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@ 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 git.master, git.master_jit, rfc.property-hooks: 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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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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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