关联二维数组每行的值求和[重复]

Question

我想对关联行的关联数组的每一行中的值求和。

我的输入：

[
    "A" => ["AA" => 10],
    "B" => ["BA" => 5, "BB" => 1, "BC" => -2],
    "C" => ["CA" => 3, "CB" => 0]
]

期望的结果：

['A' => 10, 'B' => 4, 'C' => 3]

我尝试用

foreach()

来做到这一点，但结果是错误的。

有人可以演示并解释如何做到这一点吗？

Answer 1

您可以循环遍历数组并使用

array_sum

$arr = array(
    "A" => array
        (
            "AA" => 10,
        ),

    "B" => array
        (
            "BA" => 5,
            "BB" => 1,
            "BC" => -2
        ),

    "C" => array
        (
            "CA" => 3,
            "CB" => 0
        )
);

$result = array();
foreach( $arr as $key => $val ){
    $result[$key] = array_sum ( $val );
}

echo "<pre>";
print_r( $result );
echo "</pre>";

这将导致：

Array
(
    [A] => 10
    [B] => 4
    [C] => 3
)

文档：http://php.net/manual/en/function.array-sum.php

Answer 2

这应该适用于像您的示例这样的数组：

 $arr = array(
    "A" => array
        (
            "AA" => 10,
        ),

    "B" => array
        (
            "BA" => 5,
            "BB" => 1,
            "BC" => -2
        ),

    "C" => array
        (
            "CA" => 3,
            "CB" => 0
        )
);
$res = array();
foreach($arr as $key => $value) {
        foreach($value as  $number) {
            (!isset($res[$key])) ?
                $res[$key] = $number :
                $res[$key] += $number;
        }
    }



echo "<pre>";
print_r( $res );
echo "</pre>";

这无需使用内置函数即可工作。

Answer 3

如果你想要总和列

<?php
$array = array
    (
      "A"=>array
        (
"AA" => 10,
        ),
      "B"=>array
        (
            "BA" => 5,
            "BB" => 1,
            "BC" => -2
        ),
      "C"=>array
        (
            "CA" => 3,
            "CB" => 0
         )
        );

foreach ($array as $key=>$value)
{
$mehrdad[]=$key;
}
foreach ($mehrdad as $key1=>$value1)
{
    $arrays=$array[$value1];
foreach ($arrays as $key2=>$value2)
{

$mehrdadi[]=$key2;
}

}
$mehrdadend=array_unique($mehrdadi);
$mehrdadis = array();
foreach ($mehrdadend as $key3=>$value3)
{
$sum=array_sum(array_column($array, $value3));

$mehrdadis[$value3] = $sum;
}
print_r($mehrdadis);
?>

结果

Array
(
    [AA] => 10
    [BA] => 5
    [BB] => 1
    [BC] => -2
    [CA] => 3
    [CB] => 0
)