How to Let PHP to Create Subdomain Automatically For Each User

How to let PHP to create subdomain automatically for each user?

You're looking to create a custom A record.

I'm pretty sure that you can use wildcards when specifying A records which would let you do something like this:

*.mywebsite.example       IN  A       127.0.0.1

127.0.0.1 would be the IP address of your webserver. The method of actually adding the record will depend on your host.

Doing it like http://mywebsite.example/user would be a lot easier to set up if it's an option.

Then you could just add a .htaccess file that looks like this:

Options +FollowSymLinks

RewriteEngine On
RewriteRule ^([aA-zZ])$  dostuff.php?username=$1

In the above, usernames are limited to the characters a-z

The rewrite rule for grabbing the subdomain would look like this:

RewriteCond %{HTTP_HOST} ^(^.*)\.mywebsite.example
RewriteRule (.*)  dostuff.php?username=%1

However, you don't really need any rewrite rules. The HTTP_HOST header is available in PHP as well, so you can get it already, like

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

When you auto-create subdomains on user signup does it create a new website or gives appearance of a website?

Others have answered the main points of your question, but I did want to touch on what you call the "illusion" of a website.

There are a few different ways to serve a given application in a domain, subdomain or directory, from static files, to a single file handling every request no matter what path or domain was requested. No method is more or less "real" than any other. The only method I would call an "illusion" would be a website masked behind another website using frames, which is generally a Really Bad Idea. (Try bookmarking on a site where the URL doesn't change as you click around.)

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