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@ 2019-10-05T12:06:37Z

<?php

function replaceParent(&$array, $parent = null) {
    foreach ($array as &$item) {
        if ($item['id'] == $parent) {
            if ($item['parent']) {
                return replaceParent($array, $item['parent']);
            } else {
                return $item['id'];
            }
        } elseif ($item['parent']) {
            $item['parent'] = replaceParent($array, $item['parent']);
        }
    }
}
$array = [
    '0' => [
        'id' => 1,
        'parent' => 0,
        'name' => 'root 0'
    ],
    '1' => [
        'id' => 2,
        'parent' => 1,
        'name' => 'root 1'
    ],
    '2' => [
        'id' => 3,
        'parent' => 2,
        'name' => 'root 2'
    ],
    '3' => [
        'id' => 4,
        'parent' => 3,
        'name' => 'root 3'
    ],
    '4' => [
        'id' => 5,
        'parent' => 3,
        'name' => 'root 4'
    ],
    '5' => [
        'id' => 6,
        'parent' => 2,
        'name' => 'root 2'
    ]
];

replaceParent($array);
var_export($array);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'id' => 1, 'parent' => 0, 'name' => 'root 0', ), 1 => array ( 'id' => 2, 'parent' => 1, 'name' => 'root 1', ), 2 => array ( 'id' => 3, 'parent' => 1, 'name' => 'root 2', ), 3 => array ( 'id' => 4, 'parent' => 1, 'name' => 'root 3', ), 4 => array ( 'id' => 5, 'parent' => 1, 'name' => 'root 4', ), 5 => array ( 'id' => 6, 'parent' => 1, 'name' => 'root 2', ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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