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@ 2021-07-17T07:16:52Z

<?php

$multidimensionArray = [
    "A2" => [
        0 => "A1",
        1 => "A2",
        2 => "A3",
    ],
    "A1" => [
        0 => "A1",
        1 => "A6",
        2 => "A5",
        3 => "A2",
    ],
    "A6" => [
        0 => "A3",
    ],
    "A3" => [
        0 => "A3",
        1 => "A2",
    ],
    "A5" => [
        0 => "A4"
    ],
    "A4" => [
        0 => "A4",
        1 => "A3",
    ]
];
$singeArray = [
    "A1" => 675.58333333333,
    "A2" => 1786.75,
    "A3" => 2897.9166666667,
    "A4" => 4009.0833333333,
    "A5" => 5120.25,
    "A6" => 6231.4166666667,
];
$results = [];
foreach ($multidimensionArray as $key => $valueArr) {
    ## filter out all values of interest from $singleArray
    $filteredValues = array_filter($singeArray, function ($value, $identifier) use ($valueArr) {
        return in_array($identifier, $valueArr);
    }, ARRAY_FILTER_USE_BOTH);
    ## Here we get the average
    $results[$key] = array_sum($filteredValues) / count($filteredValues);
}
print_r($results);

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: Array ( [A2] => 1786.75 [A1] => 3453.5 [A6] => 2897.9166666667 [A3] => 2342.3333333334 [A5] => 4009.0833333333 [A4] => 3453.5 )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [A2] => 1786.75 [A1] => 3453.5 [A6] => 2897.9166666667 [A3] => 2342.3333333334 [A5] => 4009.0833333333 [A4] => 3453.5 )

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