3v4l.org

run code in 300+ PHP versions simultaneously

@ 2021-04-09T03:34:16Z

<?php

$array = array(
    array(
        'id' => 1,
        'children' => array(
            array(
                'id' => 6,
                'children' => array(
                    array(
                        'id' => 7,
                    ),
                    array(
                        'id' => 8,
                    )
                ),
                // Expected
                // 'level' => '2',
            ),
            array(
                'id' => 9,
            )
        ),
        // Expected
        //'level' => '1'
    ),
    array(
        'id' => 2,
        'children' => array(
            array(
                'id' => 10,
            ),
            array(
                'id' => 13,
                'children' => array(
                    array(
                        'id' => 14,
                    ),
                    array(
                        'id' => 19,
                        'children' => array(
                          array(
                              'id' => 20,
                          ),
                          array(
                              'id' => 21,
                          ),
                          array(
                              'id' => 22,
                          ),
                          array(
                              'id' => 23,
                          ),
                        ),
                        // Expected
                        //'level' => '3'
                    )
                ),
                // Expected
                //'level' => '2'
            ),
        ),
        // Expected
        //'level' => '1'
    )
);

function updateTreeArray(&$array, $level = 1) {
    foreach($array as &$item) {
        if (array_key_exists('children', $item) && is_array($item['children'])) {
            $item['level'] = $level;
            updateTreeArray($item['children'], $level + 1);
        }
    }
}

updateTreeArray($array);

print_r($array);

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