[英]Group rows of data and in each group sum one column and concatenate another column
[英]Group array data on one column and sum data from another column
我的数组数据如下所示:
$array = [
['name' => 'Bank BRI', 'amount' => 0],
['name' => 'Bank BRI', 'amount' => 0],
['name' => 'Bank BCA', 'amount' => 1412341234],
['name' => 'Bank CIMB Niaga', 'amount' => 532532552],
['name' => 'Bank BRI', 'amount' => 34534534],
['name' => 'Bank CIMB Niaga', 'amount' => 453425243],
['name' => 'Bank BRI', 'amount' => 0],
['name' => 'Bank BNI', 'amount' => 124124],
['name' => 'Bank CIMB Niaga', 'amount' => 352345623],
['name' => 'Bank BCA', 'amount' => 23432423],
['name' => 'Bank Mandiri', 'amount' => 0],
['name' => 'Bank BCA', 'amount' => 0],
['name' => 'Bank BCA', 'amount' => 0],
['name' => 'Bank Permata', 'amount' => 352352353],
];
如何根据相同的“银行名称”计算“金额”。
我的结果应该显示分组名称及其总和:
array (
'Bank BRI' => 34534534,
'Bank BCA' => 1435773657,
'Bank CIMB Niaga' => 1338303418,
'Bank BNI' => 124124,
'Bank Mandiri' => 0,
'Bank Permata' => 352352353,
)
因此,首先您需要$amountsArray
以某种方式分配您列出的值。 然后:
$bankTotals = array();
foreach($amountsArray as $amount)
{
$bankTotals[$amount['name']] += $amount['amount'];
}
输出:(演示)
Warning: Undefined array key "Bank BRI"
Warning: Undefined array key "Bank BCA"
Warning: Undefined array key "Bank CIMB Niaga"
Warning: Undefined array key "Bank BNI"
Warning: Undefined array key "Bank Mandiri"
Warning: Undefined array key "Bank Permata"
array (
'Bank BRI' => 34534534,
'Bank BCA' => 1435773657,
'Bank CIMB Niaga' => 1338303418,
'Bank BNI' => 124124,
'Bank Mandiri' => 0,
'Bank Permata' => 352352353,
)
在此之后, $bankTotals
是一个以银行名称为索引的数组,其中包含银行总金额的值。 您可以从此处按照您认为合适的方式使用此数组。
可能有用的一件事是另一个foreach
循环将其全部打印出来:
foreach($bankTotals as $name => $amount)
{
echo $name.".....".$amount."\n";
}
<?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;
}
我宁愿添加
$bankTotals = array();
foreach($amountsArray as $amount)
{
if(isset($bankTotals[$amount['name']]))
$bankTotals[$amount['name']] += $amount['amount'];
else
$bankTotals[$amount['name']] = $amount['amount'];
}
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);
}
@Shubham 的循环是一种非常合适的技术。
如果您愿意,您可能希望使用array_reduce()
:
空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
代码:(演示)
var_export(
array_reduce(
$array,
function($carry, $row) {
$carry[$row['name']] = ($carry[$row['name']] ?? 0) + $row['amount'];
return $carry;
}
)
);
或者来自 PHP7.4 的箭头函数语法:( Demo )
var_export(
array_reduce(
$array,
fn($carry, $row) => array_merge($carry, [$row['name'] => ($carry[$row['name']] ?? 0) + $row['amount']]),
[]
)
);
输出:
array (
'Bank BRI' => 34534534,
'Bank BCA' => 1435773657,
'Bank CIMB Niaga' => 1338303418,
'Bank BNI' => 124124,
'Bank Mandiri' => 0,
'Bank Permata' => 352352353,
)
$a = arrayofindonesianbanks;
foreach ($a as $anarrays) {
echo "$anarrays[name]." ".$anarrays[amount]";
}
}
见 php 中的 foreach。
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