php - Multidimensional Array To Single dimension Array With Sum Up - php

Question

I have this array:
Array
(
[one] => Array
(
[a] => 0
[b] => 1
[c] => 1
[d] => 3
[e] => 1
)
[two] => Array
(
[a] => 0
[b] => 3
[c] => 1
[d] => 4
[e] => 1
)
[three] => Array
(
[a] => 3
[b] => 1
[c] => 2
[d] => 4
[e] => 1
)
)
And I want to convert it into single array with the values are the sums of every value inside the inner array, so it could be like this:
Array
(
[a] => 3
[b] => 5
[c] => 4
[d] => 11
[e] => 3
)
How to achieve it?
EDIT
This was the best what I've done:
$rest = array();
foreach($result as $key => $value){
if(is_array($value)) {
foreach($value as $k => $val){
$rest[$k] = array_sum($value);
}
}
}
But it returns all values to be the same, i.e all 9 on every inner key.

Answer 1

You can get the keys from the first child array with array_keys, and then use array_sum and array_column to generate the array of sums.
foreach (array_keys($your_array['one']) as $key) {
$sums[$key] = array_sum(array_column($your_array, $key));
}
array_column does require php >= 5.5.
Incidentally, what you already had was really close to working. If you change
$rest[$k] = array_sum($value);
to
$rest[$k] += $val;
It should be good to go. What you had before was repeatedly summing the entire sub-array and assigning it to each letter key, but you just needed to add the current value to that letter key.
$rest[$k] += $val; will work, but give you undefined index notices for the first sub-array. You can fix that by checking isset before assigning, like this:
$rest[$k] = isset($rest[$k]) ? $rest[$k] + $val : $val;
I would say modifying your original code to work this way would probably be better than redefining array_column if you can't use it.

Answer 2

You have multidimensional Array , that why have to use two loop for understanding in beginning level. First loop will get Every Object of Array , Second Array will get the Params of Object.
$finalArray = array();
for($i = 0;$i<count($array);$i++){ // GET ALL OBJECT FROM ARRAY
foreach($array[$i] as $key=>$value){ // GET ALL KEY FROM OBJECT
$finalArray[$key] += $array[$i][$key];
}
}
print_r($finalArray);
Work on all version of PHP

Answer 3

You can use array_sum and loop over the first dimension
foreach ($array as $key => $values) {
$newArray[$key] = array_sum($values);
}

Answer 4

Credit to Don't Panic's answer above and this answer which is providing array_column() alternative for PHP version < 5.5
// if array_column function don't exist, add array_column function
if (! function_exists('array_column')) {
function array_column(array $input, $columnKey, $indexKey = null) {
$array = array();
foreach ($input as $value) {
if ( ! isset($value[$columnKey])) {
trigger_error("Key \"$columnKey\" does not exist in array");
return false;
}
if (is_null($indexKey)) {
$array[] = $value[$columnKey];
}
else {
if ( ! isset($value[$indexKey])) {
trigger_error("Key \"$indexKey\" does not exist in array");
return false;
}
if ( ! is_scalar($value[$indexKey])) {
trigger_error("Key \"$indexKey\" does not contain scalar value");
return false;
}
$array[$value[$indexKey]] = $value[$columnKey];
}
}
return $array;
}
}
// sum up the values
$rest = array();
foreach($result as $key => $arr){
if(is_array($arr)) {
foreach($arr as $k => $val){
$rest[$k] = array_sum(array_column($result, $k));
}
}
}