MySQLi is the replacement for MySQL. Since the mysql library will disappear in the future, the mysqli is there to replace it.
Still isn't correct. $sQry doesn't exist anywhere here, so $replied will be set without a resource.
As of PHP 5.5, the MySQL library has been officially deprecated. It is recommended to move to either MySQLi or PDO libraries for your mysql connectivity. See here for help choosing which interface you prefer: http://php.net/manual/en/mysqlinfo.api.choosing.php