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@ 2022-01-08T16:28:39Z

<?php
$rows = [
    [
        'id' => '1',
        'file' => 'file_1_no_subfolder.doc',
        'parent_id' => 0,
    ],
    [
        'id' => '2',
        'file' => 'file_2_no_subfolder.doc',
        'parent_id' => 0,
    ],
    [
        'id' => '3',
        'file' => 'folder-1',
        'parent_id' => 0,
    ],
    [
        'id' => '4',
        'file' => 'folder-1_file_1.doc',
        'parent_id' => 3,
    ],
    [
        'id' => '5',
        'file' => 'folder-1_file_2.doc',
        'parent_id' => 3,
    ],
    [
        'id' => '6',
        'file' => 'folder-1_file_3.doc',
        'parent_id' => 3,
    ],
    [
        'id' => '7',
        'file' => 'folder-2',
        'parent_id' => 0,
    ],
    [
        'id' => 8,
        'file' => 'folder-2_file-1.doc',
        'parent_id' => 7,
    ],
    [
        'id' => 9,
        'file' => 'folder-2_file-1.doc',
        'parent_id' => 7,
    ],
    [
        'id' => 10,
        'file' => 'folder-2_file-1.doc',
        'parent_id' => 7,
    ],
];

function buildTree(array $elements, $parentId = 0) {
    $branch = array();

    foreach ($elements as $element) {
        if ($element['parent_id'] == $parentId) {
            $children = buildTree($elements, $element['id']);
            if ($children) {
                $element['children'] = $children;
            }
            $branch[] = $element;
        }
    }

    return $branch;
}

$tree = buildTree($rows);

print_r( $tree );

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 1 [file] => file_1_no_subfolder.doc [parent_id] => 0 ) [1] => Array ( [id] => 2 [file] => file_2_no_subfolder.doc [parent_id] => 0 ) [2] => Array ( [id] => 3 [file] => folder-1 [parent_id] => 0 [children] => Array ( [0] => Array ( [id] => 4 [file] => folder-1_file_1.doc [parent_id] => 3 ) [1] => Array ( [id] => 5 [file] => folder-1_file_2.doc [parent_id] => 3 ) [2] => Array ( [id] => 6 [file] => folder-1_file_3.doc [parent_id] => 3 ) ) ) [3] => Array ( [id] => 7 [file] => folder-2 [parent_id] => 0 [children] => Array ( [0] => Array ( [id] => 8 [file] => folder-2_file-1.doc [parent_id] => 7 ) [1] => Array ( [id] => 9 [file] => folder-2_file-1.doc [parent_id] => 7 ) [2] => Array ( [id] => 10 [file] => folder-2_file-1.doc [parent_id] => 7 ) ) ) )

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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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