我想正确的消息显示时，用户点击电子邮件激活链接多次

Question

我正在为我的a-Level做一个编程课程，我被一个问题困住了。我希望你们中的一个能帮助我。

我正在建立一个会员系统，目前我正处于电子邮件激活阶段。通过使用连接数据库的php和mysqli编码，我已经能够将电子邮件激活链接设置为工作状态，以便当用户单击激活链接时，它通过将“活动”数据库字段从“0”设置为“1”来激活用户的帐户。

我唯一的问题是，如果用户在电子邮件中再次单击激活链接，因为用户已经处于活动状态，我希望它显示消息“此帐户已被激活”；。这是因为用户无法再次激活该帐户。

但我无法让它显示此消息。即使用户已经激活了帐户，它仍会显示消息“帐户已激活”。有人知道我做错了什么吗？

下面是我的代码：

<?php
$user_to_be_activated  =   $_GET['user'];
$code_to_be_matched   =   $_GET['code'];
$code_activated = 1;

// don't use $mysqli->prepare here
$query = "SELECT TeacherUsername, Active, Code FROM Teacher WHERE TeacherUsername = ? AND Code = ? ";
// prepare query
$stmt=$mysqli->prepare($query);
// You only need to call bind_param once
$stmt->bind_param("ss",$user_to_be_activated, $code_to_be_matched);
// execute query
$stmt->execute(); 
// get result and assign variables (prefix with db)
$stmt->bind_result($dbTeacherUsername, $dbActive, $dbCode);
//get number of rows
$stmt->store_result();
$counting = $stmt->num_rows();

if($counting == '1')
{

    if($dbActive == '1')
    {
        echo "This Account has already been Activated";
    }
    else{

    $updatesql = "UPDATE Teacher SET Active = ? WHERE TeacherUsername = ? AND Code = ?";                                            
    $update = $mysqli->prepare($updatesql);
    $update->bind_param("sss", $code_activated, $user_to_be_activated, $code_to_be_matched);
    $update->execute();
    $update->close();

    echo "Account is Activated";
}
}
else
{
    echo "The Code and Username doesn't match! Account is not Activated.";
}
?>

Answer 1

<?
$stmt->store_result();
$counting = $stmt->num_rows();

if($counting == '1')
{
    $stmt->fetch(); //added fetch here
    if($dbActive == '1')
    {
        echo "This Account has already been Activated";
    }
    else{

    $updatesql = "UPDATE Teacher SET Active = ? WHERE TeacherUsername = ? AND Code = ?";                                            
    $update = $mysqli->prepare($updatesql);
    $update->bind_param("sss", $code_activated, $user_to_be_activated, $code_to_be_matched);
    $update->execute();
    $update->close();

    echo "Account is Activated";
}
}
else
{
    echo "The Code and Username doesn't match! Account is not Activated.";
}
?>