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@ 2021-10-05T17:53:47Z

<?php

$menu = [
    0 => [
      'id' => 1,
      'parent_id' => 0,
      'title' => 'Category 1',
    ],
    2 => [
      'id' => 2,
      'parent_id' => 0,
      'title' => 'Category 2',
    ],
    3 => [
      'id' => 3,
      'parent_id' => 2,
      'title' => 'Category 3',
    ],
    4 => [
      'id' => 4,
      'parent_id' => 3,
      'title' => 'Category 4',
    ]
];

function appendItem(array &$haystack, array $toAppend): void
{
    foreach ($haystack as &$menuItem) {
        if ($menuItem['id'] === $toAppend['parent_id']) {
            if (array_key_exists('child', $menuItem)) {
                $menuItem['child'][] = $toAppend;
            } else {
                $menuItem['child'] = [$toAppend];
            }
            return;
        } 
        if (array_key_exists('child', $menuItem)) {
            appendItem($menuItem['child'], $toAppend);
        }
    }
}

foreach ($menu as $key => $menuItem) {
    if ($menuItem['parent_id'] !== 0) {
        unset($menu[$key]);
        appendItem($menu, $menuItem);
    }
}

var_dump($menu);

Output for rfc.property-hooks, git.master, git.master_jit: array(2) { [0]=> array(3) { ["id"]=> int(1) ["parent_id"]=> int(0) ["title"]=> string(10) "Category 1" } [2]=> array(4) { ["id"]=> int(2) ["parent_id"]=> int(0) ["title"]=> string(10) "Category 2" ["child"]=> array(1) { [0]=> array(4) { ["id"]=> int(3) ["parent_id"]=> int(2) ["title"]=> string(10) "Category 3" ["child"]=> array(1) { [0]=> array(3) { ["id"]=> int(4) ["parent_id"]=> int(3) ["title"]=> string(10) "Category 4" } } } } } }

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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