在PHP中递归地对多个键上的数组进行分组

function groupArrayByKeys($array, $keys) {
    if (empty($array)) {
        return [];
    }
    
    $currentKey = array_shift($keys);
    $groups = [];
    
    foreach ($array as $item) {
        $key = $item[$currentKey];
        
        if (!isset($groups[$key])) {
            $groups[$key] = [];
        }
        
        $groups[$key][] = $item;
    }
    
    if (!empty($keys)) {
        foreach ($groups as $key => $group) {
            $groups[$key] = groupArrayByKeys($group, $keys);
        }
    }
    
    return $groups;
}

// 示例用法
$data = [
    ['id' => 1, 'category' => 'fruit', 'name' => 'apple'],
    ['id' => 2, 'category' => 'fruit', 'name' => 'orange'],
    ['id' => 3, 'category' => 'vegetable', 'name' => 'carrot'],
    ['id' => 4, 'category' => 'vegetable', 'name' => 'cabbage'],
    ['id' => 5, 'category' => 'fruit', 'name' => 'banana'],
    ['id' => 6, 'category' => 'vegetable', 'name' => 'tomato'],
];

$keys = ['category', 'name'];
$result = groupArrayByKeys($data, $keys);

print_r($result);

Array
(
    [fruit] => Array
        (
            [apple] => Array
                (
                    [0] => Array
                        (
                            [id] => 1
                            [category] => fruit
                            [name] => apple
                        )

                )

            [orange] => Array
                (
                    [0] => Array
                        (
                            [id] => 2
                            [category] => fruit
                            [name] => orange
                        )

                )

            [banana] => Array
                (
                    [0] => Array
                        (
                            [id] => 5
                            [category] => fruit
                            [name] => banana
                        )

                )

        )

    [vegetable] => Array
        (
            [carrot] => Array
                (
                    [0] => Array
                        (
                            [id] => 3
                            [category] => vegetable
                            [name] => carrot
                        )

                )

            [cabbage] => Array
                (
                    [0] => Array
                        (
                            [id] => 4
                            [category] => vegetable
                            [name] => cabbage
                        )

                )

            [tomato] => Array
                (
                    [0] => Array
                        (
                            [id] => 6
                            [category] => vegetable
                            [name] => tomato
                        )

                )

        )

)