Silex under subcategory with Nginx

dtsilex.conf

location /your_subdirectory {
    alias /var/www/html/your_subdirectory/web;
    index index.php index.html;
    if (-f $request_filename) {
        break;
    }
    rewrite ^(.*)$ /your_subdirectory/index.php last;
}

location ~ /your_subdirectory/(.+)\.php(/|$) {
    set $script $uri;

    if ($uri ~ "/your_subdirectory/(.+\.php)(/|$)") {
        set $script $1;
    }

    include /etc/nginx/fastcgi_params;
    fastcgi_split_path_info ^(.+\.php)(/.*)$;
    fastcgi_pass  127.0.0.1:9002;
    fastcgi_index  index.php;

    fastcgi_param  SCRIPT_FILENAME  $document_root/your_subdirectory/web/$script;
}