减少对象数组内的数组答案

【问题标题】：Reduce arrays inside array of object减少对象数组内的数组
【发布时间】：2018-05-29 15:43:50
【问题描述】：

我有这个数组：

Collection {#319 ▼
  #items: array:6 [▼
    "Seccion 1 Pregunta 1" => array:3 [▼
      "satisfactory" => 2
      "unsatisfactory" => 0
      "total" => 2
    ]
    "Seccion 1 Pregunta 2" => array:3 [▼
      "satisfactory" => 2
      "unsatisfactory" => 0
      "total" => 2
    ]
    "Seccion 1 pregunta 3" => array:3 [▼
      "satisfactory" => 0
      "unsatisfactory" => 1
      "total" => 1
    ]
    "Seccion 2 pregunta 1" => array:3 [▼
      "satisfactory" => 3
      "unsatisfactory" => 0
      "total" => 3
    ]
    "Seccion 2 pregunta 2" => array:3 [▼
      "satisfactory" => 1
      "unsatisfactory" => 1
      "total" => 2
    ]
    "Commentarios seccion 2" => array:3 [▼
      "satisfactory" => 0
      "unsatisfactory" => 0
      "total" => 0
    ]
  ]
}

我想得到所有满意、不满意和总值的总和。比如：

Collection {#319 ▼
    #items: array:3 [▼
          "satisfactory" => 8
          "unsatisfactory" => 2
          "total" => 10
    ]
}

【问题讨论】：

你试过了吗？
multidimensional array array_sum的可能重复

标签： php laravel

【解决方案1】：

如果你知道你想要的钥匙，就这样做：

[
    'satisfactory'   => $collection->sum('satisfactory'),
    'unsatisfactory' => $collection->sum('unsatisfactory'),
    'total'          => $collection->sum('total')
]

如果您不确定键是什么，请对第一项的键进行循环以创建与上述类似的数组。如果您需要将其作为一个集合，只需执行以下操作：

$newCollection = collect( ... array from above ... );

【讨论】：

【解决方案2】：

你可以试试这样的：

$totals = array();
foreach($array as $key => $val) {
    $totals[$key] += $val;
}

【讨论】：

【解决方案3】：

您也可以使用 array_reduce 并传递一个键和值设置为 0 的数组作为起始值。

$result = array_reduce($arrays, function($carry, $item){
    $carry["satisfactory"] += $item["satisfactory"];
    $carry["unsatisfactory"] += $item["unsatisfactory"];
    $carry["total"] += $item["total"];
    return $carry;
}, ["satisfactory" => 0, "unsatisfactory" => 0, "total" => 0]);

print_r($result);

这会给你：

Array
(
    [satisfactory] => 8
    [unsatisfactory] => 2
    [total] => 10
)

【讨论】：

【解决方案4】：

你可以使用array_walk：

$data = [
"Seccion 1 Pregunta 1" => [
  "satisfactory" => 2,
  "unsatisfactory" => 0,
  "total" => 2
],
"Seccion 1 Pregunta 2" => [
  "satisfactory" => 2,
  "unsatisfactory" => 0,
  "total" => 2
],
"Seccion 1 pregunta 3" => [
  "satisfactory" => 0,
  "unsatisfactory" => 1,
  "total" => 1
],
"Seccion 2 pregunta 1" => [
  "satisfactory" => 3,
  "unsatisfactory" => 0,
  "total" => 3
],
"Seccion 2 pregunta 2" => [
  "satisfactory" => 1,
  "unsatisfactory" => 1,
  "total" => 2
],
"Commentarios seccion 2" => [
  "satisfactory" => 0,
  "unsatisfactory" => 0,
  "total" => 0
]
];

$total = array('satisfactory' => 0, 'unsatisfactory' => 0, 'total' => 0);

array_walk($data, function($v) use (&$total) {
   $total['satisfactory'] += $v['satisfactory'];
    $total['unsatisfactory'] += $v['unsatisfactory'];
    $total['total'] += $v['total'];
});

【讨论】：