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@ 2020-04-25T23:58:28Z

<?php

$input = array (
    'expanded' => 1,
    'key' => 'root_1',
    'title' => 'root',
    'children' => 
    array (
        0 => 
        array (
            'folder' => 1,
            'key' => 34,
            'title' => 'YAY PROJECTS'
        ),
        1 => 
        array (
            'expanded' => 1,
            'folder' => 1,
            'key' => 6,
            'title' => 'Grand Designs Episodes',
            'children' => 
            array (
                0 => 
                array (
                    'folder' => 1,
                    'key' => 8,
                    'title' => 'AU Episodes'
                ),
                1 => 
                array (
                    'expanded' => 1,
                    'folder' => 1,
                    'key' => 7,
                    'title' => 'UK Episodes',
                    'children' => 
                    array (
                        0 => 
                        array (
                            'key' => 9,
                            'title' => 'Start something'
                        ),
                        1 => 
                        array (
                            'key' => 2,
                            'title' => 'Grand Designs Season 10'
                        ),
                    ),
                )
            )
        ),
        2 => 
            array (
                'expanded' => 1,
                'folder' => 1,
                'key' => 5,
                'title' => 'Animations',
                'children' => 
                    array (
                        0 => 
                        array (
                            'key' => 4,
                            'title' => 'Futurama Episode 191'
                        ),
                        1 => 
                        array (
                            'key' => 3,
                            'title' => 'Miniscule Series 5 Ep1'
                        ),
                        2 => 
                        array (
                            'key' => 1,
                            'title' => 'The Simpsons Episode 459'
                        )
                    )
                ),
                    
        3 => 
            array (
                'folder' => 1,
                'key' => 11,
                'title' => 'Test Folder'
            ),
        4 => 
            array (
                'folder' => 1,
                'key' => 10,
                'title' => 'Testing'
            )
        )
);

function generateParentIds(&$input, $parentId = 0) {
    $input['parent_id'] = $parentId;
    if (isset($input['children'])) {
        foreach ($input['children'] as &$child) {
            generateParentIds($child, $input['key']);
        }
    }
}

generateParentIds($input);
print_r($input);

print_r: documentation ( source)

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