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@ 2018-04-06T00:09:28Z

<?php

function setTier(array $nodes, $tier = 1)
{
    return array_map(function ($node) use ($tier) {
        $node->tier = $tier;
        $node->children = setTier($node->children, $tier + 1);

        return $node;
    }, $nodes);
}

$structure = json_decode('
    [{
        "name": "a",
        "children": [{
            "name": "c",
            "children": [{
                "name": "e",
                "children": [{
                    "name": "g",
                    "children": []
                }]
            }, {
                "name": "f",
                "children": []
            }]
        }, {
            "name": "d",
            "children": [{
                "name": "h",
                "children": []
            }]
        }]
    }, {
        "name": "b",
        "children": []
    }]
');

$structure = setTier($structure);

print_r($structure); die;

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => stdClass Object ( [name] => a [children] => Array ( [0] => stdClass Object ( [name] => c [children] => Array ( [0] => stdClass Object ( [name] => e [children] => Array ( [0] => stdClass Object ( [name] => g [children] => Array ( ) [tier] => 4 ) ) [tier] => 3 ) [1] => stdClass Object ( [name] => f [children] => Array ( ) [tier] => 3 ) ) [tier] => 2 ) [1] => stdClass Object ( [name] => d [children] => Array ( [0] => stdClass Object ( [name] => h [children] => Array ( ) [tier] => 3 ) ) [tier] => 2 ) ) [tier] => 1 ) [1] => stdClass Object ( [name] => b [children] => Array ( ) [tier] => 1 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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