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@ 2023-04-27T22:02:40Z

<?php

$array = [
    'children' => [
        [
            'id' => 123,
            'title' => 'test',
            'children' => [
                [
                    'id' => 345,
                    'title' => 'test 1',
                    'children' => [],
                ],
                [
                    'id' => 567,
                    'title' => 'test 2',
                    'children' => [
                        [
                            'id' => 789,
                            'title' => 'test 3',
                            'children' => [],
                        ],
                        [
                            'id' => 333,
                            'title' => 'tset 4',
                            'children' => [
                                [
                                    'id' => 222,
                                    'title' => 'test 5',
                                    'children' => [],
                                ],
                                [
                                    'id' => 111,
                                    'title' => 'test 55',
                                    'children' => [],
                                ],
                                [
                                    'id' => 444,
                                    'title' => 'test 556',
                                    'children' => [],
                                ],
                                [
                                    'id' => 666,
                                    'title' => 'test44',
                                    'children' => [],
                                ],
                            ],
                        ],
                        [
                            'id' => '5556',
                            'identifier' => 'test 2',
                            'children' => [
                                [
                                    'id' => 888,
                                    'title' => 'test 2',
                                    'children' => [],
                                ],
                                [
                                    'id' => 255,
                                    'title' => 'tset',
                                    'children' => [],
                                ],
                                [
                                    'id' => 454,
                                    'title' => 'warm-up-5837',
                                    'children' => [],
                                ],
                            ],
                        ],
                    ],
                ],
            ],
        ],
    ],
];

function flattenTree(array $tree): array
{
    $flat = [];
    foreach ($tree['children'] ?? [] as $child) {
        $flat[] = array_filter($child, 'is_scalar');
        if (!empty($child['children'])) {
           array_push($flat, ...flattenTree($child, $flat));
        }
    }
    return $flat;
}
var_export(flattenTree($array));

array_push: documentation ( source)
var_export: documentation ( source)
array_filter: documentation ( source)

preferences:dark modelive previewkey bindings

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