Average result of multidimensional array in PHP - php

Question

This is a question for all the array specialists out there. I have an multi dimension array with a result as number (can be 0,1 or 2) and need the average for each grouped by parent.
In the example below the calculation would be:
subentry1_sub1 = 2 + 2 = 4 (4/2=2)
subentry1_sub2 = 1 + 1 = 2 (2/2=1)
So what I try to archive in PHP is the following result:
subentry1_sub1 average = 2
subentry1_sub2 average = 1
...
I already tried some solutions from similar questions. But with all the recursive functions I didn't managed to get it aggregated by the last child name (e.g. subentry1_sub1).
Any ideas?
EDIT:
subentry1_sub1 is 2 + 2 because its two times in the array
[entry1] => [subentry1] => [subentry1_sub1] => result
[entry2] => [subentry1] => [subentry1_sub1] => result
Array
(
[entry1] => Array
(
[subentry1] => Array
(
[subentry1_sub1] => Array
(
[value] => abc
[result] => 2
)
[subentry1_sub2] => Array
(
[value] => abc
[result] => 1
)
)
[subentry2] => Array
(
[subentry2_sub1] => Array
(
[value] => abc
[result] => 1
)
[subentry2_sub2] => Array
(
[value] => abc
[result] => 1
)
)
)
[entry2] => Array
(
[subentry1] => Array
(
[subentry1_sub1] => Array
(
[value] => abc
[result] => 2
)
[subentry1_sub2] => Array
(
[value] => abc
[result] => 1
)
)
[subentry2] => Array
(
[subentry2_sub1] => Array
(
[value] => abc
[result] => 1
)
[subentry2_sub2] => Array
(
[value] => abc
[result] => 1
)
)
)
)

Answer 1

Try this code. In this i have created a new array $sum which will add result value of same subentry childs with same key and another array $count which will count the number of times each key repeats
<?php
$data = array('entry1'=>array(
'subentry1'=>
array(
'subentry1_sub1'=>array('value'=>'abc','result'=>2),
'subentry1_sub2'=>array('value'=>'abc','result'=>1)
),
'subentry2'=>
array(
'subentry2_sub1'=>array('value'=>'abc','result'=>1),
'subentry2_sub2'=>array('value'=>'abc','result'=>1)
)
),
'entry2'=>array(
'subentry1'=>
array(
'subentry1_sub1'=>array('value'=>'abc','result'=>2),
'subentry1_sub2'=>array('value'=>'abc','result'=>1)
),
'subentry2'=>
array(
'subentry2_sub1'=>array('value'=>'abc','result'=>1),
'subentry2_sub2'=>array('value'=>'abc','result'=>1)
)
)
);
$sum = array();
$repeat = array();
foreach($data as $input){
foreach($input as $array){
foreach($array as $key=>$value){
if(array_key_exists($key,$sum)){
$repeat[$key] = $repeat[$key]+1;
$sum[$key] = $sum[$key] + $value['result'];
}else{
$repeat[$key] = 1;
$sum[$key] = $value['result'];
}}}}
echo "<pre>";
print_r($sum);
print_r($repeat);
foreach($sum as $key=>$value){
echo $key. ' Average = '. $value/$repeat[$key]."</br>";
}
Output
Array
(
[subentry1_sub1] => 4
[subentry1_sub2] => 2
[subentry2_sub1] => 2
[subentry2_sub2] => 2
)
Array
(
[subentry1_sub1] => 2
[subentry1_sub2] => 2
[subentry2_sub1] => 2
[subentry2_sub2] => 2
)
subentry1_sub1 Average = 2
subentry1_sub2 Average = 1
subentry2_sub1 Average = 1
subentry2_sub2 Average = 1
You can easily calculate avg now
Note : As you mentioned you are counting occurence of subentry1_sub1 etc so i did the same so it will also count whether key result exists or not

Answer 2

I know this is an old thread but im pretty sure there is a much easier way of doing this for anyone who is interested:
If you know the result will always be a number:
foreach($my_array as $entry_name => $entry_data)
{
foreach($entry_data as $sub_name => $sub_data)
{
$sub_results = array_column($sub_data, 'result');
$averages[$entry_name][$sub_name] = array_sum($sub_results)/count($sub_results);
}
}
If its possible the result could be NULL or empty, this will check it and return 'N/A' if there is no valid data to calculate an average from:
foreach($my_array as $entry_name => $entry_data)
{
foreach($entry_data as $sub_name => $sub_data)
{
$sub_results = array_filter(array_column($sub_data, 'result'));
$averages[$entry_name][$sub_name] = (count($sub_results) > 0 ? array_sum($sub_results)/count($sub_results) : 'N/A');
}
}
both of these solutions will give you an averages array that will output the average per subentry per entry.

Answer 3

Try this like,
<?php
$data=array('entry1'=>array(
'subentry1'=>
array(
'subentry1_sub1'=>array('value'=>'abc','result'=>3),
'subentry1_sub2'=>array('value'=>'abc','result'=>3)
),
'subentry2'=>
array(
'subentry2_sub1'=>array('value'=>'abc','result'=>2),
'subentry2_sub2'=>array('value'=>'abc','result'=>8)
)
),
'entry2'=>array(
'subentry1'=>
array(
'subentry1_sub1'=>array('value'=>'abc','result'=>6),
'subentry1_sub2'=>array('value'=>'abc','result'=>6)
),
'subentry2'=>
array(
'subentry2_sub1'=>array('value'=>'abc','result'=>10),
'subentry2_sub2'=>array('value'=>'abc','result'=>12)
)
)
);
foreach($data as $k=>$v){
echo "----------------$k---------------------\n";
if(is_array($v)){
foreach($v as $a=>$b){
if(is_array($b)){
echo $a.' average = ';
$c=array_keys($b);// now get *_sub*
$v1=isset($b[$c[0]]['result']) ? $b[$c[0]]['result'] : '';
$v2=isset($b[$c[1]]['result']) ? $b[$c[1]]['result'] : '';
echo ($v1+$v2)/2;
echo "\n";
}
}
}
}
Online Demo

Answer 4

In the meantime I found a simple working solution myself:
foreach ($data as $level2) {
foreach ($level2 as $level3) {
foreach ($level3 as $keyp => $level4) {
foreach ($level4 as $key => $value) {
if($key == 'result') $stats[$keyp] += $value;
}
}
}
}
With that you get the total for every key in an new array $stats.
But be sure to checkout the solution from user1234, too. It's working great and already includes the calculation of the average.
https://stackoverflow.com/a/39292593/2466703