按列对二维数组的行进行分组，并对每组中的另一列求和

Question

我有这个数组：

Array (
  [0] => Array (
    [TaxeName] => TPS
    [TaxeAmount] => 7
    [Price] => 14
  )
  [1] => Array (
    [TaxeName] => TVQ
    [TaxeAmount] => 9.975
    [Price] => 10
  )
  [2] => Array (
    [TaxeName] => TVQ
    [TaxeAmount] => 9.975
    [Price] => 18
  )
)

我如何获得另一个数组：
- 将

TaxeName

和

TaxeAmount

和
分组 - 计算金额的总和

Price

?

像这样：

Array (
  [0] => Array (
    [TaxeName] => TPS
    [TaxeAmount] => 7
    [Price] => 14
  )
  [1] => Array (
    [TaxeName] => TVQ
    [TaxeAmount] => 9.975
    [Price] => 28
  )
)

Answer 1

可以通过嵌套来完成

foreach

:

$original = array(.......); // your current array
$newArr = array();

foreach($original as $origVal){
    $exists = false;
    foreach($newArr as $key => $newVal){
        if($newVal['TaxeName'] == $origVal['TaxeName']){
            $newArr[$key]['Price'] += $origVal['Price'];
            $exists = true;
            break;
        }
    }

    if(!$exists){
        $newArr[] = $origVal;
    }
}

输出

Array
(
    [0] => Array
        (
            [TaxeName] => TPS
            [TaxeAmount] => 7
            [Price] => 14
        )

    [1] => Array
        (
            [TaxeName] => TVQ
            [TaxeAmount] => 9.975
            [Price] => 28
        )

)

Answer 2

也许是这样的：

$final = array();
foreach ($arr as $subarr)
{
    if (!isset($final[$subarr['TaxeName']]))
    {
        $final[$subarr['TaxeName']] = array('Price' => 0);
    }
    $final[$subarr['TaxeName']]['TaxeName'] = $subarr['TaxeAmount'];
    $final[$subarr['TaxeName']]['TaxeName'] = $subarr['TaxeName'];
    $final[$subarr['TaxeName']]['Price'] = $final[$subarr['TaxeName']]['Price'] + $subarr['Price'];
}

这个想法是用您需要的值创建一个新数组，并将价格设置为 0 进行初始化，以便您可以在 foreach 中递增它

Answer 3

你也可以这样做：

<?php

// Source
$myData = array(
    array(
        'TaxeName' => 'TPS',
        'TaxeAmount' => 7,
        'Price' => 14,
    ),
    array(
        'TaxeName' => 'TVQ',
        'TaxeAmount' => 9.975,
        'Price' => 10,
    ),
    array(
        'TaxeName' => 'TVQ',
        'TaxeAmount' => 9.975,
        'Price' => 18,
    )
);

// Helper Function
function parseData($data)
{
    $parsedData = array();

    if (is_array($data)) {
        foreach ($data as $dataItem) {
            if (!array_key_exists($dataItem['TaxeName'], $parsedData)) {
                $parsedData[$dataItem['TaxeName']] = array(
                    'TaxeName' => $dataItem['TaxeName'],
                    'TaxeAmount' => $dataItem['TaxeAmount'],
                    'Price' => floatval($dataItem['Price'])
                );
            } else {
                $parsedData[$dataItem['TaxeName']]['Price'] += floatval($dataItem['Price']);
            }
        }
    }

    return array_values($parsedData);
}

// Test
$parsed_data = parseData($myData);
var_dump($parsed_data);

?>

输出：

Answer 4

只要使用这个函数，输入是你的数组，输出是你需要的数组：

function calculate(array $input){
    $output = [];
    foreach ($input as $v){
        if (array_key_exists($v['TaxeName'], $output)){
            $output[$v['TaxeName']]['Price'] += $v['Price'];
        } else {
            $output[$v['TaxeName']] = $v;
        }
    }

    return array_values($output);
}

Answer 5

我知道这里不欢迎具有外部类的解决方案。我展示这个只是为了说明“对 TaxeName 和 TaxeAmount 进行分组”任务。

//use class tablearray from https://github.com/jspit-de/tableArray
$data = [
  ['TaxeName' => 'TPS', 'TaxeAmount' => 7, 'Price' => 14],
  ['TaxeName' => 'TVQ', 'TaxeAmount' => 9.975, 'Price' => 10],
  ['TaxeName' => 'TVQ', 'TaxeAmount' => 9.975, 'Price' => 18],
  ['TaxeName' => 'TVQ', 'TaxeAmount' => 19.975, 'Price' => 23]
];

$newData = tableArray::create($data)
  ->filterGroupSum('Price',['TaxeName','TaxeAmount'])
  ->fetchAll()
;

echo '<pre>';
var_export($newData);

输出：

array (
  0 => 
  array (
    'TaxeName' => 'TPS',
    'TaxeAmount' => 7,
    'Price' => 14,
  ),
  1 => 
  array (
    'TaxeName' => 'TVQ',
    'TaxeAmount' => 9.975,
    'Price' => 28,
  ),
  2 => 
  array (
    'TaxeName' => 'TVQ',
    'TaxeAmount' => 19.975,
    'Price' => 23,
  ),
) 

Answer 6

要按单个列进行分组并对每组中的另一列求和，您可以明智地使用

foreach()

 或 

array_reduce()

为了避免在结果数组中创建和（稍后删除）临时分组键，请创建一个代表每个唯一组的引用变量，并将该引用推入结果数组中。 当遇到组的后续成员时，仅对引用进行修改。

$result = [];
foreach ($array as $row) {
    // create group if needed
    if (!isset($ref[$row['TaxeName']])) {
        $ref[$row['TaxeName']] = $row; // assign base elements of group
        $result[] =& $ref[$row['TaxeName']];
        continue;
    }
    // manipulate data within group
    $ref[$row['TaxeName']]['Price'] += $row['Price'];
}
var_export($result);

输出：

array (
  0 => 
  array (
    'TaxeName' => 'TPS',
    'TaxeAmount' => 7,
    'Price' => 14,
  ),
  1 => 
  array (
    'TaxeName' => 'TVQ',
    'TaxeAmount' => 9.975,
    'Price' => 28,
  ),
)

如果要按多列进行分组（例如

TaxeName

 和 

TaxeAmount

），则在迭代每行时形成多个列值的复合字符串。

换句话说，将上述脚本中所有位置的

$row['TaxeName']

替换为

"{$row['TaxeName']} {$row['TaxeAmount']}"

。