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@ 2025-01-30T23:10:37Z

<?php
$array = [
    '2017-05-01' => [
        'DC' => [
            'IT' => [90, 0],
            'DE' => [18, 315, 40, '', 69, 211],
            'Other' => [107, 46, '', '', 27, 22]
        ]
    ],
    '2017-05-02' => [
        'DC' => [
            'IT' => [70, 40, 55],
            'DE' => ['', 31, 4, '', 9],
            'Other' => [1107, 12, 0, 20, 1, 11, 21]
        ]
    ],
    'fringe case' => [
        'DC' => [
            'IT' => [],
            'DE' => ['', '', '', 99],
            'Other' => ['', 99]
        ]
    ]
];

array_walk(
    $array,
    fn(&$dateSet) => array_walk(
        $dateSet,
        fn(&$dcSet) => array_walk(
            $dcSet,
            function (&$set) {
                if (!$set) {
                    $set = 0;
                    return;
                }
                sort($set);
                $count = count($set);
                $mid = intdiv($count, 2);
                if ($count & 1) {
                    $set = $set[$mid];
                    return;
                }
                $set = ((int)$set[$mid - 1] + (int)$set[$mid]) / 2;
            }
        )
    )
);
var_export($array);

Output for git.master, git.master_jit: array ( '2017-05-01' => array ( 'DC' => array ( 'IT' => 45, 'DE' => 54.5, 'Other' => 24.5, ), ), '2017-05-02' => array ( 'DC' => array ( 'IT' => 55, 'DE' => 4, 'Other' => 12, ), ), 'fringe case' => array ( 'DC' => array ( 'IT' => 0, 'DE' => 0, 'Other' => 49.5, ), ), )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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