Online PHP editor | output for J8Opk

@ 2019-06-03T08:07:55Z

<?php

$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,
        ],
    ],
];
$keys  = array_flip(['BG', 'MT', 'GE']); // best of two 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, $largest2));
    });
}
print_r($temp);

Output for 8.4.1 - 8.4.13: Warning: {closure:/in/J8Opk:40}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Warning: {closure:/in/J8Opk:40}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Warning: {closure:/in/J8Opk:40}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Array ( [5] => 300 [6] => 310 [7] => 305 )
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.26: Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 40 Array ( [5] => 300 [6] => 310 [7] => 305 )
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33: Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 53 Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 53 Warning: {closure}(): Argument #1 ($result) must be passed by reference, value given in /in/J8Opk on line 53 Array ( [5] => 300 [6] => 310 [7] => 305 )
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Array ( [5] => 300 [6] => 310 [7] => 305 )

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