Using PHP to resolve level two domain name redirection

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After registering the domain name, often need to implement different two level domain name to visit different nodes of the site

The General domain registrar provides a way to parse the CNAME, you can define the two-level domain name to different IP.

Like what

Www.abc.com pointing to the primary node 1.2.3.4

Bbs.abc.com point to 1.2.3.4/bbs or another IP

But if the site rented a hosting space, the problem of egg pain came.

The site has only one IP, and the site is a rented hosting space, not a managed host, not directly set up different access nodes, the managed space can only set a space provider to provide a portal URL

That is, the site has only one entry, two-level domain name can not be directly resolved to different sub-directories

Using PHP's code can solve this problem,

Ideas

1. Define different level two domain names and point to the same site portal

2. On the first page of the portal index.php, determine the domain name entered by the user and redirect to the site sub-contact

PHP global variable $_server[' http_host '], you can obtain the user's current access to the domain name string, in this case to query their own defined sub-domain strings, and then use the header function to redirect to different pages

The code is as follows

if (Strpos ($_server[' http_host '), "China")!== false)//Note Be sure to use!== cannot use! =, otherwise you cannot distinguish between false and 0
{//
Header (' location:/china/indexphp ');
}elseif (Strpos ($_server[' http_host '), "BBS")!== false)
{
Header (' location:/bbs/forum.php ');
}
Else
{//Show home page
Header (' location:/templets/default/index.htm ');
}

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