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@ 2021-11-30T21:40:25Z

<?php

$arr = [
    [ 'TYPE' => 'Answer', 'PARTY_ID' => 115, 'PARENT_USER_CONTENT_ID' => 114 ],
    [ 'TYPE' => 'Question', 'PARTY_ID' => 112, 'PARENT_USER_CONTENT_ID' => '' ],
    [ 'TYPE' => 'Question', 'PARTY_ID' => 113, 'PARENT_USER_CONTENT_ID' => '' ],
    [ 'TYPE' => 'Answer', 'PARTY_ID' => 116, 'PARENT_USER_CONTENT_ID' => 113 ],
    [ 'TYPE' => 'Question', 'PARTY_ID' => 114, 'PARENT_USER_CONTENT_ID' => '' ],
    [ 'TYPE' => 'Answer', 'PARTY_ID' => 117, 'PARENT_USER_CONTENT_ID' => 112 ]
];

$indexed = array_combine(array_column($arr, 'PARTY_ID'), $arr);
$answers = array_flip(array_filter(array_column($arr, 'PARENT_USER_CONTENT_ID', 'PARTY_ID')));

foreach ($answers as $parentPartyId => $childPartyId) {
  $result[] = array_merge($indexed[$parentPartyId], [ 'ANSWER' => $indexed[$childPartyId]]);
}

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [TYPE] => Question [PARTY_ID] => 114 [PARENT_USER_CONTENT_ID] => [ANSWER] => Array ( [TYPE] => Answer [PARTY_ID] => 115 [PARENT_USER_CONTENT_ID] => 114 ) ) [1] => Array ( [TYPE] => Question [PARTY_ID] => 113 [PARENT_USER_CONTENT_ID] => [ANSWER] => Array ( [TYPE] => Answer [PARTY_ID] => 116 [PARENT_USER_CONTENT_ID] => 113 ) ) [2] => Array ( [TYPE] => Question [PARTY_ID] => 112 [PARENT_USER_CONTENT_ID] => [ANSWER] => Array ( [TYPE] => Answer [PARTY_ID] => 117 [PARENT_USER_CONTENT_ID] => 112 ) ) )

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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