if (!-e $request_filename) {
    set $test P;
}
if ($uri !~ ^/(plesk-stat|webstat|webstat-ssl|ftpstat|anon_ftpstat|awstats-icon|internal-nginx-static-location)) {
    set $test "${test}C";
}
if ($test = PC) {
    rewrite ^/(.*)$ /index.php?$1;
}