用php编写的在线通信录

我是开始学习php时,在win7上用iis搭建一个服务器,如果想通过外网访问这个网站,简易你下载一个花生壳,学生党,只是测试能用。
<?php
session_start();
define("N", TRUE);
if(empty($_SESSION["uid"])) {
	header("Location: ./login.html");
}
?>
<!doctype html>
<html>
<head>
<title>添加</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<link rel="stylesheet" href="css/index.css" />
<script type="text/javascript" src="js/calendar.js"></script>
</head>
<body>
<?php
	require_once "header.php";
?>
<div id = "add">
<h2 class = "title">添加信息</h2>
<form method = "post" action = "add_do.php">
<table cellpadding = "0" cellspacing = "0">
	<tr>
		<td>姓名:</td>
		<td><input type = "text" name = "username" /></td>
	</tr>
	<tr>
		<td>性别:</td>
		<td>
			男<input type = "radio" name = "usersex" value = "1" checked = "checked" />
			女<input type = "radio" name = "usersex" value = "0" />
		</td>
	</tr>
	<tr>
		<td>生日:</td>
		<td><input type = "text" onclick="new Calendar().show(this);" name = "userbirth" /></td>
	</tr>
	<tr>
		<td>电话:</td>
		<td><input type = "text" name = "usertel"></td>
	</tr>
	<tr>
		<td>地址:</td>
		<td><input type = "text" name = "useraddr"></td>
	</tr>
	<tr>
		<td colspan = "2" style = "text-align:center;">
		<input type = "submit" name = "sub" value = "提&nbsp;交" />
		</td>
	</tr>
</table>
</form>
</div>

<?php
	require_once "footer.php";
?>
</body>
</html>
编程技巧