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@ 2021-06-17T13:18:23Z

<?php

$arr = [
    [
        "id"      => "127",
        "title"   => "Apple",
        "deleted" => "0",
        "parent"  => NULL,
        "usp_id"  => "445",
        "user_id" => NULL,
    ],
    [
        "id"      => "159",
        "title"   => "Renault Duster",
        "deleted" => "0",
        "parent"  => NULL,
        "usp_id"  => "495",
        "user_id" => NULL,
    ],
    [
        "id"      => "7",
        "title"   => "Services",
        "deleted" => "0",
        "parent"  => "127",
        "usp_id"  => "79",
        "user_id" => "275",
    ],
];

foreach ($arr as $key0 => $record) {
    if (null !== $record['parent']) {
        foreach ($arr as $key1 => $parent) {
            if ($parent['id'] === $record['parent']) {
                $arr[$key1]['children'][] = $record; // push child into parent['sub']
                unset($arr[$key0]); // delete child
            }
        }
    }
}

print_r($arr);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 127 [title] => Apple [deleted] => 0 [parent] => [usp_id] => 445 [user_id] => [children] => Array ( [0] => Array ( [id] => 7 [title] => Services [deleted] => 0 [parent] => 127 [usp_id] => 79 [user_id] => 275 ) ) ) [1] => Array ( [id] => 159 [title] => Renault Duster [deleted] => 0 [parent] => [usp_id] => 495 [user_id] => ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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