Sum values in multi dimensional array - php

Question

I'm trying to display the total amount of installs each campaign number has had since the beginning using this array.
Array
(
[27] => Array
(
[0] => Array
(
[date] => 2018-04-09
[hour] => 7
[campaign] => 27
[installs] => 2
[trials] => 0
)
[1] => Array
(
[date] => 2018-04-09
[hour] => 3
[campaign] => 39
[installs] => 1
[trials] => 0
)
[2] => Array
(
[date] => 2018-04-09
[hour] => 5
[campaign] => 39
[installs] => 1
[trials] => 0
)
[3] => Array
(
[date] => 2018-04-09
[hour] => 6
[campaign] => 39
[installs] => 1
[trials] => 0
)
[4] => Array
(
[date] => 2018-04-09
[hour] => 8
[campaign] => 39
[installs] => 2
[trials] => 0
)
)
[53] => Array
(
[0] => Array
(
[date] => 2018-04-10
[hour] => 3
[campaign] => 53
[installs] => 1
[trials] => 0
)
[1] => Array
(
[date] => 2018-04-10
[hour] => 9
[campaign] => 53
[installs] => 1
[trials] => 0
)
[2] => Array
(
[date] => 2018-04-10
[hour] => 5
[campaign] => 55
[installs] => 1
[trials] => 0
)
[3] => Array
(
[date] => 2018-04-10
[hour] => 12
[campaign] => 55
[installs] => 1
[trials] => 0
)
)
[61] => Array
(
[0] => Array
(
[date] => 2018-04-15
[hour] => 0
[campaign] => 61
[installs] => 27
[trials] => 1
)
[1] => Array
(
[date] => 2018-04-15
[hour] => 1
[campaign] => 61
[installs] => 18
[trials] => 0
)
[2] => Array
(
[date] => 2018-04-15
[hour] => 1
[campaign] => 27
[installs] => 10
[trials] => 0
)
My array is shown above. You can see some of the campaign numbers are repeated on different dates. My result should look like:
Campaign 27: 12
Campaign 39: 5
Campaign 53: 2
Campaign 55: 2
Campaign 61: 45
So far I've got this, which doesn't seem to be printing all of the data.
$newarray = array();
$last = count($res) - 1;
foreach ($res as $i => $new){
foreach ($new as $x => $row){
$isFirst = ($i == 0);
$isLast = ($i == $last);
$grabbedvalue = $row['campaign'].",".$row['installs'];
array_push($newarray,$grabbedvalue);
}
}
print_r($newarray);
Hope that someone can help me out with this. Thanks!

Answer 1

Just loop through the array and count:
$data = [
[
'campaign' => 1,
'installs' => 20,
],
[
'campaign' => 1,
'installs' => 5,
],
[
'campaign' => 2,
'installs' => 1,
],
[
'campaign' => 2,
'installs' => 10,
],
[
'campaign' => 3,
'installs' => 9,
],
];
$count=array();
// Loop through the campaigns
foreach($data as $camp){
// Check if we initiated the counting before
if(isset($count[$camp['campaign']])){
// Add installs count to previous value
$count[$camp['campaign']] += $camp['installs'];
} else {
// Initiate the counting
$count[$camp['campaign']] = $camp['installs'];
}
}
var_dump($count);
This will give:
array (size=3)
1 => int 25
2 => int 11
3 => int 9

Answer 2

You should create a for loop inside of a for loop to solve this.
I can try explaining the steps as clearly as possible:
Create an new array ($totalInstalls)
Loop trough the array you specified
Loop trough each element in the array you specified (for loop inside a for loop)
Check if the campaign index of the current element already exists in $totalInstalls
If not set it to the installs
If it does exists increment it by one