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@ 2022-09-22T10:21:22Z

<?php
$arr = [
    [
        'id' => 1,
        'user_id' => 9788,
        'contact_id' => 10083,
        'product_id' => 1,
        'category_id' => 23,
        'grade' => 'A',
        'point' => 89,
    ],
    [
        'id' => 1,
        'user_id' => 9788,
        'contact_id' => 10083,
        'product_id' => 2,
        'category_id' => 27,
        'grade' => 'A',
        'point' => 89,
    ]
];
$groupedArr = array_reduce($arr, function ($a, $c) {
    $a[$c['user_id']] = [
        'user_id' => $c['user_id'],
        'contact_id' => $c['contact_id'],
        'attributes' => array_merge([[
            'product_id' => $c['product_id'],
            'category_id' => $c['category_id']
        ]], $a[$c['user_id']]['attributes'] ?? []),
        'grade' => $c['grade'],
        'point' => $c['point']
    ];
    return $a;
}, []);
echo json_encode(array_values($groupedArr), JSON_PRETTY_PRINT);

Output for git.master, git.master_jit, rfc.property-hooks: [ { "user_id": 9788, "contact_id": 10083, "attributes": [ { "product_id": 2, "category_id": 27 }, { "product_id": 1, "category_id": 23 } ], "grade": "A", "point": 89 } ]

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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