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run code in 300+ PHP versions simultaneously

@ 2017-04-17T09:22:37Z

<?php

$tree = [
    0 => [
        'name' => 'root',
        'data' => 0,
        'children' => [
            '1' => [
                'name' => 'Auto',
                'data' => 0,
                'children' => [
                    '2' => [
                        'name' => 'Tyres',
                        'data' => 0,
                        'children' => [],
                    ],
                    '3' => [
                        'name' => 'Audio',
                        'data' => 1,
                        'children' => [],
                    ],
                ],
            ],
            '4' => [
                'name' => 'Dishes',
                'data' => 0,
                'children' => [
                    '5' => [
                        'name' => 'Forks',
                        'data' => 0,
                        'children' => [],
                    ],
                    '6' => [
                        'name' => 'Knives',
                        'data' => 0,
                        'children' => [
                            '7' => [
                                'name' => 'Stainless steel',
                                'data' => 0,
                                'children' => [],
                            ],
                            '8' => [
                                'name' => 'Silver',
                                'data' => 0,
                                'children' => [],
                            ],
                        ],
                    ],
                ],
            ],
        ]
    ]
];
#var_dump($tree);

function reduceTree($tree)
{
    foreach ($tree['children'] as $key => $value) {
        if ($value['children']) {
            $tree['children'][$key] = reduceTree($value);
        }

        if (!$tree['data']) {
            unset($tree['children'][$key]);
        }
    }
    return $tree;
}

$new = reduceTree($tree[0]);
var_dump($new);

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 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: array(3) { ["name"]=> string(4) "root" ["data"]=> int(0) ["children"]=> array(0) { } }

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