removing .php from my site URL's using htaccess, now wordpress doesn't work

Question

My sites been using the below code to remove the .PHP from the end of the URL's

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/$ $1.php
RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php

I've now installed WordPress in /clients/ on the folder but it's not working as it's rewriting WordPress as well which i don't want it to do but I'm not sure how to fix the above code to stop it happening in the sup folder.

Thanks

Full .htaccess

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/$ $1.php
RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]

compress text, html, javascript, css, xml:

AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript

Or, compress certain file types by extension:

SetOutputFilter DEFLATE

Answer 1

In the /clients/ folder add an .htaccess file with the following:-

RewriteEngine off

in it. This turns off mod_rewrite for that folder and it's children.

Voila