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@ 2019-07-18T06:02:07Z

<?php

$arr = array(
    "artists" => array(
        "1" => array(
            "id" => "1",
            "firstname" => "John",
            "lastname" => "Doe",
            "songs" => array(
                array("name" => "song_1", "year" => "1999"),
                array("name" => "song_2", "year" => "1987")
            ),
        ),
        "2" => array(
            "id" => "2",
            "firstname" => "Jane",
            "lastname" => "Doe",
            "songs" => array(
                array("name" => "song_1", "year" => "2000"),
                array("name" => "song_2", "year" => "1999")
            )
        ),
        "3" => array(
            "id" => "3",
            "firstname" => "Mark",
            "lastname" => "Doe",
            "songs" => array(
                array("name" => "song_1", "year" => "1984"),
                array("name" => "song_2", "year" => "1983")
            )
        )
    )
);

array_walk($arr['artists'], function (&$song) {
    usort($song['songs'], function ($a, $b) { return $a['year'] > $b['year'] ? 1 : -1; }); // Ascending order
    //usort($song['songs'], function ($a, $b) { return $a['year'] < $b['year'] ? 1 : -1; }); // Descending order
});

print('<pre>');
print_r($arr);
print('</pre>');

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [artists] => Array ( [1] => Array ( [id] => 1 [firstname] => John [lastname] => Doe [songs] => Array ( [0] => Array ( [name] => song_2 [year] => 1987 ) [1] => Array ( [name] => song_1 [year] => 1999 ) ) ) [2] => Array ( [id] => 2 [firstname] => Jane [lastname] => Doe [songs] => Array ( [0] => Array ( [name] => song_2 [year] => 1999 ) [1] => Array ( [name] => song_1 [year] => 2000 ) ) ) [3] => Array ( [id] => 3 [firstname] => Mark [lastname] => Doe [songs] => Array ( [0] => Array ( [name] => song_2 [year] => 1983 ) [1] => Array ( [name] => song_1 [year] => 1984 ) ) ) ) ) </pre>

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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