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@ 2015-12-29T16:13:21Z

<?php

$array = [
    [
        'name'     => 'Foo',
        'children' => [
            [
                'name'     => 'B',
                'children' => []
            ],
            [
                'name'     => 'A',
                'children' => []
            ]
        ]
    ],
    [
        'name'     => 'Bar',
        'children' => [
            [
                'name'     => 'Z',
                'children' => []
            ],
            [
                'name'     => 'X',
                'children' => []
            ],
            [
                'name'     => 'Y',
                'children' => []
            ]
        ]
    ]
];

array_usort($array, $f = function(&$x, &$y) use (&$f){
    array_usort($x['children'], $f);
    array_usort($y['children'], $f);
    return strcasecmp($x['name'], $y['name']);
});

var_dump($array);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function array_usort() in /in/55FF6:36 Stack trace: #0 {main} thrown in /in/55FF6 on line 36
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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