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@ 2020-02-21T10:47:42Z

<?php

$flat = [
    ['id' => 100, 'parent_id' => 0, 'name' => 'root'],
    ['id' => 101, 'parent_id' => 100, 'name' => 'ch-1'],
    ['id' => 102, 'parent_id' => 101, 'name' => 'ch-1-1'],
    ['id' => 103, 'parent_id' => 101, 'name' => 'ch-1-2'],
    ['id' => 104, 'parent_id' => 101, 'name' => 'ch-1-2'],
    ['id' => 105, 'parent_id' => 104, 'name' => 'ch-1-2'],
    ['id' => 106, 'parent_id' => 101, 'name' => 'ch-1-2'],
    ['id' => 107, 'parent_id' => 101, 'name' => 'ch-1-2'],
];


$new = array();
foreach ($flat as $a){
    $new[$a['parent_id']][] = $a;
}
$tree = createTree($new, array($flat[0]));
print_r($tree);

function createTree(&$list, $parent){
    $tree = array();
    foreach ($parent as $k=>$l){
        if(isset($list[$l['id']])){
            $l['children'] = createTree($list, $list[$l['id']]);
        }
        $tree[] = $l;
    } 
    return $tree;
}

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 100 [parent_id] => 0 [name] => root [children] => Array ( [0] => Array ( [id] => 101 [parent_id] => 100 [name] => ch-1 [children] => Array ( [0] => Array ( [id] => 102 [parent_id] => 101 [name] => ch-1-1 ) [1] => Array ( [id] => 103 [parent_id] => 101 [name] => ch-1-2 ) [2] => Array ( [id] => 104 [parent_id] => 101 [name] => ch-1-2 [children] => Array ( [0] => Array ( [id] => 105 [parent_id] => 104 [name] => ch-1-2 ) ) ) [3] => Array ( [id] => 106 [parent_id] => 101 [name] => ch-1-2 ) [4] => Array ( [id] => 107 [parent_id] => 101 [name] => ch-1-2 ) ) ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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