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@ 2023-04-12T22:26:27Z

<?php

$array = [
    [
        'id' => 67941,
        'parent_id' => 0,
        'name' => 'Requirement',
        'children' => [
            [
                'id' => 67942,
                'parent_id' => 67941,
                'name' => 'Sub Requirement',
                'children' => [
                    [
                        'id' => 67943,
                        'parent_id' => 67942,
                        'name' => 'Sub Sub Requirement',
                    ],
                ],
            ],
        ],
    ],
    [
        'id' => 67977,
        'parent_id' => 0,
        'name' => 'Requirement',
        'children' => [
            [
                'id' => 67978,
                'parent_id' => 67977,
                'name' => 'Sub Requirement',
                'children' => [
                    [
                        'id' => 67979,
                        'parent_id' => 67978,
                        'name' => 'Sub Sub Requirement',
                        'children' => [
                            [
                                'id' => 67980,
                                'parent_id' => 67979,
                                'name' => 'Sub Sub Sub Requirement',
                            ],
                        ],
                    ],
                ],
            ],
        ],
    ],
];
$needle = 67943;

$ritit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
$result = null;
foreach ($ritit as $leafValue) {
    $path = [];
    foreach (range(0, $ritit->getDepth()) as $depth) {
        $obj = $ritit->getSubIterator($depth);
        $key = $obj->key();
        if ($key !== 'children') {
            $path[] = $key;
        }
        if ($obj->current() === $needle) {
            $result = $path;
            break 2;
        }

    }
}
var_export($result);

Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: array ( 0 => 0, 1 => 0, 2 => 0, 3 => 'id', )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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