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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 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: 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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