php app in nginx subdirectory

server {
         listen 80;
         root /var/www/top/public;
         index index.php  index.html index.htm;
         server_name yourservername.com;

         location / {   
         try_files $uri $uri/ /index.php$is_args$args;     
         }
         
         location /nested {         
         alias /what/ever/path/public;         
         try_files $uri $uri/ @nested;         

              location ~ \.php$ {             
                   include snippets/fastcgi-php.conf;                
                   fastcgi_param SCRIPT_FILENAME $request_filename;                  
                   fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;         
                   }     
         }     

         location @nested {         
         rewrite /nested/(.*)$ /nested/index.php?/$1 last;     
         }

         location ~ \.php$ {         
         include snippets/fastcgi-php.conf;         
         fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;     
         }
}

Thanks a lot: https://serversforhackers.com/c/nginx-php-in-subdirectory