How Can I Automatically Create User Subdomains with PHP?

Create Subdomains Automatically for Users with PHP

You're aiming to establish a customized A record for each user's subdomain. Most likely, you can employ wildcards in the A record specification. An example could be:

*.mywebsite.example       IN  A       127.0.0.1

Here, 127.0.0.1 represents the IP address of your webserver. The specific method for adding this record will vary depending on your hosting provider.

Next, you'll need to configure your webserver to handle all subdomains:

• Nginx: server_name .mywebsite.example
• Apache: ServerAlias *.mywebsite.example

Regarding accessing .htaccess, rewrite rules aren't necessary. You can obtain the HTTP_HOST header directly in PHP:

$username = strtok($_SERVER['HTTP_HOST'], ".");

If you lack DNS/webserver config access, using a direct URL like http://mywebsite.example/user is a more straightforward option, if feasible.

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