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@ 2022-08-18T10:11:55Z

<?php

$array = [
    ['color' => '#000000', 'size' => 'L', 'count' => 2],
    ['color' => '#000000', 'size' => 'XL', 'count' => 1],
    ['color' => '#ffffff', 'size' => 'L','count' => 2],
    ['color' => '#ffffff', 'size' => 'XL', 'count' => 1],
    ['color' => '#ff0000', 'size' => 'L', 'count' => 1]
];
          
$result = [];
foreach ($array as $row) {
    if (!isset($result[$row['color']])) {
        $result[$row['color']] = $row;
    } elseif (isset($result[$row['color']]['count'])) {
        $result[$row['color']]['size'] = [
            [
                'value' => $result[$row['color']]['size'],
                'count' => $result[$row['color']]['count']
            ],
            [
                'value' => $row['size'],
                'count' => $row['count']
            ]
        ];
        unset($result[$row['color']]['count']);
    } else {
        $result[$row['color']]['size'][] = [
            'value' => $row['size'],
            'count' => $row['count']
        ];
    }
}
echo json_encode(array_values($result), JSON_PRETTY_PRINT);

Output for git.master, git.master_jit, rfc.property-hooks: [ { "color": "#000000", "size": [ { "value": "L", "count": 2 }, { "value": "XL", "count": 1 } ] }, { "color": "#ffffff", "size": [ { "value": "L", "count": 2 }, { "value": "XL", "count": 1 } ] }, { "color": "#ff0000", "size": "L", "count": 1 } ]

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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