Using mod-rewrite with multiple pages - php

Question

Simplified Question
I changed domain.com/folder/client.php?id=1 to 1.domain.com with this .htaccess code
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(www.)?([^.]+).domain.com$ [NC]
RewriteRule ^$ /client.php?id=%2 [QSA,NC]
Now I want to change domain.com/folder/about.php?id=1 to 1.domain.com/about.
Is it possible ? or is there any other ways to do this?
Thank you :D
Old Question
In my directory, I have 2 pages (client.php, about.php). I've already set a wildcard subdomain to the page directory and changed domain.com/folder/client.php?id=1 to 1.domain.com. This is my .htaccess code :
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(www.)?([^.]+).domain.com$ [NC]
RewriteRule ^$ /client.php?id=%2 [QSA,NC]
Now, I need to add another page. So, in client.php page, there's a button to go to about.php page in the same directory. I tried 1.domain.com/about.php and it's not working.
Do I have to create another line of RewriteCond ? or is there any other ways to do this?
Thank you very much :D
Updated Code without working id
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(www.)?([^.]+).domain.com$ [NC]
RewriteCond %{REQUEST_URI} !^/about [NC]
RewriteRule ^$ /client.php?id=%2 [QSA,NC]
RewriteBase /
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?([^.]+)\.domain\.com$ [NC]
RewriteCond %{REQUEST_URI} ^/about [NC]
RewriteCond %{REQUEST_URI} !about\.php [NC]
RewriteRule . /about.php?id=%1 [L,QSA]
**The code resolved the text in url box. Let's say id=1. Now it's showing 1.domain.com/about.
the php code : `$_GET["id"]` is not specified.**
Thanks to faa for the edit :D
The Full Solution
Refer Using mod-Rewrite with 5 pages (wildcard sub-domain)

Answer 1

You may try this:
Options +FollowSymLinks
RewriteEngine on
## This is the actual rule-set that works as it is according to the OP
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(www.)?([^.]+).domain.com$ [NC]
# Added to exclude folder `/about`
RewriteCond %{REQUEST_URI} !^/about [NC]
RewriteRule ^$ /client.php?id=%2 [L,QSA,NC]
## This is the additional rule set
RewriteBase /
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?([^.]+)\.domain\.com$ [NC]
RewriteCond %{REQUEST_URI} ^/about [NC]
RewriteCond %{REQUEST_URI} !about\.php [NC]
RewriteRule . http://domain.com/folder/about.php?id=%1 [L,QSA]
Maps silently
http://N.domain.com/about with or without trailing slash
To:
http://domain.com/folder/about.php?id=N
For permanent and visible redirection, replace [L,QSA] with [L,R=301,QSA]