How to use multiple if statements in Nginx

nginx-multiple-if.conf

set $posting 0; # Make sure to declare it first to stop any warnings

if ($request_method = POST) { # Check if request method is POST
  set $posting N; # Initially set the $posting variable as N
}

if ($geoip_country_code ~ (BR|CN|KR|RU|UA) ) { # Here we're using the Nginx GeoIP module to block some spammy countries
  set $posting "${posting}O"; # Set the $posting variable to itself plus the letter O
}

if ($posting = NO) { # We're looking if both of the above rules are set to spell NO
  return 403; # If it is then let's block them!
}