => Array
        (
            [Jun 14] => 940
        )

)

的 DEMO

从数组中获取数据并创建一个按PHP在日期中分组的新数据

1 个答案: