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@ 2020-02-16T07:42:23Z

<?php

$array = array(
    "Africa" => array(
        "Egypt" => array(
            "20" => array(
                "basicInfo" => array('population' => 663, 'size' => 23)
            )
        ),
        "Sudan" => array(
            "249" => array(
                "basicInfo" => array('population' => 777, 'size' => 45)
            )
        )
    ),
    "Europe" => array(
        "Greece" => array(
            "30" => array(
                "basicInfo" => array('population' => 12345, 'size' => 97)
            )
        ),
        "Netherlands" => array(
            "31" => array(
                "basicInfo" => array('population' => 2222, 'size' => 33)
            )
        )
    )
);

$array = array_map(function ($arr) {
    uasort($arr, function ($a, $b) {
        return current($b)['basicInfo']['population'] - current($a)['basicInfo']['population'];
    });
    return $arr;
}, $array);
print_r($array);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [Africa] => Array ( [Sudan] => Array ( [249] => Array ( [basicInfo] => Array ( [population] => 777 [size] => 45 ) ) ) [Egypt] => Array ( [20] => Array ( [basicInfo] => Array ( [population] => 663 [size] => 23 ) ) ) ) [Europe] => Array ( [Greece] => Array ( [30] => Array ( [basicInfo] => Array ( [population] => 12345 [size] => 97 ) ) ) [Netherlands] => Array ( [31] => Array ( [basicInfo] => Array ( [population] => 2222 [size] => 33 ) ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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