为了理解PHP的header（）

问题描述

在handlers / handle_login.php中有以下代码：

用户已经从 index.php 这个出发地去了网站。

  if（！$ logged_in）{
 header（Location：index.php）; 
 die（You are not logged_in）; 
 
 
 
 
 
 $ b如果if-clause为真，我会得到一个404错误，让我去 handlers / index.php ，而不是 index.php 。
 
虽然我同意nilamo和伯爵，但我希望能给出一个更大的图片： 
 
 
使用
解决方案
相对路径可能会产生非常奇怪的效果，具体取决于浏览器
'认为'它在您的网站层次结构中的位置。例如，假设该站点有一个索引文件'/index.php'，但被配置为接受URI路径中的模块和动作。您可能会看到如下所示的网址：
  http://www.yoursite.com/forms/contact/ 
  
在这种情况下，返回一个标头，如： 
 
 
  header（Location：index.php）; 
  
可能会导致浏览器尝试请求
  http://www.yoursite.com/forms/contact/index.php 
  
这显然不是你想要的。出于这个原因，通常最好使用上面推荐的'/index.php'，或者更好地使用完全限定的URL。
 / p> 
Where do you use the command header()?
I have the following code at handlers/handle_login.php. The user has gone to the site from index.php which is the starting place.
 if(!$logged_in){
     header("Location: index.php");
     die("You are not logged_in");
 }
If if-clause is true, I get a 404 error, since the header puts me to to handlers/index.php, instead of index.php.
 解决方案 
While I agree with nilamo and earl, I hope I can give a bigger picture:
Using relative paths can have very strange effects depending on where the browser'thinks' it is in your site hierarchy.  For example, assume the site has an index file '/index.php' but is configured to accept module and action in the URI path.  You may very well have a url that looks like:
http://www.yoursite.com/forms/contact/
From this situation, returning a header like:
header("Location: index.php");
may very well cause the browser to try to request
http://www.yoursite.com/forms/contact/index.php
which is obviously not what you want.  For this reason, it's generally better to use '/index.php' as recommended above, or even better use the fully qualified URL when possible.
Hope this helps.
                        
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