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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 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 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.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Fatal error: Call to undefined function array_usort() in /in/55FF6 on line 36
Process exited with code 255.

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