下面的PHP代码是该论坛主程序的框架forum.php文件：
<?
@session_start();
require("funcdef.php");
if($submit == "登录")
{
if(checkuser($username, $password) == true)
{
session_register("username");
$headstr = "Location:forum.php?".session_name()."=".session_id();
header($headstr);
}
else
{
include("loginerr.php");
}
}
if($submit == "注销")
{
session_unregister("username");
$headstr = "Location:forum.php?".session_name()."=".session_id();
header($headstr);
}
?>
<html>
<head>
<title>我的论坛</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<?
if(!isset($action))
$action = "themelist";
@session_start();
if($action == 'themelist') //列出主题
{
echo "<body bgcolor='#CCFFCC'>";
echo "<table width='100%' border='0'><tr><td width='400'>";
echo "<h1 align='center'><i><font color='#990000'>MYFORUM BETA1.0</font></i></h1>";
echo "</td><td width='350' valign='baseline'>";
echo "<div align='center'><font color='#6600CC'>";
if(!session_is_registered("username"))
{
echo "<form name='login'>";
echo "名字：";
echo "<input type='text' name='username' maxlength='16' size='10'> ";
echo "密码：";
echo "<input type='password' name='password' maxlength='16' size='10'> ";
echo "<input type='submit' name='submit' value = 登录>";
echo "</form>";
}
else
{
echo "欢迎光临！".htmlspecialchars($username)."! ";
echo "<a href = forum.php?submit=注销>取消登录</a>";
}
echo "</font></div></td></tr></table>";
echo "<table width='100%' border=0><td><div align='left'>";
echo "共有".get_total_theme()."个主题";
echo " ".get_total_note()."个帖子";
echo "</div></td><td><div align='right'>";
$str = "forum.php?action=addnew&".session_name()."=".session_id();
echo "<a href=$str title='创建新的主题'>加新主题</a> ";
echo "<a href=$home_url title='回到主页'>返回主页</a></div></td></table>";
include("listtheme.php"); //列出主题列表
}
else if($action == 'read') //读某一主题的树状内容
{
if(isset($id)&&isset($title))
include("listtree.php");
}
else if($action == 'addnew')//加新主题
{
include("addnew.php");
}
else if($action == 'reply') //回复主题
{
include("reply.php");
}
else if($action == 'edit') //编辑/删除某个帖子
{
include("edit.php");
}
else if($action == 'search')//主题检索
{
include("search.php");
}
?>
</body>
</html>
这只是一个框架，各个部分的具体实现代码还没给出。下次将介绍用户登录部分。（未完待续）
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