<?php interface IDb { function connect($host, $user, $pass, $db, $port); function escape_string($s, $strip_tags = true); function query($query, $die_on_error = true); function fetch_assoc($result); function num_rows($result); function fetch_result($result, $row, $param); function close(); function affected_rows($result); function last_error(); function last_query_error(); }