Question

我有这个代码，允许用户只删除自己的主题。它正在工作，但如果用户不是发布主题的人，他仍然收到消息：主题已被删除，而他应该得到：你没有做这个主题。 else语句没有运行。

if(isset($_SESSION['username']))
{
    $uid = $_SESSION['uid']; 
    $id=$_GET['id'];

    $check = mysql_query("SELECT * FROM topics WHERE id = '$id' AND topicCreator = '$uid'");
    if($check){
        $query1=mysql_query("delete FROM topics WHERE id='$id' AND topicCreator='$uid'");
        echo "<p>Topic has been successfully deleted. <a href='index.php'>Click here to return to home page.</a>";
    }
    else{
        echo "<p><b>ERROR: You didnt make this topic.";
    }
}

我不知道为什么else语句不会运行。

$ check是查看登录的用户是否是创建该主题的用户。

（PS：一旦有效，我会切换到mysqli。）

Answer 1

正如评论所示，您无法检查资源本身。尝试：

if(isset($_SESSION['username'])) {
    $uid = $_SESSION['uid']; 
    $id=$_GET['id'];
    $check = mysql_query("SELECT * FROM topics WHERE id = '$id' AND topicCreator = '$uid'");
    $count = mysql_num_rows($check);
    if($count) {
        // $count is greater than 1 hence TRUE
        $query1=mysql_query("delete FROM topics WHERE id='$id' AND topicCreator='$uid'");
        echo "<p>Topic has been successfully deleted. <a href='index.php'>Click here to return to home page.</a>";
    } else{
        // $count is 0 or FALSE - no rows returned
        echo "<p><b>ERROR: You didnt make this topic.";
    }
}

从数据库中删除主题

1 个答案: