php - how to sum multi-dimensional array - php

Question

I have data below :
Array(
[A] => Array
(
[AA] => 10
)
[B] => Array
(
[BA] => 5
[BB] => 1
[BC] => -2
)
[C] => Array
(
[CA] => 3
[CB] => 0
)
)
I want to sum the value of second element my array (BA,BB,BC, etc) like this :
Array(
[A] => 10
[B] => 4
[C] => 3
)
I've tried to do with foreach (I'm using php as my platform) but the result is wrong, can someone give me explanation and the logic to solve this? thanks

Answer 1

You can loop thru your array and use 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>";
This will result to:
Array
(
[A] => 10
[B] => 4
[C] => 3
)
Doc: http://php.net/manual/en/function.array-sum.php

Answer 2

This should work for arrays like the one of your example:
$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>";
This is working without using an inbuilt function.

Answer 3

if you want sum column
<?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);
?>
Result
Array
(
[AA] => 10
[BA] => 5
[BB] => 1
[BC] => -2
[CA] => 3
[CB] => 0
)