Question

例如我有桌子：

ID   |   Nickname   |      IP     |
----------------------------------|
1.   |  CustomNick  |  127.0.0.1  |
2.   |  NickCustom  |  127.0.0.1  |

现在我通过这段代码传递信息：

$stmt = $this->db->prepare("SELECT * FROM players WHERE Nickname = ?");
$stmt->execute(array($_SESSION['player_session']));

$playerInfo = $stmt->fetch(PDO::FETCH_ASSOC);
if($stmt->rowCount() > 0) :
    return $playerInfo;
endif;

我使用此$info['columnName']打印价值。我的问题是，如何通过记录的玩家ID进行检查，他是否拥有此IP地址的更多帐户？如果是，请打印这些帐户昵称

例如，如果我登录customNick，则输出：CustomNick还有一个具有此IP的帐户（NickCustom）。对不起，我的英语不好，并提前致谢

Answer 1

这是你的解决方案..

方法1：子查询

$stmt = $this->db->prepare("SELECT * FROM players WHERE IP = (SELECT IP FROM players WHERE Nickname = ?)");
$stmt->execute(array($_SESSION['player_session']));

方法2：加入

$stmt = $this->db->prepare("SELECT * FROM players p1 INNER JOIN players p2 ON p1.IP = p2.IP WHERE p1.Nickname = ?");
$stmt->execute(array($_SESSION['player_session']));

PHP MySQL返回具有相同值的列

1 个答案: