apache

<IfModule mod_rewrite.c>

Options +FollowSymlinks -Multiviews

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^(.*)$ index.php [L,E=PATH_INFO:$1]

</IfModule>

Nginx

location / {
        if (!-e $request_filename){
                rewrite  ^(.*)$  /index.php?s=$1  last;   break;
        }
}