php - MYSQLI 查询得到一个单一的结果

Question

我只需要从 mysql 数据库中获取用户名为 X 的成员的 ID。这只能通过while循环来完成，还是有其他方法可以解决这个问题？

我在想的是这样的：

$id = mysqli_query($con,'SELECT id FROM membrs WHERE username = '$username' LIMIT 1)

谢谢，

Answer 1

您可以使用：

mysqli_fetch_array();

// For Instance

$id_get = mysqli_query($con, "SELECT id FROM membrs WHERE username='$username' LIMIT 1");

$id = mysqli_fetch_array($id_get);

echo $id['id']; // This will echo the ID of that user

// What I use is the following for my site:

$user_get = mysqli_query($con, "SELECT * FROM members WHERE username='$username'");

$user = mysqli_fetch_array($user);

echo $user['username']; // This will echo the Username

echo $user['fname']; // This will echo their first name (I used this for a dashboard)

Answer 2

如果没有 while 循环，我们可以通过以下代码来完成，如果您选择超过 1 条记录，则需要循环它

$row = mysqli_fetch_array($id);
echo $row['id'];