APACHE: Codeigniter - SEO

seo.php

### Please read description below : the following .htaccess file isn't enough ###

# 1. Activate URL rewriting
RewriteEngine On

# 2. If the base folder is different from /
#RewriteBase /xyz

# 3.a. Removes the "www" ...
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

# 3.b. ... or add it
#RewriteCond %{HTTP_HOST} ^(.*)$ [NC]
#RewriteRule ^(.*)$ http://www.%1/$1 [R=301,L]

# 4. Redirect "index.php" requests
RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC]
RewriteCond %{THE_REQUEST} !/system/.*
RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,L]

# 5. Redirect requests containing "index" if it isn't a file/folder
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{THE_REQUEST} ^GET.*index [NC]
RewriteCond %{THE_REQUEST} !/system/.*
RewriteRule (.*?)index/*(.*) /$1$2 [R=301,L]

# 6. Remove trailing slash if it isn't a folder
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)/$ /$1 [R=301,L]

# 7. URL rewrite for admin/connect controllers
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ^(admin|connect)(.*) [NC]
RewriteRule ^(.*)$ /index.php/$1 [L]

# 8. URL rewrite for pages which are not admin/connect controllers
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/?$ /index.php/site/$1 [L]