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@ 2022-10-19T11:32:21Z

<?php

$citiesJson = <<<JSON
[{"id":"AA0","name":"Aalen","region":"Süden","state":"Baden-Württemberg"},
{"id":"AB0","name":"Aschaffenburg","region":"Mitte","state":"Bayern"},
{"id":"AC0","name":"Aachen","region":"Westen","state":"Nordrhein-Westfalen"},
{"id":"WIT","name":"Witten","region":"Westen","state":"Nordrhein-Westfalen"},
{"id":"DN0","name":"Düren","region":"Westen","state":"Nordrhein-Westfalen"}]
JSON;

$cities = json_decode($citiesJson, true);

$cities = array_map(function(array $city) {
    $city['city_region_state'] = sprintf(
        '%s, %s, %s',
        $city['name'],
        $city['region'],
        $city['state']
    );
    
    return $city;
}, $cities);

$citiesByState = array_reduce($cities, function(array $found, array $city) {
    $found[$city['state']][] = $city;
    
    return $found;
}, []);

echo json_encode($citiesByState, JSON_PRETTY_PRINT);

Output for git.master, git.master_jit, rfc.property-hooks: { "Baden-W\u00fcrttemberg": [ { "id": "AA0", "name": "Aalen", "region": "S\u00fcden", "state": "Baden-W\u00fcrttemberg", "city_region_state": "Aalen, S\u00fcden, Baden-W\u00fcrttemberg" } ], "Bayern": [ { "id": "AB0", "name": "Aschaffenburg", "region": "Mitte", "state": "Bayern", "city_region_state": "Aschaffenburg, Mitte, Bayern" } ], "Nordrhein-Westfalen": [ { "id": "AC0", "name": "Aachen", "region": "Westen", "state": "Nordrhein-Westfalen", "city_region_state": "Aachen, Westen, Nordrhein-Westfalen" }, { "id": "WIT", "name": "Witten", "region": "Westen", "state": "Nordrhein-Westfalen", "city_region_state": "Witten, Westen, Nordrhein-Westfalen" }, { "id": "DN0", "name": "D\u00fcren", "region": "Westen", "state": "Nordrhein-Westfalen", "city_region_state": "D\u00fcren, Westen, Nordrhein-Westfalen" } ] }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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