Create subdomains on the fly with .htaccess (PHP)

Question

I am looking to create a system which on signup will create a subdomain on my website for the users account area.

e.g. johndoe.website.com

I think it would

Answer 1

Wildcard subdomain creation methods

FIrst you have to create the DNS settings using your server DNS editor.

1. Create A record in DNS settings with host * wild card in server ip address.

   * 1400 IN A ip_address

2. Create once again a A record in DNS settings with host @ or domain_name.tld in server ip address. tld means top level domains or the extension of the domains such as .com, .org, etc....

   @ 1400 IN A ip_address or domain_name.tld 1400 IN A ip_address

3. Create CNAME record like:

   www 1400 IN A domainname.tld

4. Create the subdomain with * wildcard like *.domain.tld

5. Create htaccess in your subdomain directory of *.domain.tld and put this code :

   Options +FollowSymLinks 
   RewriteEngine On 
   RewriteBase /
   RewriteRule ^([aA-zZ0-9]+)$ index.php?data=$1
   RewriteCond %{HTTP_HOST} ^([aA-zZ0-9]+)\.([aA-zZ0-9-]+)\.([aA-zZ]+)
   RewriteRule ([aA-zZ0-9]+) index.php?data=%1
   

   Test your first wildcard subdomain like example.domainname.tld

If you are not interest to pass the data as parameter using the htaccess, you can also get the data by using the following coding:

define("SUBDOMAIN_PARENT","domainname.tld");   
class getData
    {
         function __construct()
        {
            $this->data="";
            $http_host=$_SERVER['HTTP_HOST'];
         $subdom_data= str_replace(SUBDOMAIN_PARENT,"",$http_host);
         $expl_subdom_data=explode(".",$subdom_data);
      $expl_subdom_data=array_filter($expl_subdom_data);

            if($expl_subdom_data!=NULL)
            {
           $this->data=end($expl_subdom_data);
            }
       }
    }
$GLOBALS['get_data']=new getData();

and use your global variable at any place like global $get_data.

echo $get_data->data; //example

(note: This class mainly used for get the exact subdomainname from http_host. because some extra names combined before your subdomain is also applicable like www.example.domainname.tld. This return $_GET['data']='wwww' So my suggestion is to use the $_SERVER['http_host'] for get the exact values instead of using the $_SERVER['query_string'] or passed htaccess parameters in your index page)

6.Speed up the execution of this wildcard subdomains use N seconds in TTL - DNS SETTINGS.

7.Check the subdomain after your given ttl time (600 - 10 minutes) like => http://abc.domain.tld

(note: wildcard subdomains not override the existed subdomains. Because First priority always for your existed subdomains)