PHP标头位置重定向不起作用 - 为什么？ [重复]

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这个问题在这里已有答案：

How to fix “Headers already sent” error in PHP 11 answers
如何修复PHP 11答案中的“Headers already sent”错误

Here's my file. I want to make it redirect, but nothing happens. To check out what is going on, I added an echo before the header part.

这是我的档案。我想让它重定向，但没有任何反应。为了查看发生了什么，我在标题部分之前添加了一个echo。

It neither throws an error or redirect to index.php. What is wrong? I have turned output buffering on/off, but nothing makes it redirect. What can I do?

它既不会抛出错误，也不会重定向到index.php。哪里不对？我打开/关闭输出缓冲，但没有任何东西使它重定向。我能做什么？

<?
error_reporting(E_ALL);
echo 'This is an error';

header("Location: login.php");
die();
?>

Thanks

谢谢

4 个解决方案

#1

From PHP documentation :

从PHP文档：

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

必须在通过普通HTML标记，文件中的空行或PHP发送任何实际输出之前调用header（）。

And in your case, you are using echo before header()

在你的情况下，你在header（）之前使用echo

#2

I reminded myself that I had xDebug installed on the actual test environment and after googling it, I found this site: http://bugs.xdebug.org/view.php?id=532

我提醒自己，我在实际的测试环境中安装了xDebug，在谷歌搜索后，我找到了这个网站：http：//bugs.xdebug.org/view.php？id = 532

So I'll downloaded the last version of xDebug and changed the php.ini accordingly for the new file and everything works out like a charm. Headers are being sent - the redirecetion is done and errors are displayed.

因此，我将下载最新版本的xDebug，并相应地更改了php.ini以获取新文件，所有内容都像魅力一样。正在发送标头 - 重定向已完成并显示错误。

Thanks everybody for your help!

谢谢大家的帮助！

#3

Do you have short tags enabled? try it with the long tag <?php:

你有短标签吗？尝试使用长标签<？php：

<?php
error_reporting(E_ALL);
header("Location: login.php");
die();
?>

#4

Is display_errors enabled?
@Gumbo - It sure is!

是否启用了display_errors？ @Gumbo - 肯定是！

well, it sure is not. because

好吧，肯定不是。因为

To check out what is going on, I added an echo before the header part.

为了查看发生了什么，我在标题部分之前添加了一个echo。

if you'd have display_errors enabled, it would display an error, at least when you turned output buffering on.

如果您启用了display_errors，它将显示错误，至少在您打开输出缓冲时。

So, first of all make sure you can see error messages.
just print out an undefined variable,

因此，首先要确保您可以看到错误消息。只打印出一个未定义的变量，

error_reporting(E_ALL);
echo $undef9306;

I am sure you won't see it. So, you have to turn displaying errors on

我相信你不会看到它。因此，您必须打开显示错误

Next, on the server side you can use headers_sent() function to see if headers were sent. On client side use HTTP sniffer to see if anything were sent

接下来，在服务器端，您可以使用headers_sent（）函数来查看是否已发送标头。在客户端使用HTTP嗅探器查看是否发送了任何内容

And check your file for the BOM.

并检查文件中的BOM。

#1