merge/sum multi dimentional array php - php

Question

I'm trying to merge/sums 2 arrays that can contain integers or more arrays (themselves containing integer).
When the values are integers, I need to sum them in the final array.
When the values are arrays, I need to loop through the values and sum them in the final array.
If a value or a sub-array exists only in 1 of the base array, it needs to be added in the sub-array of the final array. (This is what I can't do)..)
My arrays are like this:
ARRAY 1
[1466859600] => Array
(
[TOTAL] => 27217
[AAA] => Array
(
[FD_CDP] => 1746
[LO_SC_MIC] => 4654
[FD_ATS] => 893
[CDP] => 40
[SUPERVISION] => 9
[CONTROL] => 4
[ATS] => 4
[EVT_ACK] => 3
)
[BBB] => Array
(
[FD_CDP] => 1376
[LO_SC_MIC] => 4606
[FD_ATS] => 826
[FD_ATSS] => 451
[LO_SFRC] => 4
[FD_S2] => 259
[2_LOSC] => 2
)
[CCC] => Array
(
[FD_CDP] => 1333
[LO_SC_MIC] => 4725
[FD_ATS] => 856
[CONTROL] => 4
[ATS] => 2
[EVT_ACK] => 5
)
ARRAY 2
[1466859600] => Array
(
[TOTAL] => 95406
[AAA] => Array
(
[FD_ATSS] => 1719
[LO_SC_MIC] => 16830
[CONTROL] => 16
[NEW] => 7
[NOEL] => 206
)
[BBB] => Array
(
[SUPERVISION] => 23
[CDP] => 158
[CONTROL] => 40
[2_LOSC] => 14
[ATS] => 6
[EVT_ACK] => 4
)
[CCC] => Array
(
[EVT_ACK] => 167
[LO_SFRC] => 248
[SUPERVISION] => 23
)
I wrote a function like this :
function sumArrayValues($array1, $array2)
{
foreach ($array1 as $key => $value)
{
if (is_array($array1[$key]))
{
echo "it's an array\n I need to reloop\n";
sumArrayValues($array1[$key], $array2[$key]);
}
else
{
echo "FIRST VALUE TO SUM\n";
print_r($array1[$key]."\n");
echo "SECOND VALUE TO SUM\n";
print_r($array2[$key]."\n");
$array1[$key] = (int)$array1[$key] +(int)$array2[$key];
echo "--------RESULT of SUM array1&2----------\n";
}
}
return $array1;
}
But this function doesn't take into account 2 (and probably more) cases: if the sub-array are not in the same order, if a sub-array or a value only exist in second array.
A example of function would be a good help, but on a more fundamental level, I even can't figure the algorithm to do that.
Any ideas ?

Answer 1

You can get all the keys for the foreach loop, live demo.
Note, you also can check if a key of any array is undefined, then save the defined value for the key.
function sumArrayValues($array1, $array2)
{
$keys = array_keys($array1 + $array2);
foreach ($keys as $key)
{
if (is_array($array1[$key]) || is_array($array2[$key]))
$array1[$key] = sumArrayValues($array1[$key], $array2[$key]);
else
#$array1[$key] = (int)$array1[$key] +(int)$array2[$key];
}
return $array1;
}