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@ 2024-01-09T10:37:52Z

<?php

$teams = [
    1 => [
        'AREA I' => [
            'blue' => 30,
            'green' => 25,
        ],
        'AREA II' => [
            'blue' => 15,
        ],
    ],
    2 => [
        'AREA I' => [
            'blue' => 40,
        ],
    ],
];

$filterSets = [
    [],
    [1],
    [2],
    [null, 'AREA I'],
    [null, 'AREA II'],
    [null, null, 'blue'],
    [null, null, 'green'],
    [null, 'AREA I', 'blue'],
    ['foo'],
    [null, null, null, null],
];

function sumViaPath(array $array, array $path): int
{
    $sum = 0;
    $filterKey = $path ? array_shift($path) : null;
    foreach ($array as $k => $v) {
        if ($filterKey === null || $filterKey === $k) {
            $sum += is_array($v) ? sumViaPath($v, $path) : $v;
        }
    }
    return $sum;
}

foreach ($filterSets as $path) {
    $results[json_encode($path)] = sumViaPath($teams, $path);
}
var_export($results);

Output for git.master, git.master_jit, rfc.property-hooks: array ( '[]' => 110, '[1]' => 70, '[2]' => 40, '[null,"AREA I"]' => 95, '[null,"AREA II"]' => 15, '[null,null,"blue"]' => 85, '[null,null,"green"]' => 25, '[null,"AREA I","blue"]' => 70, '["foo"]' => 0, '[null,null,null,null]' => 110, )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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