问题描述

我想用 PHP 将所有 www.domain.com 请求重定向到 domain.com，基本上:

I want to redirect all www.domain.com requests to domain.com with PHP, basically:

if (substr($_SERVER['SERVER_NAME'], 0, 4) === 'www.')
{
    header('Location: http://' . substr($_SERVER['SERVER_NAME'], 4)); exit();
}

但是我确实想像 SO 一样维护请求的 URL，例如:

However I do want to maintain the requested URL like in SO, for e.g.:

http://www.stackoverflow.com/questions/tagged/php?foo=bar

应该重定向到:

http://stackoverflow.com/questions/tagged/php?foo=bar

我不想依赖 .htaccess 解决方案，而且我不确定我必须使用哪些 $_SERVER 变量来实现这一点.此外，保留 HTTPS 协议将是一个加分项.

I don't want to rely on .htaccess solutions, and I'm unsure which $_SERVER vars I'd have to use to make this happen. Also, preserving the HTTPS protocol would be a plus.

我该怎么做?

推荐答案

$pageURL = (@$_SERVER["HTTPS"] == "on") ? "https://" : "http://";
if ($_SERVER["SERVER_PORT"] != "80")
{
    $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} 
else 
{
    $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
}
header('Location: '. $pageURL);

会将用户重定向到完全相同的页面 www.完好无损的.

Would redirect the user to the exact same page, www. intact.

所以，去掉www.，我们只替换一行:

So, to get rid of the www. , we just replace one line:

$pageURL = (@$_SERVER["HTTPS"] == "on") ? "https://" : "http://";
if ($_SERVER["SERVER_PORT"] != "80")
{
    $pageURL .= substr($_SERVER['SERVER_NAME'], 4).":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
} 
else 
{
    $pageURL .= substr($_SERVER['SERVER_NAME'], 4).$_SERVER["REQUEST_URI"];
}
return $pageURL;

这应该可行.

顺便说一句，这是 Google 推荐的方法，因为它保持 https:// 完整，以及端口等，如果您确实使用它们.

By the way, this is the method that is recommended by Google, as it keeps https:// intact, along with ports and such if you do use them.

正如 Gumbo 指出的，他使用 $_SERVER['HTTP_HOST'] 因为它来自标头而不是服务器，因此 $_SERVER['SERVER_*'] 不那么可靠.你可以用 $_SERVER['HTTP_HOST'] 替换 some$_SERVER['SERVER_NAME']，它应该以同样的方式工作.

As Gumbo pointed out, he uses $_SERVER['HTTP_HOST'] as it comes from the headers instead of the server, thus $_SERVER['SERVER_*'] is not as reliable. You could replace some$_SERVER['SERVER_NAME'] with $_SERVER['HTTP_HOST'], and it should work the same way.

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