php教程|php手册
php,强制,转向,
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php强制用户转向www域名的方法，php强制转向域名
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有时候网站的www域名和非www域名都能访问网站，但是这样不利于搜索引擎的收录，会分散网页的权重，所以希望用户访问非www的域名时通过301永久重定向到www域名，例如用户访问会直接转向，本php代码考虑了无法通过head重定向的情况，会在页面上输出链接，让用户点击。
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// Install info.:// Copy and paste these lines into your default index.php or// the file that gets called if a visitor comes on your // website...// read the host from the server environment$host = $_SERVER["HTTP_HOST"];// fix host name - we never now... ;-)$host = strtolower($host);$host = trim($host);// This is important: // Webbrowsers like Firefox are doing their request without// the port number like "" but some other // applications send host names like ":80" $host = str_replace(:80, \, $host);$host = trim($host);// if the host is not starting with www. redirect the // user to the same URL but with www :-)if ($host != \){ // You an also change the "!=" to "==", if you want to force // the user to use the domain name without the www. // send status header, so that search engines or other services // detect that this is a permanent redirect and not a temporary header(HTTP/1.1 301 Moved Permanently); // read the URL the user requested: $url = isset($_SERVER["REQUEST_URI"]) ? $_SERVER["REQUEST_URI"] : \; // redirect the user to the new destination: header(Location: . $url); // Convert "special" chars -- cause we never now... ;-) $url = htmlspecialchars($url); // "fallback" link, if the browser is not supporting header redirects print Please click here; // stop the script execution here exit;}// If the domain is then go on with your PHP code // of with your website...// BTW: You need to replace trough your own domain :-D
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