# First version
# mod_rewrite is required
<IfModule mod_rewrite.c>
  # Start rewrite engine and set the root path
  RewriteEngine on
  RewriteBase /

  # Permanent move /sitemap.xml --> /sitemap
  RewriteCond %{REQUEST_URI} ^/sitemap\.xml$
  RewriteRule ^sitemap\.xml$ /sitemap [R=301,L]

  # Redirect all requests to index.php (exept valid addresses)
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule !\.(css|js|icon|zip|rar|png|jpg|gif|pdf)$ index.php [L]
</IfModule>


# Second version
# mod_rewrite is required
<IfModule mod_rewrite.c>
  # Start rewrite engine and set the root path
  RewriteEngine on
  RewriteBase /

  # Redirect all requests to index.php (exept valid addresses)
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  # Exeption - permanent move sitemap.xml --> /sitemap
  RewriteRule ^sitemap\.xml$ /sitemap [R=301,L]
  RewriteRule !\.(css|js|icon|zip|rar|png|jpg|gif|pdf)$ index.php [L]
</IfModule>