PHP rewrap array to summarize it - php

Question

I got the following array:
["positive"]=>
array(3) {
[0]=>
array(2) {
[0]=>
int(1473022800000) //unix timestamp
[1]=>
int(100)
}
[1]=>
array(2) {
[0]=>
int(1473109200000)
[1]=>
int(200)
}
[2]=>
array(2) {
[0]=>
int(1473195600000)
[1]=>
int(300)
}// etc...
["neutral"]=>
array(3) {
[0]=>
array(2) {
[0]=>
int(1473022800000) //same day as with positive
[1]=>
int(400)
}
[1]=>
array(2) {
[0]=>
int(1473109200000)//also second same day as with positive
[1]=>
int(500)
}
[2]=>
array(2) {
[0]=>
int(1473195600000)
[1]=>
int(600)
} // etc...
I need to rewrap it to get the following:
["1473022800000"]=>
array(2) {
['positive']=> (int)500 //example values, should be calculated
['neutral'] => (int)200
}
["1473109200000"]=>
array(2) {
['positive']=> (int)500
['neutral'] => (int)200
}
So I need to rewrap it to got not from positives or neutrals but from dates in order to sum it up this way. Any suggestions how to do that with PHP would be welcome. Thank you.
UPD Here is what I have tried so far
foreach($myarray as $key=>$val){ //getting the dates
//var_dump($key);exit;
for($i=0;$i<=30;++$i){
$dates[] = $val[$i][0];
}
}
$dates = array_unique(array_values($dates));
$dates_upd = [];
foreach($dates as $date) {
foreach($myarray as $key=>$val){
for($i=0;$i<=30;++$i){
if($val[$i][0]==$date){
$dates_upd['date'] = $date;
$dates_upd['date']['total'] = $val[$i][1];//getting errors here (cant use a scalar value etc...)
}
}
}
}

Answer 1

You can do this with a couple of nested foreach loops:
$out=[];
foreach($myarray as $key=>$subarray){
foreach($subarray as $item){
$date = $item[0];
$value = $item[1];
$out[$date][$key]=$value;
}
}