使用PHP将WWW重定向到非WWW重定向 [英] WWW to non-WWW Redirect with PHP

问题描述

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

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中那样维护请求的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

应重定向到:

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

我不想依靠.htaccess解决方案，并且我不确定要使用哪种$_SERVER变量来实现这一目标.另外，保留HTTPS协议将是一个加分.

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.

我应该怎么做?

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);

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.

因此，要摆脱www. ，我们只需替换一行:

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;

那应该可行.

顺便说一句，这是Google推荐的方法，因为它保持了https://以及端口等(如果您确实使用过)的完整性.

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所指出的，他使用$_SERVER['HTTP_HOST']，因为它来自标头而不是服务器，因此$_SERVER['SERVER_*']不太可靠.您可以将某些$_SERVER['SERVER_NAME']替换为$_SERVER['HTTP_HOST']，它的工作方式应相同.

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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