Question

我正在制作一个简单的注册和登录页面，登录后您将在其中重定向到index.php。注册工作正常，但登录后出现此错误。 “警告：无法修改标头信息-标头已由第27行的/login.php中的（发送自/login.php:9的输出发送）”

当我在xampp服务器上创建此网站时，它运行良好，但是当我将其联机时，会出现此错误：（

我已经在Google查了几个小时，而我遇到的每个解决方案都没有用。我知道有很多关于此错误的问题，但我花了一整天的时间来解决这个问题，但我现在想放弃了。请帮助我

            <!DOCTYPE html>
            <html>
            <head>
            <meta charset="utf-8">
            <title>Login</title>
            <link rel="stylesheet" href="css/style.css" />
            </head>
            <body>
            <?php
            require('db.php');
            // If form submitted, insert values into the database.
            if (isset($_POST['username'])){
                    // removes backslashes
                $username = stripslashes($_REQUEST['username']);
                    //escapes special characters in a string
                $username = mysqli_real_escape_string($con,$username);
                $password = stripslashes($_REQUEST['password']);
                $password = mysqli_real_escape_string($con,$password);
                //Checking is user existing in the database or not
                    $query = "SELECT * FROM `users` WHERE username='$username'
            and password='".md5($password)."'";
                $result = mysqli_query($con,$query) or die(mysql_error());
                $rows = mysqli_num_rows($result);
                    if($rows==1){
                    $_SESSION['username'] = $username;
                    // redirect
            header("Location: index.php"); // this is line 27
                     }else{
                echo "<div class='form'>
            <h3>Username/password is incorrect.</h3>
            <br/>Click here to <a href='login.php'>Login</a></div>";
                }
                }else{

            ?>
            <div class="form">
            <h1>Log In</h1>
            <form action="" method="post" name="login">
            <input type="text" name="username" placeholder="Username" required />
            <input type="password" name="password" placeholder="Password" required />
            <input name="submit" type="submit" value="Login" />
            </form>
            <p>Not registered yet? <a href='registration.php'>Register Here</a></p>
            </div>
            <?php } ?>
            </body>
            </html>

无法修改标题信息，没有任何效果

0 个答案: