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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 git.master, git.master_jit, rfc.property-hooks: Array ( [A2] => 1786.75 [A1] => 3453.5 [A6] => 2897.9166666667 [A3] => 2342.3333333334 [A5] => 4009.0833333333 [A4] => 3453.5 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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