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@ 2013-11-25T14:13:49Z

<?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(json_encode($tree));

Output for git.master, git.master_jit, rfc.property-hooks: string(256) "{"1":{"parent_id":null,"name":"root","depth":0,"children":{"11":{"parent_id":1,"name":"a","depth":1,"children":{"111":{"parent_id":11,"name":"aa","depth":2}}},"12":{"parent_id":1,"name":"b","depth":1}}},"2":{"parent_id":null,"name":"other root","depth":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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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