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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));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'id' => 123, 'title' => 'test', ), 1 => array ( 'id' => 345, 'title' => 'test 1', ), 2 => array ( 'id' => 567, 'title' => 'test 2', ), 3 => array ( 'id' => 789, 'title' => 'test 3', ), 4 => array ( 'id' => 333, 'title' => 'tset 4', ), 5 => array ( 'id' => 222, 'title' => 'test 5', ), 6 => array ( 'id' => 111, 'title' => 'test 55', ), 7 => array ( 'id' => 444, 'title' => 'test 556', ), 8 => array ( 'id' => 666, 'title' => 'test44', ), 9 => array ( 'id' => '5556', 'identifier' => 'test 2', ), 10 => array ( 'id' => 888, 'title' => 'test 2', ), 11 => array ( 'id' => 255, 'title' => 'tset', ), 12 => array ( 'id' => 454, 'title' => 'warm-up-5837', ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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