php强制用户转向www域名的方法

php  /  管理员 发布于 7年前   297

本文实例讲述了php强制用户转向www域名的方法。分享给大家供大家参考。具体分析如下：

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.net.cn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。

// Install info.:// Copy and paste these lines into your default index.php or// the file that get's 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 .net.cn trough your own domain :-D

希望本文所述对大家的php程序设计有所帮助。

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