php 二维数组计算求和

Question

[34] => Array ( [sum] => 13 [name] => 油区开发部 [id] => 27 [parentid] => 1 [children] => Array ( ) ) [35] => Array ( [sum] => 2 [name] => 三分公司 [id] => 31 [parentid] => 1 [children] => Array ( [0] => Array ( [sum] => 156 [name] => 项目管理分中心 [id] => 52 [parentid] => 31 [children] => Array ( ) ) [1] => Array ( [sum] => 12 [name] => 弯管机组 [id] => 54 [parentid] => 31 [children] => Array ( ) ) [2] => Array ( [sum] => 20 [name] => 车队 [id] => 53 [parentid] => 31 [children] => Array ( ) ) [3] => Array ( [sum] => 10 [name] => 维修机组 [id] => 55 [parentid] => 31 [children] => Array ( ) ) [4] => Array ( [sum] => 55 [name] => 机关 [id] => 51 [parentid] => 31 [children] => Array ( ) ) ) ) [36] => Array ( [sum] => 56 [name] => 五分公司 [id] => 32 [parentid] => 1 [children] => Array ( ) ) 如何计算三分公司的sum值，是三分公司 children下的 所有 sum的和

Answer 1

$data = Array
(
    34 => Array
    (
        'sum'     => 13,
        'name'    => '油区开发部',
        'id'      => 27,
        'parentid'=> 1,
        'children' => Array
        (
        ),
    ),
    35 => Array(
        'sum'     => 2,
        'name'    => '三分公司',
        'id'      => 31,
        'parentid'=> 1,
        'children' => Array
        (
            0 => Array
            (
                'sum'     => 156,
                'name'    => '项目管理分中心',
                'id'      => 52,
                'parentid'=> 31,
                'children'=> [],

            ),
            1 => Array
            (
                'sum'     => 12,
                'name'    => '弯管机组',
                'id'      => 54,
                'parentid'=> 31,
                'children'=> [],
            ),
        ),
    ),
    36 => Array
    (
        'sum'     => 56,
        'name'    => '五分公司',
        'id'      => 32,
        'parentid'=> 1,
        'children' => Array
        (
        ),
    )
);

foreach($data as $key => $value)
{
    $data[$key]['sum'] = array_sum(array_column($value['children'],'sum'));
}
print_r($data);

Answer 2

$arr = [[
  'name' => '三分公司',
  'children' => [
    ['sum' => 156],
    ['sum' => 12]
  ]
]];

function getChildrenSum($children)
{
  $sum = 0;
  if (is_array($children)) {
    foreach ($children as $item) {
      $sum += $item['sum'];
      if(isset($item['children'])){
        $sum += getChildrenSum($item['children']);
      }
    }
  }
  return $sum;
}

$sum = array_reduce(
  array_filter($arr, function ($item) {
    return $item['name'] === '三分公司';
  }),
  function ($sum, $item) {
    return $sum + getChildrenSum($item['children']);
  },
  0
);

echo $sum;

Answer 3

foreach计算就可以了。又不是无限极

Answer 4

使用foreach循环。

Answer 5

定义一个变量：$sums = 0;
假设你外面的大数组是 $data,
foreach($data as $key => $value)
{

if($value['name'] == '三分公司'){

        foreach($value['children'] as $k => $v)
        {
           $sums += $v['sum']  
        }
    }

}

print_r($sums);

或者是：
foreach($data as $key => $value)
{

$sums = array_sum(array_column($value['children'],'sum'));

}
print_r($sums);