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@ 2021-04-02T16:14:10Z

<?php

$arr = [
    ['comment_id' => 32, 'article_id' => 5, 'parent_id' => 31, 'user_id' => 22, 'content' => 'dolor sit amet consectetur adipisicing', 'created_at' => '02-04-2021'],
    ['comment_id' => 30, 'article_id' => 5, 'parent_id' => 29, 'user_id' => 22, 'content' => 'Lorem ipsum dolor sit amet.', 'created_at' => '01-04-2021'],
    ['comment_id' => 31, 'article_id' => 5, 'parent_id' => 29, 'user_id' => 22, 'content' => 'Sit amet consectetur adipisicing', 'created_at' => '02-04-2021'],
    ['comment_id' => 29, 'article_id' => 5, 'parent_id' => 0, 'user_id' => 22, 'content' => 'dolor sit amet consectetur adipisicing', 'created_at' => '01-04-2021']
];

$arr_by_comment_id = array_column($arr, null, 'comment_id');

$root_entry = null;
foreach ($arr_by_comment_id as &$entry) {
    if ($entry['parent_id'] === 0) {
        $root_entry =& $entry;
    } elseif (array_key_exists($entry['parent_id'], $arr_by_comment_id)) {
        $arr_by_comment_id[$entry['parent_id']]['comments'][] = $entry;
    }
}
unset($entry);  // For safety (after reference looping)

print_r($root_entry);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [comment_id] => 29 [article_id] => 5 [parent_id] => 0 [user_id] => 22 [content] => dolor sit amet consectetur adipisicing [created_at] => 01-04-2021 [comments] => Array ( [0] => Array ( [comment_id] => 30 [article_id] => 5 [parent_id] => 29 [user_id] => 22 [content] => Lorem ipsum dolor sit amet. [created_at] => 01-04-2021 ) [1] => Array ( [comment_id] => 31 [article_id] => 5 [parent_id] => 29 [user_id] => 22 [content] => Sit amet consectetur adipisicing [created_at] => 02-04-2021 [comments] => Array ( [0] => Array ( [comment_id] => 32 [article_id] => 5 [parent_id] => 31 [user_id] => 22 [content] => dolor sit amet consectetur adipisicing [created_at] => 02-04-2021 ) ) ) ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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