A simple (?) multilanguage site configuration for

.htaccess

# When opened on *.ru domain, show /content/ru/pagename.php
# When opened on other domain, show /content/en/pagename.php

Options -Indexes +FollowSymlinks
RewriteEngine On
RewriteBase /

# Prevent from multiple runs of this file
RewriteCond %{ENV:REDIRECT_WASHERE} !^$
RewriteRule ^ - [L]
RewriteCond %{ENV:WASHERE} !^$
RewriteRule ^ - [L]
RewriteRule ^ - [E=WASHERE:YES]

# Remove www prefix
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [L,R=301]

#######
# Here is the place for special magic
RewriteRule ^index/?$ / [L,R=301]
#######

# When accessing static files, return them directly
RewriteRule ^s/(.+)$ s/$1 [L]

# All other URLs should have trailing slashes
RewriteRule ^(.*[^/])$ $1/ [L,R=301]

# Choose language depending on domain
RewriteCond %{HTTP_HOST} \.ru$
RewriteRule ^ - [E=LANGUAGE:ru]
RewriteCond %{ENV:LANGUAGE} ^$
RewriteRule ^ - [E=LANGUAGE:en]

# Empty means «index.php», trailing slash means «.php»
RewriteRule ^$ index.php
RewriteRule ^(.*)/$ $1.php

# Convert page name to file name
RewriteRule ^(.*[^/])/?$ content/%{ENV:LANGUAGE}/$1 [L]