警告:无法修改标头信息

问题描述

可能的重复:
PHP 已经发送的标头

当我成功登录一个页面时，我收到有关标题已发送"的错误消息.

I'm getting errors about "headers already sent" when I successfully log into a page.

这是我处理登录的代码:

Here's my code that deals with the login:

<?php
include("config.php");
$eUsername = $_POST['username'];
$ePassword = $_POST['password'];

$con = mysql_connect("localhost","MY_USERNAME","MY_PASSWORD");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("forum", $con);
$result = mysql_query("SELECT * FROM members WHERE username = '$eUsername'");

while($row = mysql_fetch_array($result))
  {
    if ($ePassword==$row['password']) {
      echo "Correct";
       setcookie("loggedIn", "true", time()+1000000000);
       setcookie("logUsername", "$eUsername", time()+100000000);
       setcookie("logPassword", "$ePassword", time()+100000000);
    }
    else {
      echo "Incorrect username/password.  Please try again.";
    }
  }
mysql_close($con);
if ($_COOKIE['loggedIn']=="true") {
$curURL=basename($_SERVER['SCRIPT_NAME']);
echo "You are already logged in.  <a href='$curURL?lo=true'>Log out?</a>";
}
echo "<br /><br />";
print_r($_COOKIE);
?>

所以基本上它的作用是如果您使用正确的信息登录，它会设置三个 cookie，您的用户名、密码和一个来检查其他两个.

So basically what this does is if you log in with the correct information, it will set three cookies, your username, password and one to check for the other two.

但是当我成功登录时，出现以下错误:

But when I do log in successfully, I get these errors:

警告:无法修改标题信息 - 标题已由(输出开始于/home/scott/web/forum/index.php:18)在/home/scott/web/forum/index.php 中第 19 行发送

Warning: Cannot modify header information - headers already sent by (output started at /home/scott/web/forum/index.php:18) in /home/scott/web/forum/index.php on line 19

警告:无法修改标题信息 - 标题已由(输出开始于/home/scott/web/forum/index.php:18)在/home/scott/web/forum/index.php 第 20 行

Warning: Cannot modify header information - headers already sent by (output started at /home/scott/web/forum/index.php:18) in /home/scott/web/forum/index.php on line 20

警告:无法修改标题信息 - 标题已由(输出开始于/home/scott/web/forum/index.php:18)在第 21 行的/home/scott/web/forum/index.php 中发送

Warning: Cannot modify header information - headers already sent by (output started at /home/scott/web/forum/index.php:18) in /home/scott/web/forum/index.php on line 21

我做错了什么?

问题描述

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