Online PHP editor | output for KNuId

@ 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 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: 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" } } }
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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