php教程|php手册
php,强制,转向,www域名
php教程-php手册
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这篇文章主要介绍了php强制用户转向www域名的方法,可实现模拟301重定向的功能,并且针对无法head重定向的情况输出链接,需要的朋友可以参考下
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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。
// 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 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
// 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 ????
