dyanmic virtualhost for nginx

virtual-hosts.conf

server {
        listen      80 default;
        listen      [::]:80 default;
        server_name  _;
        charset utf-8;
	      access_log  off;
        root   /var/www/$http_host/wwwroot/;

        location / {
	          index index.html index.htm index.php;
        }

        error_page  404              /404.html;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        location ~ \.php$ {
            include        fastcgi_params;
            fastcgi_pass   127.0.0.1:65534;
            fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
        }

        location ~ /\.ht {
            deny  all;
        }
    }