function get_following($user_id) {
 global $conn;
 $stmt = $conn->prepare("SELECT * FROM following WHERE `follower_id`=:user");
 $stmt->bindParam(':user',$user_id,PDO::PARAM_INT);
 $stmt->execute();
 $following =$stmt->fetch(PDO::FETCH_ASSOC);
 return $following;
}

下表如下所示：

|user_id|follower_id|
|   2   |     5     |
|   3   |     5     |
|   4   |     5     |

现在的问题是,当我实际调用该函数时,它只选择表中的一行,其中我的follower_id = 5.