从mysqli_query和PHP创建一个简单的数组

Question

如何获得此结果：

{"lines":[{"sucursal":"aguascalientes","value":"aguascalientes","value_front":"ih Aguascalientes"},{"sucursal":"puebla","value":"puebla","value_front":"ih Puebla"},{"sucursal":"monterrey","value":"monterrey","value_front":"ih Monterrey"},{"sucursal":"riviera_maya","value":"riviera_maya","value_front":"ih Riviera Maya"},{"sucursal":"chihuahua","value":"chihuahua","value_front":"Chihuahua"}]}

我正在尝试使用以下代码：

$conn = mysqli_connect("localhost",$a,$p,$db);
    $result = mysqli_query($conn, $query);
    $rows = [];
    while($row = mysqli_fetch_array($result))
    {   

        $rows[] = $row;
    }
    return $rows;

希望您能帮上忙。

谢谢