How to sum multi-dimensional arrays based on some conditions? - php

Question

$arr = [ [
'5'=>[
'BG' => 50,
'CH' => 60,
'LG' => 50,
'MT' => 40,
'MO' => 80,
'PH' => 60,
'GE' =>null
]
], [
'6'=>[
'BG' => 90,
'CH' => 60,
'LG' => 60,
'MT' => 50,
'MO' =>null,
'PH' => 50,
'GE' =>null
]
],[
'7'=>[
'BG' => 80,
'CH' => 55,
'LG' => 65,
'MT' => 50,
'MO' =>null,
'PH' => 50,
'GE' => 55
]
]
];
For each id no 5, 6 and 7 I want to sum up the score. CH, PH, MO and LG will always be compulsory to sum up. But after summing up the compulsory items, I want to sum up the other item based on the following condition.
If MO is null, take the best two from BG, MT and GE. If MO is not null or greater than or equal to 0, I want to take the best one from BG, MT or GE.
So the sum up result will look like below:
Array
(
[5] => Array
(
[score] => 300
)
[6] => Array
(
[score] => 310
)
[7] => Array
(
[score] => 305
)
)
I have tried foreach, but I could not solve the problem. How do I solve this problem?

Answer 1

Here is more core way to achieve this, please find inline doc for explanation,
$keys = array_flip(['BG', 'MT', 'GE']); // best of how many keys
$Ckeys = array_flip(['CH', 'PH', 'MO', 'LG']); // compulsory keys
foreach ($arr as $key => $value) {
// use to pass parameters to reduce function during call
$temp[key($value)] = array_reduce($value, function (&$result, $a) use ($keys, $Ckeys) {
// if mo empty then best of two else best of one
$bestHowMany = (!empty($a['MO']) ? 1 : 2);
// fetching best of keys from $keys
$t = array_intersect_key($a, $keys);
// reverse sort and maintains keys
arsort($t);
// fetch top $bestHowMany Values
$largest2 = array_slice($t, 0, $bestHowMany);
// fetch compulsory values from CKeys
$t1 = array_intersect_key($a, $Ckeys);
// sum by merging compulsory and best of $bestHowMany values
return array_sum(array_merge($t1, $largest2));
});
}
working demo.
Output
Array
(
[5] => 300
[6] => 310
[7] => 305
)

Answer 2

Here, we can first add all our three arrays, then subtract based on the conditions, and our codes would look like,
$arr = [[
'5' => [
'BG' => 50,
'CH' => 60,
'LG' => 50,
'MT' => 40,
'MO' => 80,
'PH' => 60,
'GE' => null,
],
], [
'6' => [
'BG' => 90,
'CH' => 60,
'LG' => 60,
'MT' => 50,
'MO' => null,
'PH' => 50,
'GE' => null,
],
], [
'7' => [
'BG' => 80,
'CH' => 55,
'LG' => 65,
'MT' => 50,
'MO' => null,
'PH' => 50,
'GE' => 55,
],
],
];
$sum_arr = array();
foreach ($arr as $key => $arr2) {
foreach ($arr2 as $key2 => $value) {
$sum_arr[$key2]["score"] = array_sum(array_values($value));
$temp = [$value["BG"], $value["MT"], $value["GE"]];
arsort($temp);
if ($value["MO"] === null) {
$sum_arr[$key2]["score"] -= $temp[2];
} elseif ($value["MO"] != null && $value["MO"] >= 0) {
$sum_arr[$key2]["score"] -= $temp[2] + $temp[1];
} else {
continue;
}
}
}
var_dump($sum_arr);
Either there is a bug in my code, which is most likely, or I did not understand the if conditions right, or less likely the desired output might be incorrect. However, it should not be difficult to debug it.
Output
array(3) {
[5]=>
array(1) {
["score"]=>
int(300)
}
[6]=>
array(1) {
["score"]=>
int(310)
}
[7]=>
array(1) {
["score"]=>
int(300)
}
}