PHP会话标头已发送错误 [英] Php Session header already send error

问题描述

可能重复:
php标头已发送错误

Possible Duplicate:
php headers already sent error

我附上了我的代码，该代码用于在php中进行非常基本的登录.它给出了错误

I have attached my code which am using for a very basic login in php. It giving an error

无法发送会话cookie-标头 已发送者(输出始于 C:\ xampp \ htdocs \ netsentries \ f \ includes \ functions.php:1)

Cannot send session cookie - headers already sent by (output started at C:\xampp\htdocs\netsentries\f\includes\functions.php:1)

   <?php 
    if (!isset($_POST['username'])) {
    ?>
    <h3>Login</h3>
    <form action="" method="post">
    Username<br/>
    <input name="username" type="text" /><br/>
    Password<br/>
    <input name="password" type="password" /><br/>
    <input name="" type="submit" /><br/>
    </form>
    <?php
    }
     else 
    { 
    include('includes/config.php');

    $data['username']= $_POST['username'];
    $data['password']= md5($_POST['password']);

    connect($db_name,$db_user,$db_pass,$db_host);

    $query= "select * from user where username='" . $data['username'] . "' AND password='" . $data['password'] . "'";

        $result=mysql_query($query);
        //check that at least one row was returned
        $rowCheck = mysql_num_rows($result);
        if($rowCheck > 0)
        {
        while($row = mysql_fetch_array($result))
            {
            session_start();
            session_register($data['username']);
            //successful login code will go here...
            //echo 'Logged in!'; 
            }
        }
        else
        {
        echo "Failed!";
        }



    }
    ?>

我无法找出问题所在

推荐答案

在完全输出任何HTML之后，您就不能session_start.将session_start调用上移至顶部，并保留一个变量以备后用. <?php ?>中不包括在内的任何内容，甚至包括您的包含文件.

You can't session_start after you've outputted any HTML at all. Move the session_start call up to the top, and keep a variable for what to echo later. Anything not in <?php ?> counts, even your include file.

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