Apache rewrite_mod: RewriteRule path and query string

Question

I currently have a website with a standard web interface on index.php, and I made an iPhone-friendly version in iphone.php.
Both pages handle the same arguments.

It works fine when I manually go to .../iphone.php, but I'd like to rewrite anything on .../path/ and .../path/index.php to iphone.php if %{HTTP_USER_AGENT} contains mobile, and optionally add the query string (not sure if/when I'd need to add it).

So far, this is what I have in my .../path/.htaccess:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.+mobile.+$ [NC]
RewriteRule index.php?(.*) iphone.php?$1 [L]
RewriteRule index.php      iphone.php [L]

The problems are, it matches index.php in any subfolder, and it won't match .../path/?args…

Answer 1

How about

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^.*mobile.*$ [NC]
RewriteRule /path/index.php /path/iphone.php [QSA,L]

EDIT: QSA is Query string append, so you don't need to handle that differently. If you want you can add an extra parameter too, like:

RewriteRule /path/index.php /path/iphone.php?extra=param [QSA,L]

Answer 2

1. RewriteCond is applied to exactly one rewrite rule.
2. To match all user agents containing 'mobile' in it's name .* - 0 or more any character should be used in ^.+mobile.+$ statement.
3. RewriteRule by default doesn't include query string - [QSA] flag should be used to include query string.
4. RewriteRule uses regexp - you should use \. to escape dots.
5. RewriteRule automatically saves query string the same, if not specified another.

UPDATED:

Complete .htacess:

RewriteEngine On

RewriteCond %{HTTP_USER_AGENT} ^.*mobile.*$ [NC]
RewriteRule ^(.*)index\.php $1iphone.php [L]

RewriteCond %{HTTP_USER_AGENT} ^.*mobile.*$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteRule ^(.*)$ $1iphone.php [L]