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Multisite network in wordpress
You need to install multisite network.
Suppose we install for www.example.com
I can create
www.example.com/aa where user name aa
www.example.com/bb where user name bb
I can do this manually
But I need user creation and domian/username creation from outside of WP
You will get how to create multisite for wp here
we need to execute below 2 lines outside of wp
wpmu_create_user( $domain, $password, $email )
wpmu_create_blog( $domain, $path, $title, $user_id , array( 'public' => 1 ), $current_site->id );