location PATHTOCHANGE {
       alias ALIASTOCHANGE;
       index spip.php;
       if (!-e $request_filename)
       {
        rewrite ^(.+)$ PATHTOCHANGE/spip.php?page=$1 last;
       }
       client_max_body_size 30m;
       location ~ [^/]\.php(/|$) {
           fastcgi_split_path_info ^(.+?\.php)(/.*)$;
           fastcgi_pass unix:/var/run/php5-fpm.sock;
           fastcgi_index spip.php;
           include fastcgi_params;
           fastcgi_param REMOTE_USER     $remote_user;
           fastcgi_param PATH_INFO       $fastcgi_path_info;
           fastcgi_param SCRIPT_FILENAME $request_filename;
       }
}