auto4certbot/docs/nginx_examples/nginx/templates/index_php.conf

 location / {
   if ($http_host ~* "^www\.(.+)$"){
   rewrite ^(.*)$ http://%1/$1 redirect; 
   } 
   if (!-e $request_filename){ 
   rewrite ^(.*)$ /index.php; 
   }
   index   index.htm index.html index.php;
 }