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php强制用户转向www域名 php强制用户转向www域名的方法

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想了解php强制用户转向www域名的方法的相关内容吗,不吃皮蛋在本文为您仔细讲解php强制用户转向www域名的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:php,强制,转向,www域名,下面大家一起来学习吧。

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jb51.net会直接转向www.qb5200.com,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 "www.qb5200.com" but some other 
// applications send host names like "www.qb5200.com: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 != 'www.qb5200.com'){
  // 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: //www.qb5200.com' . $url);
  // Convert "special" chars -- cause we never now... ;-)
  $url = htmlspecialchars($url);
  // "fallback" link, if the browser is not supporting header redirects
  print '<a href="//www.qb5200.com' . $url.'">Please click here</a>';
  // stop the script execution here
  exit;
}
// If the domain is www.qb5200.com then go on with your PHP code 
// of with your website...
// BTW: You need to replace jb51.net 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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