PHP Function for Comparing Elements in Different Arrays - php

Question

I have two arrays like so (however there can be more or less than 2 (any amount)):
[0] => Array
(
[assessedUsers] => Array
(
[0] => Array
(
[scores] => Array
(
[0] => 10
[1] => 10
[2] => 10
[3] => 10
)
)
[1] => Array
(
[scores] => Array
(
[0] => 9
[1] => 10
[2] => 0
[3] => 9
)
)
)
)
Where the length of the scores array is always the same in both arrays.
I would like to take each element from each array, one by one, and average them, then append them into a new array.
For example, the output of my desired function would look like this:
[1] => Array
(
[scores] => Array
(
[0] => 9.5
[1] => 10
[2] => 5
[3] => 9.5
)
)
Is there a function that can do this, or do I need a couple nested for() loops? If I need to use forl loops how would I go about doing it? I'm a little confused on the logic behind it.
Currently what I have is:
for ($i = 0; $i < sizeof($data["assessedUsers"]); $i++) {
for ($j = 0; $j < sizeof($data["assessedUsers"][$i]["scores"]); $j++) {
}
}
and I'm a little confused as to what to where to go next. Thanks in advance!

Answer 1

$mean = array_map( function($a, $b) { return ($a + $b) / 2; },
$data['assessedUsers'][0]['scores'],
$data['assessedUsers'][1]['scores']
);
var_dump($mean);
And append $mean anywhere you want. Or do you have more than 2 arrays? You did not state it in your question.
ps: for any number of subarrays
$arr = array(
array('scores' => array(10,10,10,10)),
array('scores' => array(9,10,0,9)),
array('scores' => array(1,2,3,4))
);
// remove arrays from the key
$tmp = call_user_func_array( function() { return func_get_args(); },
array_map( function($a) { return $a['scores']; }, $arr)
);
// add arrays by each element
$mean = array_map( function($val, $ind) use($tmp) {
$sum = 0;
foreach($tmp as $i => $t)
$sum += $t[$ind];
return $sum / ($i + 1);
}, $tmp[0], array_keys($tmp[0]));
var_dump($mean);

Answer 2

Probably two loops:
$newarray();
foreach($main_array as $user) {
foreach($user['assessedUser'][0]['scores'] as $score_key => $user0_value) {
$user1_value = $user['assessedUser'][1]['scores'][$score_key];
$average = ($user1_value + $user0_value) / 2;
... stuff into new array
}
}

Answer 3

I have solution for you, hope this help :)
$scores = array();
for ($i = 0; $i < sizeof($data["assessedUsers"]); $i++) {
for ($j = 0; $j < sizeof($data["assessedUsers"][$i]["scores"]); $j++) {
if(isset($scores[$j])){
$scores[$j] = ($scores[$j] + $data["assessedUsers"][$i]["scores"][$j]) / ($i +1);
}else{
$scores[] = $data["assessedUsers"][$i]["scores"][$j];
}
}
}
$scores[] = $scores;
view Example :)
http://codepad.org/upPjMEym