Question

我有以下代码段。当我检查结果数组有多少行时，它会打印出1。但是，当我尝试访问其中的数据（名字，姓氏，用户名等）时，它什么也不会打印。

$username = mysqli_real_escape_string($db, $_POST['username']);
$password = mysqli_real_escape_string($db, $_POST['password']);

$password = md5($password);
$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$results = mysqli_query($db, $query);

if (mysqli_num_rows($results) == 1) {
    $session_user = mysqli_fetch_assoc($result);

    $_SESSION['firstname'] = $session_user['firstname'];
    $_SESSION['lastname'] = $session_user['lastname'];
    echo $_SESSION['firstname']; // doesn't print anything

    $_SESSION['username'] = $username;
    $_SESSION['success'] = true;

    header('location: index.php');
}

然而，MYSQL数据库显示数据在那里，并且列名的确正确，顺序为：ID，用户名，名字，姓氏，电子邮件，密码。

我迷路了，我在这里做什么错了？

Answer 1

您在$result函数中调用了错误的变量$results而不是mysqli_fetch_assoc。

Answer 2

也许可以。

if (mysqli_num_rows($results) > 0) {
    $session_user = mysqli_fetch_assoc($result);

    $_SESSION['firstname'] = $session_user['firstname'];
    $_SESSION['lastname'] = $session_user['lastname'];
    echo $_SESSION['firstname']; // doesn't print anything

    $_SESSION['username'] = $username;
    $_SESSION['success'] = true;

    header('location: index.php');
}

mysqli_num_rows显示找到1行，但是mysqli_fetch_assoc在echo时返回空字段

2 个答案: