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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);

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.26, 8.4.1 - 8.4.13: Array ( [0] => Array ( [id] => 1 [children] => Array ( [0] => Array ( [id] => 6 [children] => Array ( [0] => Array ( [id] => 7 ) [1] => Array ( [id] => 8 ) ) [level] => 2 ) [1] => Array ( [id] => 9 ) ) [level] => 1 ) [1] => Array ( [id] => 2 [children] => Array ( [0] => Array ( [id] => 10 ) [1] => Array ( [id] => 13 [children] => Array ( [0] => Array ( [id] => 14 ) [1] => Array ( [id] => 19 [children] => Array ( [0] => Array ( [id] => 20 ) [1] => Array ( [id] => 21 ) [2] => Array ( [id] => 22 ) [3] => Array ( [id] => 23 ) ) [level] => 3 ) ) [level] => 2 ) ) [level] => 1 ) )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => Array ( [id] => 1 [children] => Array ( [0] => Array ( [id] => 6 [children] => Array ( [0] => Array ( [id] => 7 ) [1] => Array ( [id] => 8 ) ) [level] => 2 ) [1] => Array ( [id] => 9 ) ) [level] => 1 ) [1] => Array ( [id] => 2 [children] => Array ( [0] => Array ( [id] => 10 ) [1] => Array ( [id] => 13 [children] => Array ( [0] => Array ( [id] => 14 ) [1] => Array ( [id] => 19 [children] => Array ( [0] => Array ( [id] => 20 ) [1] => Array ( [id] => 21 ) [2] => Array ( [id] => 22 ) [3] => Array ( [id] => 23 ) ) [level] => 3 ) ) [level] => 2 ) ) [level] => 1 ) )

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