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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 7.1.25 - 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 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9: <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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