如何让htaccess动态地为每个用户自动创建子域

I want to create the sub domain for each single user dynamically. i have tried many solution but still unable to accomplice this. can you people provide us the main basic guide for this purpose?

we want this URL: RewriteRule ^([A-zA-Z0-9]+)$ agt_index.php?username=$1

this gives us: www.abc.com/abcuser

we want to change the URL to this: abcuser.abc.com

please provide us in detail help for this.

You need to first of all have a vhost set up with wildcard subdomains.

<VirtualHost *:80>
    DocumentRoot /var/www/vhosts/example.com/
    ServerName www.example.com
    ServerAlias *.example.com

</VirtualHost>

After this, it would make more sense to use PHP to parse the subdomain and if it its not www or empty, then regard it as a possible username and work from there.

$subdomain = substr($_SERVER['HTTP_HOST'], 0, strpos($_SERVER['HTTP_HOST'], 'example.com'));