警告：无法修改标头信息 - 标头刷新已经发送的标头，重定向[重复]

Question

Possible Duplicate:
Headers already sent by PHP

I am getting this error when I try to redirect after running a user login script.

It attempts to change the header data at this line:

header("Refresh: 2; url=index.php");

This is the full login.php script.

<?php 
session_start();
require_once('init.php');

$username = trim($_POST['username']);
// create a new object
$login = new Auth($_POST, $dbh);

    if($login->validateLogin()){

        $_SESSION['loggedin'] = true;
        $_SESSION['username'] = $username;
        $list = $login->getUserInfo();
        $_SESSION['id'] = $list['id'];
        $_SESSION['thumb'] = $list['img_thumb'];

        echo '<div class="content">';
        echo '<h1>Thank you for logging in '.$username.'. Redirecting...</h1>';
        echo '</div>';
        header("Refresh: 2; url=index.php");

    }else{

        echo '<div class="content">';
        echo '<h1>Sorry but we didn\'t recognise those login details, please try again.</h1>';
        echo '</div>';

    }



require_once('inc/footer.inc.php');
?>

The init.php file calls the header.php containing the html5 doctype, meta tags etc.

How can I redirect the user to the index page after logging them in and send the header information as usual?

Answer 1

From the PHP docs.

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.

If you want the page to redirect after a few seconds you will need to use Meta Refresh.

<meta http-equiv="refresh" content="5;URL='http://example.com/'">