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@ 2018-09-21T00:47:24Z

<?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]
        ]
    ]
];

foreach ($array as &$lv1) {
    foreach ($lv1 as &$lv2) {
        foreach ($lv2 as &$lv3) {
            sort($lv3);                  // order values ASC
            $count = sizeof($lv3);       // count number of values
            $index = floor($count / 2);  // get middle index or upper of middle two
            if (!$count) {               // count is zero
                $lv3 = 0;
            } elseif ($count & 1) {      // count is odd
                $lv3 = (int)$lv3[$index];                        // single median
            } else {                     // count is even
                $lv3 = ((int)$lv3[$index-1] + (int)$lv3[$index]) / 2; // dual median
            }
        }
    }
}
var_export($array);

Output for git.master, git.master_jit, rfc.property-hooks: 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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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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