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@ 2024-01-21T07:13:05Z

<?php

$array = [
    [
        'countries' => [
            ['country_code' => 'US', 'growth' => 3.57],
            ['country_code' => 'CA', 'growth' => 4.77],
            ['country_code' => 'TT', 'growth' => 0],
        ],
        'group_name' => 'North America',
    ],
    [
        'countries' => [
            ['country_code' => 'BR', 'growth' => 2.19],
            ['country_code' => 'PE', 'growth' => 1.78],
            ['country_code' => 'UY', 'growth' => 8.83],
            ['country_code' => 'MX', 'growth' => 3.83],
        ],
        'group_name' => 'South America',
    ],
];

var_export(
    array_map(
        function ($set) {
            usort($set['countries'], fn($a, $b) => $b['growth'] <=> $a['growth']);
            return $set;
        },
        $array
    )
);

Output for git.master_jit, git.master, rfc.property-hooks: array ( 0 => array ( 'countries' => array ( 0 => array ( 'country_code' => 'CA', 'growth' => 4.77, ), 1 => array ( 'country_code' => 'US', 'growth' => 3.57, ), 2 => array ( 'country_code' => 'TT', 'growth' => 0, ), ), 'group_name' => 'North America', ), 1 => array ( 'countries' => array ( 0 => array ( 'country_code' => 'UY', 'growth' => 8.83, ), 1 => array ( 'country_code' => 'MX', 'growth' => 3.83, ), 2 => array ( 'country_code' => 'BR', 'growth' => 2.19, ), 3 => array ( 'country_code' => 'PE', 'growth' => 1.78, ), ), 'group_name' => 'South America', ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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