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@ 2019-04-14T19:16:33Z

<?php

$arr = array
(
    "100" => array(
        array(
            "country" => 'France',
            "city" => 'Paris',
            "population" => '1800000',
        ),
        array(
            "country" => 'France',
            "city" => 'Paris',
            "population" => '2000000',
        ),
        array(
            "country" => 'France',
            "city" => 'Toulouse',
            "population" => '500000',
        ),
    ),
    "101" => array(
        array(
            "country" => 'Russia',
            "population" => '144000000',
        )
    )
);


foreach($arr as $key => $sub){
    foreach($sub as $item){
        if(isset($item['city'])){
            if(!isset($res[$key][$item['country'] . $item['city']])) $res[$key][$item['country'] . $item['city']] = $item;
            if($res[$key][$item['country'] . $item['city']] < $item['population']) $res[$key][$item['country'] . $item['city']] = $item;
        }else{
            if(!isset($res[$key][$item['country']])) $res[$key][$item['country']] = $item;
            if($res[$key][$item['country']] < $item['population']) $res[$key][$item['country']] = $item;
        }
    }
}
var_dump($res);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [100]=> array(2) { ["FranceParis"]=> array(3) { ["country"]=> string(6) "France" ["city"]=> string(5) "Paris" ["population"]=> string(7) "1800000" } ["FranceToulouse"]=> array(3) { ["country"]=> string(6) "France" ["city"]=> string(8) "Toulouse" ["population"]=> string(6) "500000" } } [101]=> array(1) { ["Russia"]=> array(2) { ["country"]=> string(6) "Russia" ["population"]=> string(9) "144000000" } } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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