Question

大家好日子，我是PHP新手。我查了w3c并得到了一些很好的建议。但是我的登录代码遇到了一个小小的挑战。它显示了PHP警告：无法修改标头信息 - 第8行/home/perspect/public_html/jst/index.php中已经发送的标头（在/home/perspect/public_html/jst/dbcon.php:2处开始输出）下面是我的索引页面;

<?php
session_start();
include_once 'includes/dbcon.php';

if(isset($_SESSION['user'])!="")
{
    header("Location: candidate_list.php");
}

if(isset($_POST['btn-login']))
{

    $username = mysqli_real_escape_string($con, $_POST['username']);
    $password = mysqli_real_escape_string($con, $_POST['password']);
    $stat = 'notvoted';

    $res=mysqli_query($con,"SELECT * FROM students WHERE username='$username' AND status='$stat'");
    $row=mysqli_fetch_array($res);

    if($row['password']==md5($password))
    {
        $_SESSION['user'] = $row['user_id'];
        header("Location: candidate_list.php");
    } 
    else
    {
        ?>
        <script>alert('wrong details');</script>
        <?php
    } 

}
?>
<!-- Login Box -->
                            <div class="col-md-6 col-md-offset-3 col-sm-offset-3">
                                <form class="login-page" action="" method="post">
                                    <div class="login-header margin-bottom-30">
                                        <h2>Login</h2>
                                    </div>
                                    <div class="input-group margin-bottom-20">
                                        <span class="input-group-addon">
                                            <i class="fa fa-user"></i>
                                        </span>
                                        <input placeholder="VIN" name="username" class="form-control" type="text">
                                    </div>
                                    <div class="input-group margin-bottom-20">
                                        <span class="input-group-addon">
                                            <i class="fa fa-lock"></i>
                                        </span>
                                        <input placeholder="Password" name="password" class="form-control" type="password">
                                    </div>
                                    <div class="row">

                                        <div class="col-md-6">
                                            <button class="btn btn-primary pull-right" type="submit" name="btn-login">Login</button>
                                        </div>
                                    </div>
                                    <p> 
                                </form>
                            </div>
                            <!-- End Login Box -->

我的candidate_list.php代码是;

<?php
session_start();
include_once 'includes/dbcon.php';

if(!isset($_SESSION['user']))
{
    header("Location: index.php");
}
$res=mysqli_query($con, "SELECT * FROM students WHERE user_id=".$_SESSION['user']);
$userRow=mysqli_fetch_array($res);
?>

我的dbcon是

  <?php

$con=mysqli_connect("xxx","xxx","xxxx","xxx");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

?>

感谢您的帮助。

Answer 1

一旦你在标题重定向之前回显一些东西，就会出现这种类型的php警告。

如果您仍想重定向，可以使用ob_start，也可以使用javascript

window.location.href =路径

php登录工作离线但不在线

1 个答案: