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@ 2023-12-21T22:31:55Z

<?php

$array = [
    [
        'parent' => 'Basic',
        'parentId' => 1,
        'child' => 'Birthday',
        'childId' => 2,
    ],
    [
        'parent' => 'Basic',
        'parentId' => 1,
        'child' => 'Gender',
        'childId' => 3,
    ],
    [
        'parent' => 'Geo',
        'parentId' => 10,
        'child' => 'Current City',
        'childId' => 11,
    ],
    [
        'parent' => 'Known me',
        'parentId' => 5,
        'child' => 'My personality',
        'childId' => 7,
    ],
    [
        'parent' => 'Known me',
        'parentId' => 5,
        'child' => 'Best life moment',
        'childId' => 8,
    ],
];

$result = [];
foreach ($array as $row) {
    if (!isset($result[$row['parentId']])) {
        unset($row['childId']);
        $row['child'] = (array) $row['child'];
        $result[$row['parentId']] = $row;
    } else {
        $result[$row['parentId']]['child'][] = $row['child'];
    }
}
var_export(array_values($result));

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'parent' => 'Basic', 'parentId' => 1, 'child' => array ( 0 => 'Birthday', 1 => 'Gender', ), ), 1 => array ( 'parent' => 'Geo', 'parentId' => 10, 'child' => array ( 0 => 'Current City', ), ), 2 => array ( 'parent' => 'Known me', 'parentId' => 5, 'child' => array ( 0 => 'My personality', 1 => 'Best life moment', ), ), )

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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

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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