PHP:填充数组时将项限制为10 - PHP: limit items to 10 when filling an array

PHP: limit items to 10 when filling an array

本文关键字：填充数组 PHP | 更新日期: 2023-09-27

我使用以下方法从simpleXML字符串创建一个二维数组，到目前为止效果良好：

$dataRaw = array();
foreach($objRanking->history as $history) { if($history->groupName == "currentMonth") {
    $dataRaw[(string)$history->groupName->item] = (int)$history->groupName->groupCount;
}}

阵列如下所示：

Array ( [item1] => 2 [item2] => 3 [item3] => 5 [item4] => 7 [item5] => 11 [item6] => 13 [item7] => 17 [item8] => 19 [item9] => 23 [item10] => 29 [item11] => 31 [item12] => 37 )

有没有一种方法可以将其限制为数组中最多10个项目，然后将所有剩余项目总结为[其他]，并将其值作为剩余值的总和？

非常感谢你的帮助，迈克。

初始化一个计数器，并在每次迭代中不断递增。在每次迭代中，检查计数器是否低于10——如果是，请像往常一样将数据添加到数组$dataRaw中。当计数器值大于10时，开始将它们添加到新数组中（此处为$restOfTheItems）。循环完成后，您可以简单地创建一个新索引，对数组值求和并进行赋值

$dataRaw = array();
$restOfTheItems = array();
$i = 0;
foreach($objRanking->history as $history) { 
    if($i <= 10) {
        if($history->groupName == "currentMonth") {
            $dataRaw[(string)$history->groupName->item] = (int)$history->groupName->groupCount;
        }
    } else {
        $restOfTheItems[] = (int)$history->groupName->groupCount;
    } 
    $i++;
}
$dataRaw['Others'] = array_sum($restOfTheItems);

当然。要在将数组一分为二之后执行此操作，请总结第二个块并将其附加到第一个块：

if (count($dataRaw) > 10) {
    $firstTen = array_slice($dataRaw, 0, 10, true);
    $others = array_slice($dataRaw, 10, null, true);
    $dataRaw = $firstTen;
    $dataRaw['Others'] = array_sum($others);
}

你当然也可以在初始处理过程中这样做：

foreach($objRanking->history as $history) {
    if($history->groupName == "currentMonth") {
        $groupCount = (int)$history->groupName->groupCount;
        switch(count($dataRaw)) {
            case 11:
                // we already have "Others", so sum the counts
                $dataRaw['Others'] += $groupCount;
                break;
            case 10:
                // we already have 10 items, so add "Others"
                $dataRaw['Others'] = $groupCount;
                break;
            default:
                // less than 10 existing items, add one
                $dataRaw[(string)$history->groupName->item] = $groupCount;
                break;
        }
    }
}