在一列上对数组数据进行分组，并对另一列中的数据求和

Question

我的数组数据如下所示：

$array = [
    ['name' => 'Bank BRI', 'amount' => 0], 
    ['name' => 'Bank BRI', 'amount' => 0], 
    ['name' => 'Bank BCA', 'amount' => 1412341234],
    ['name' => 'Bank CIMB Niaga', 'amount' => 532532552], 
    ['name' => 'Bank BRI', 'amount' => 34534534], 
    ['name' => 'Bank CIMB Niaga', 'amount' => 453425243], 
    ['name' => 'Bank BRI', 'amount' => 0], 
    ['name' => 'Bank BNI', 'amount' => 124124], 
    ['name' => 'Bank CIMB Niaga', 'amount' => 352345623], 
    ['name' => 'Bank BCA', 'amount' => 23432423], 
    ['name' => 'Bank Mandiri', 'amount' => 0], 
    ['name' => 'Bank BCA', 'amount' => 0], 
    ['name' => 'Bank BCA', 'amount' => 0], 
    ['name' => 'Bank Permata', 'amount' => 352352353],
];

如何根据相同的“银行名称”计算“金额”。

我的结果应该显示分组名称及其总和：

array (
  'Bank BRI' => 34534534,
  'Bank BCA' => 1435773657,
  'Bank CIMB Niaga' => 1338303418,
  'Bank BNI' => 124124,
  'Bank Mandiri' => 0,
  'Bank Permata' => 352352353,
)

Answer 1

所以，首先您需要$amountsArray 以某种方式分配您列出的值。那么：

$bankTotals = array();
foreach($amountsArray as $amount)
{
  $bankTotals[$amount['name']] += $amount['amount'];
}

在此之后，$bankTotals 是一个以银行名称为索引的数组，其中包含银行总金额的值。您可以从此处按照您认为合适的方式使用此数组。

可能有用的是另一个 foreach 循环将其全部打印出来：

foreach($bankTotals as $name => $amount)
{
  echo $name.".....".$amount."\n";
}

Answer 2

<?php

// array of bank structure
$banks = array();
$banks[] = array('name'=>'Bank BRI','amount'=>rand());
$banks[] = array('name'=>'Bank BRI','amount'=>rand());
$banks[] = array('name'=>'Bank BCA','amount'=>rand());
$banks[] = array('name'=>'Bank CIMB','amount'=>rand());
$banks[] = array('name'=>'Bank BRI','amount'=>rand());
$banks[] = array('name'=>'Bank CIMB','amount'=>rand());
$banks[] = array('name'=>'Bank BRI','amount'=>rand());
$banks[] = array('name'=>'Bank BNI','amount'=>rand());
$banks[] = array('name'=>'Bank CIMB','amount'=>rand());
$banks[] = array('name'=>'Bank BCA','amount'=>rand());
$banks[] = array('name'=>'Bank Mandiri','amount'=>rand());
$banks[] = array('name'=>'Bank BCA','amount'=>rand());
$banks[] = array('name'=>'Bank BCA','amount'=>rand());
$banks[] = array('name'=>'Bank Permata','amount'=>rand());

// begin the iteration for grouping bank name and calculate the amount
$amount = array();
foreach($banks as $bank) {
    $index = bank_exists($bank['name'], $amount);
    if ($index < 0) {
        $amount[] = $bank;
    }
    else {
        $amount[$index]['amount'] +=  $bank['amount'];
    }
}
print_r($amount); //display 

// for search if a bank has been added into $amount, returns the key (index)
function bank_exists($bankname, $array) {
    $result = -1;
    for($i=0; $i<sizeof($array); $i++) {
        if ($array[$i]['name'] == $bankname) {
            $result = $i;
            break;
        }
    }
    return $result;
}

Answer 3

我宁愿加

$bankTotals = array();
foreach($amountsArray as $amount)
{
 if(isset($bankTotals[$amount['name']]))
    $bankTotals[$amount['name']] += $amount['amount'];
 else
    $bankTotals[$amount['name']] = $amount['amount'];
}

Answer 4

C# 中的示例：

Dictionary<string,object>[] items = {
  new Dictionary<string, object> {{ "name", "Bank BRI"}, {"amount", 0 }},
  new Dictionary<string, object> {{ "name", "Bank BRI"}, {"amount", 0 }},
  new Dictionary<string, object> {{ "name", "Bank BCA"}, {"amount", 1412341234 }},
  new Dictionary<string, object> {{ "name", "Bank CIMB Niaga"}, {"amount", 532532552 }} 
};

var amounts = new Dictionary<string, int>();

foreach (var item in items) {
  string bank = (string)item["name"];
  int amount = (int)item["amount"];
  if (amounts.ContainsKey(bank)) {
    amounts[bank] += amount;
  } else {
    amounts.Add(bank, amount);
  }
}

foreach (var amount in amounts) {
  Console.WriteLine("{0}: {1}", amount.Key, amount.Value);
}

Answer 5

@Shubham 的循环是一种完全合适的技术。

如果您愿意，不妨使用array_reduce()：

• 避免生成全局范围的变量或
• 想要使用返回值或
• 一般更喜欢实用风格

null 合并运算符可防止生成任何警告/错误以添加到结果数组中尚未声明的元素中

代码：(Demo)

var_export(
    array_reduce(
        $array,
        function($carry, $row) {
            $carry[$row['name']] = ($carry[$row['name']] ?? 0) + $row['amount'];
            return $carry;
        }
    )
);

输出：

array (
  'Bank BRI' => 34534534,
  'Bank BCA' => 1435773657,
  'Bank CIMB Niaga' => 1338303418,
  'Bank BNI' => 124124,
  'Bank Mandiri' => 0,
  'Bank Permata' => 352352353,
)

Answer 6

$a = arrayofindonesianbanks;

foreach ($a as $anarrays) {
        echo "$anarrays[name]."  ".$anarrays[amount]";
    }
}

在 php 中查看 foreach。