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@ 2015-09-17T05:01:50Z

<?php

$comments = [
    1 => ['content' => "The first comment", 'parent' => 0],
    2 => ['content' => "The second comment", 'parent' => 0],
    3 => ['content' => "Reply of first comment", 'parent' => 1],
    4 => ['content' => "Another reply of first comemnt", 'parent' => 1],
    5 => ['content' => "Reply of a reply of the first comment", 'parent' => 4]
];


foreach($comments as $id => &$value)
{
    # check if there is a parent
    if ($parentId = $value['parent'])
    {
        $comments[$parentId][0][$id] =& $value; # add child to parent
        unset($comments[$id]); # remove reference from topmost level
    }
}
unset($value); # remove iterator reference
print_r($comments); # your tree

// foreach($comments as $id => &$c) {
//     if (isset($comments[$c['parent']])) {
//         $comments[$c['parent']]['comments'][$id] =& $c;
//         unset($comments[$id]);
//     }
// }

// var_dump($comments);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined array key "parent" in /in/4JuIa on line 15 Array ( [1] => Array ( [content] => The first comment [parent] => 0 [0] => Array ( [3] => Array ( [content] => Reply of first comment [parent] => 1 ) [4] => Array ( [content] => Another reply of first comemnt [parent] => 1 ) ) ) [2] => Array ( [content] => The second comment [parent] => 0 ) [4] => Array ( [0] => Array ( [5] => Array ( [content] => Reply of a reply of the first comment [parent] => 4 ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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