使用 PHP 将 WWW 重定向到非 WWW
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WWW to non-WWW Redirect with PHP
提问by Alix Axel
I want to redirect all www.domain.com requests to domain.com with PHP, basically:
我想用 PHP 将所有 www.domain.com 请求重定向到 domain.com，基本上：
if (substr($_SERVER['SERVER_NAME'], 0, 4) === 'www.')
{
header('Location: http://' . substr($_SERVER['SERVER_NAME'], 4)); exit();
}
However I do want to maintain the requested URL like in SO, for e.g.:
但是我确实想像 SO 一样维护请求的 URL，例如：
http://www.stackoverflow.com/questions/tagged/php?foo=bar
Should redirect to:
应该重定向到：
http://stackoverflow.com/questions/tagged/php?foo=bar
I don't want to rely on .htaccesssolutions, and I'm unsure which $_SERVERvars I'd have to use to make this happen. Also, preserving the HTTPS protocol would be a plus.
我不想依赖.htaccess解决方案，我不确定$_SERVER我必须使用哪些变量来实现这一点。此外，保留 HTTPS 协议将是一个加分项。
How should I do this?
我该怎么做？
采纳答案by Tyler Carter
$pageURL = (@$_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);
Would redirect the user to the exact same page, www. intact.
将用户重定向到完全相同的页面，www。完整。
So, to get rid of the www. , we just replace one line:
所以，摆脱www。，我们只替换一行：
$pageURL = (@$_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;
And that should work.
这应该有效。
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.
顺便说一句，这是谷歌推荐的方法，因为它保持https://完整，如果你确实使用了端口等。
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 $_SERVER['HTTP_HOST'], and it should work the same way.
正如 Gumbo 指出的那样，他使用的$_SERVER['HTTP_HOST']是来自标头而不是服务器的信息，因此$_SERVER['SERVER_*']不太可靠。您可以取代一些$_SERVER['SERVER_NAME']带$_SERVER['HTTP_HOST']，它应该工作方式相同。
回答by Gumbo
Try this:
尝试这个：
if (substr($_SERVER['HTTP_HOST'], 0, 4) === 'www.') {
header('Location: http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on' ? 's':'').'://' . substr($_SERVER['HTTP_HOST'], 4).$_SERVER['REQUEST_URI']);
exit;
}
回答by amar nath jena
if (isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) != 'off')) {
$https = 1;
} else {
$https = 0;
}
if (substr($_SERVER['HTTP_HOST'], 0, 4) !== 'www.') {
redirect(($https?'https://':'http://') .'www.' . $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
}
if (isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) != 'off')) {
$https = 1;
} else {
$https = 0;
}
if (substr($_SERVER['HTTP_HOST'], 0, 4) !== 'www.') {
redirect(($https?'https://':'http://') .'www. ' . $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
}
