php - MySqli 查询多维数组

Question

我正在尝试将结果从 MySQLi select 转换为多维数组，但没有得到想要的结果。这是从 SELECT 语句返回的数据:

+----+------------+
| id | value      |
+----+------------+
| 2  | Red        |
| 2  | Blue       |
| 1  | Green      |
| 1  | Yellow     |
| 1  | Orange     |
| 3  | Teal       |
+----+------------+

可以有多个具有相同 ID 的值。我的获取语句如下所示:

while ($stmt->fetch()) {
    $colors[] = array($value);
}

结果是这样的:

Array
(
    [0] => Array
    (
        [0] => Red
    )
    [1] => Array
    (
        [0] => Blue
    )
    [2] => Array
    (
        [0] => Green
    )
    [3] => Array
    (
        [0] => Yellow
    )
    [4] => Array
    (
        [0] => Orange
    )
    [5] => Array
    (
        [0] => Teal
    )
)

但是，我真正想要的是数组看起来像这样:

Array
(
    [0] => Array
    (
        [0] => Red
        [1] => Blue
    )
    [1] => Array
    (
        [0] => Green
        [1] => Yellow
        [2] => Orange
    )
    [2] => Array
    (
        [0] => Teal
    )
)

如有任何帮助，我们将不胜感激!

Answer 1

或者，您可以使用 id 在循环内对它们进行分组。示例:

$stmt->bind_result($id, $value);
while ($stmt->fetch()) {
    $colors[$id][] = $value;
}

// $colors = array_values($colors); // optional, if you want to reindex the keys