if ( ! function_exists('db_next_result'))
{
	/*
	 * Replaces the CI_DB_mysqli_result::next_result() method that the old
	 * CodeIgniter 2 core was patched with. A stored procedure CALL returns
	 * an extra (status) result set, which must be drained before the next
	 * query or MySQL reports "Commands out of sync".
	 */
	function db_next_result($db)
	{
		if ( ! is_object($db) || ! ($db->conn_id instanceof mysqli))
		{
			return FALSE;
		}
		while (mysqli_more_results($db->conn_id) && mysqli_next_result($db->conn_id))
		{
			if ($result = mysqli_store_result($db->conn_id))
			{
				mysqli_free_result($result);
			}
		}
		return TRUE;
	}
}