<IfModule mod_rewrite.c>
  Options +FollowSymlinks -Multiviews
  RewriteEngine On

  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)\.php(.*)$ $1.php?s=$2 [QSA,PT,L]

  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)$ index.php?s=$1 [QSA,PT,L]
</IfModule>