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@ 2017-07-13T12:34:44Z

<?php

$array = [
    [
        'id' => 1,
        'title' => 'dir 1',
        'parent_id' => 0,
    ],
    [
        'id' => 2,
        'title' => 'dir 2',
        'parent_id' => 0,
    ],
    [
        'id' => 3,
        'title' => 'dir 3',
        'parent_id' => 2,
    ],
    [
        'id' => 4,
        'title' => 'dir 4',
        'parent_id' => 3,
    ],
    [
        'id' => 5,
        'title' => 'dir 5',
        'parent_id' => 6,
    ],
    [
        'id' => 6,
        'title' => 'dir 6',
        'parent_id' => 0,
    ],
];

function build_tree($array, $parent_id = 0)
{
    $result = [];
    foreach ($array as $item) {
        if ($item['parent_id'] == $parent_id) {
            $new_item = $item;
            $new_item['children'] = build_tree($array, $new_item['id']);
            $result[] = $new_item;
        }
    }
    return $result;
}

$tree = build_tree($array);

print_r($tree);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 1 [title] => dir 1 [parent_id] => 0 [children] => Array ( ) ) [1] => Array ( [id] => 2 [title] => dir 2 [parent_id] => 0 [children] => Array ( [0] => Array ( [id] => 3 [title] => dir 3 [parent_id] => 2 [children] => Array ( [0] => Array ( [id] => 4 [title] => dir 4 [parent_id] => 3 [children] => Array ( ) ) ) ) ) ) [2] => Array ( [id] => 6 [title] => dir 6 [parent_id] => 0 [children] => Array ( [0] => Array ( [id] => 5 [title] => dir 5 [parent_id] => 6 [children] => Array ( ) ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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