Question

会话问题变得非常烦人。每次我尝试在特定页面上启动会话时，都会出现以下错误：

警告：session_start（）：无法发送会话缓存限制器 - 已在/ home / uplbcdcn / public_html / CDC / admin_uplbcdc中发送的标头（在/home/uplbcdcn/public_html/CDC/admin_uplbcdc/header.php:57中开始输出）第33行/index.php

警告：无法修改标头信息 - 已经发送的标头（/home/uplbcdcn/public_html/CDC/admin_uplbcdc/header.php:57中的输出）/home/uplbcdcn/public_html/CDC/admin_uplbcdc/index.php第42行

这是代码：header.php

<!DOCTYPE html>
<html>
<head>
        <title>UPLB Credit and Development Cooperative</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Bootstrap -->
            <link href="../css/bootstrap.css" rel="stylesheet" media="screen">
            <link href="../css/bootstrap-responsive.css" rel="stylesheet" media="screen">
            <link href="../css/docs.css" rel="stylesheet" media="screen">
            <link href="../css/diapo.css" rel="stylesheet" media="screen">
            <link href="../css/font-awesome.css" rel="stylesheet" media="screen">
            <link rel="stylesheet" type="text/css" href="../css/style.css" />
            <link rel="stylesheet" type="text/css" href="../css/DT_bootstrap.css" />
            <link rel="stylesheet" type="text/css" media="print" href="../css/print.css" />

    <!-- js -->         
    <script src="../js/jquery-1.7.2.min.js"></script>
    <script src="../js/bootstrap.js"></script>
     <script src="../js/jquery.hoverdir.js"></script>

<script>
jQuery(document).ready(function() {
$(function(){
    $('.pix_diapo').diapo();
});
});
</script>   
    <noscript>
            <style>
                .da-thumbs li a div {
                    top: 0px;
                    left: -100%;
                    -webkit-transition: all 0.3s ease;
                    -moz-transition: all 0.3s ease-in-out;
                    -o-transition: all 0.3s ease-in-out;
                    -ms-transition: all 0.3s ease-in-out;
                    transition: all 0.3s ease-in-out;
                }
                .da-thumbs li a:hover div{
                    left: 0px;
                }
            </style>
        </noscript>     

     <script type="text/javascript" charset="utf-8" language="javascript" src="../js/jquery.dataTables.js"></script>
    <script type="text/javascript" charset="utf-8" language="javascript" src="../js/DT_bootstrap.js"></script>
    <script type='text/javascript' src='../scripts/jquery.easing.1.3.js'></script> 
<script type='text/javascript' src='../scripts/jquery.hoverIntent.minified.js'></script> 
<script type='text/javascript' src='../scripts/diapo.js'></script> 


<!--sa calendar-->  
        <script type="text/javascript" src="../js/datepicker.js"></script>
        <link href="../css/datepicker.css" rel="stylesheet" type="text/css" />

</head>
<?php include('dbcon.php'); ?>
<body>


index.php

<?php include('header.php'); ?>
<?php include('navbar.php'); ?>
    <div class="container">
        <div class="margin-top">
            <div class="row">   
            <div class="span12">

                <div class="login">
                <div class="log_txt">
                <p><strong>Please Enter the Details Below..</strong></p>
                </div>
                        <form class="form-horizontal" method="POST">
                                <div class="control-group">
                                    <label class="control-label" for="inputEmail">Username</label>
                                    <div class="controls">
                                    <input type="text" name="username" id="username" placeholder="Username" required>
                                    </div>
                                </div>
                                <div class="control-group">
                                    <label class="control-label" for="inputPassword">Password</label>
                                    <div class="controls">
                                    <input type="password" name="password" id="password" placeholder="Password" required>
                                </div>
                                </div>
                                <div class="control-group">
                                    <div class="controls">
                                    <button id="login" name="submit" type="submit" class="btn"><i class="icon-signin icon-large"></i>&nbsp;Submit</button>
                                </div>
                                </div>

                                <?php
                                if (isset($_POST['submit'])){
                                session_start();
                                $username = $_POST['username'];
                                $password = $_POST['password'];
                                mysqli_select_db($dbcon,$database_dbcon);
                                $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
                                $result = mysqli_query($dbcon,$query)or die(mysqli_error());
                                $num_row = mysqli_num_rows($result);
                                    $row=mysqli_fetch_array($result);
                                    if( $num_row > 0 ) {
                                        header('location:dashboard.php');
                                $_SESSION['id']=$row['user_id'];
                                    }
                                    else{ ?>
                                <div class="alert alert-danger">Access Denied</div>     
                                <?php
                                }}
                                ?>
                        </form>

                </div>
            </div>      
            </div>
        </div>
    </div>
<?php include('footer.php') ?>

Answer 1

你可以尝试两件事

1）在最顶层写下session_start（）。

2）使用标题时使用exit 出口（报头（ '位置：dashboard.php'））;

消息：session_start（）：无法发送会话缓存限制器 - 已发送的标头

1 个答案: