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@ 2022-11-08T22:35:26Z

<?php

$array = [
    [
        'product'   => [
            'value' => 'basic',
            'label' => 'Basic'
        ],
        'countries'  => [
            'Japan', // these
            'Korea'  // two...
        ],
    ],
    [
        'product'   => [
            'value' => 'pro',
            'label' => 'Pro'
        ],
        'countries'  => [
            'Japan', // ...and these two
            'Korea'  // are identical...
        ],
    ],
    [
        'product'   => [
            'value' => 'expert',
            'label' => 'Expert'
        ],
        'countries'  => [
            'Japan',
            'France'
        ],
    ]

];
          
$result = [];
foreach ($array as $row) {
    sort($row['countries']);
    $compositeKey = implode('_', $row['countries']);
    if (!isset($result[$compositeKey])) {
        $result[$compositeKey] = $row;
    } elseif (isset($result[$compositeKey]['product']['value'])) {
        $result[$compositeKey]['product'] = [
            $result[$compositeKey]['product'],
            $row['product']
        ];
    } else {
        $result[$compositeKey]['product'][] = $row['product'];
    }
}
echo json_encode(array_values($result), JSON_PRETTY_PRINT);

Output for rfc.property-hooks, git.master, git.master_jit: [ { "product": [ { "value": "basic", "label": "Basic" }, { "value": "pro", "label": "Pro" } ], "countries": [ "Japan", "Korea" ] }, { "product": { "value": "expert", "label": "Expert" }, "countries": [ "France", "Japan" ] } ]

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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