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@ 2013-11-25T14:12:48Z

<?php

$tree = array(
   1 => array(
       'parent_id' => null,
       'name' => 'root',
       'depth' => 0,
   ),
   11 => array(
       'parent_id' => 1,
       'name' => 'a',
       'depth' => 1,
   ),
   12 => array(
       'parent_id' => 1,
       'name' => 'b',
       'depth' => 1,
   ),
   111 => array(
       'parent_id' => 11,
       'name' => 'aa',
       'depth' => 2,
   ),
   2 => array(
       'parent_id' => null,
       'name' => 'other root',
       'depth' => 0,
   )
);

foreach ($tree as $key => &$sub) {
    if (isset($sub['parent_id'])) {
        $tree[$sub['parent_id']]['children'][$key] = &$sub;
    }
}
unset($sub); // unset the reference to make sure to not overwrite it later...

// now remove the entries with parents
foreach ($tree as $key => $sub) {
    if (isset($sub['parent_id'])) 
        unset($tree[$key]);
}
var_dump($tree);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [1]=> array(4) { ["parent_id"]=> NULL ["name"]=> string(4) "root" ["depth"]=> int(0) ["children"]=> array(2) { [11]=> array(4) { ["parent_id"]=> int(1) ["name"]=> string(1) "a" ["depth"]=> int(1) ["children"]=> array(1) { [111]=> array(3) { ["parent_id"]=> int(11) ["name"]=> string(2) "aa" ["depth"]=> int(2) } } } [12]=> array(3) { ["parent_id"]=> int(1) ["name"]=> string(1) "b" ["depth"]=> int(1) } } } [2]=> array(3) { ["parent_id"]=> NULL ["name"]=> string(10) "other root" ["depth"]=> int(0) } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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