location / {
    index index.html index.htm index.PHP;
    try_files $uri $uri/ /index.PHP?$query_string ; 
}

if (!-d $request_filename)
{
   rewrite ^/(.+)/$ /$1 permanent;
}

if ($request_uri ~* index/?$)
{
     rewrite ^/(.*)/index/?$ /$1 permanent;
}

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

error_page 404 500 502 503 504 error.html;
location = error.html {
    root  html;
}