从特定页面重定向后更改文本...？

Question

正如标题所示，我正在尝试使用相同的 .php 页面，并让它在从特定位置重定向时显示新的内容。在上下文中...我有一个登录，成功登录后重定向到主页，但如果不成功，则重定向到索引。有没有办法让我的索引页面在从登录页面重定向时显示“登录错误”消息？这是我的登录代码...<?phpsession_start();include('conn.php');$query = "SELECT * FROM User";$result = mysqli_query($conn, $query) or die(mysqli_error($conn));if (isset($_POST["submit"])) {    $logEmail = $conn->real_escape_string($_POST['logEmail']);    $logPass = $conn->real_escape_string($_POST['logPass']);    $checkuser = "SELECT * FROM User WHERE Email='$logEmail' AND UserPassword=AES_ENCRYPT('$logPass', 'MyKey')";    $userresult = mysqli_query($conn, $checkuser) or die(mysqli_error($conn));    $loginsucc = (mysqli_num_rows($userresult) > 0);    if (mysqli_num_rows($userresult) > 0) {        while ($row = mysqli_fetch_assoc($userresult)) {            $userPriKey = $row['UserID'];            $userid = $row['Email'];            $accounttype = $row['IsAdmin'];            $firstname = $row['FirstName'];            $surname = $row['LastName'];            $_SESSION['userPriKey'] = $userPriKey;            $_SESSION['name'] = $firstname;            $_SESSION['surname'] = $surname;            $_SESSION['Email'] = $userid;            $_SESSION['IsAdmin'] = $accounttype;            if($accounttype == '1'){                header("Location: home.php");            }else if ($accounttype == '0'||$accounttype == NULL ) {                header("Location: userhome.php");            }        }    } else {        header("Location: index.php");    }}?>

Answer 1

在调用之前header()设置一个会话变量，如下所示

$_SESSION['msg'] = 'success you are logged in';

header('Location: page.php');

exit; 

然后在page.php中，

session_start();

if (isset($_SESSION['msg'])) {

    echo $_SESSION['msg'];

    unset($_SESSION['msg']);

}

另外仅供参考，您应该使用准备好的语句。您的代码并不完全安全