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@ 2013-10-11T16:01:26Z

<?php

$array = array(
   55 => array(
       'ident' => 'test 1',
       'depth' => 1,
   ),
   77 => array(
       'parent_id' => 55,
       'ident' => 'test 2',
       'depth' => 2,
   ),
   109 => array(
       'parent_id' => 77,
       'ident' => 'test 3',
       'depth' => 3,
   ),
   78 => array(
       'parent_id' => 55,
       'ident' => 'test 4',
       'depth' => 2,
   ),
   25 => array(
       'ident' => 'test 5',
       'depth' => 1,
   )
);

function v1($array) {
    foreach ($array as $key => &$sub) {
        if (isset($sub['parent_id'])) {
            $array[$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 ($array as $key => $sub) {
        if (isset($sub['parent_id'])) 
            unset($array[$key]);
    }

    return $array;
}

var_dump(v1($array));

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(2) { [77]=> array(4) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 2" ["depth"]=> int(2) ["children"]=> array(1) { [109]=> array(3) { ["parent_id"]=> int(77) ["ident"]=> string(6) "test 3" ["depth"]=> int(3) } } } [78]=> array(3) { ["parent_id"]=> int(55) ["ident"]=> string(6) "test 4" ["depth"]=> int(2) } } } [25]=> array(2) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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