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@ 2023-10-27T20:51:56Z

<?php

$array = [
    [
        2 => 'kategorie_01',
        'tags' => [
            1 => 'tag_01',
            2 => 'tag_02',
        ],
    ],
    [
        3 => 'kategorie_02',
        'tags' => [
            2 => 'tag_02',
        ],
    ],
    [
        1 => 'Default',
        'tags' => [
            1 => 'tag_01',
            2 => 'tag_02',
        ],
    ],
    [
        2 => 'kategorie_01',
        'tags' => [
            2 => 'tag_02',
            3 => 'tag_03',
        ],
    ],
];

$result = [];
foreach ($array as $set) {
    foreach ($set as $k => $v) {
        if ($k !== 'tags') {
            $cat = $v;
            if (!isset($ref[$v])) {
                $ref[$v] = $set;
                $result[] = &$ref[$v];
            }
        } else {
            $ref[$cat]['tags'] += $v;
        }
    }
}
var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 2 => 'kategorie_01', 'tags' => array ( 1 => 'tag_01', 2 => 'tag_02', 3 => 'tag_03', ), ), 1 => array ( 3 => 'kategorie_02', 'tags' => array ( 2 => 'tag_02', ), ), 2 => array ( 1 => 'Default', 'tags' => array ( 1 => 'tag_01', 2 => 'tag_02', ), ), )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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