这是一开始进入该论坛看到的界面，这部分还包括了分页显示系统。该界面文件listtheme.php在$action参数没有指定或指定为themelist的时候被包含进来。下面是该文件的代码：
<script language="JavaScript">
function MM_jumpMenu(targ,selObj,restore)
{
eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
if (restore) selObj.selectedIndex=0;
}
</script>
<?
if(!isset($listfrom))
$listfrom = 1;
get_theme($listfrom, $themeid, $theme, $maker, $maketime, $notes);
echo "<table width='100%' border='1'>";
echo "<tr bgcolor='#006600'>";
echo "<th width='10%'><div align='center'><font color='#FFFFFF'>序号</font></div></th>";
echo "<th width='45%'><div align='center'><font color='#FFFFFF'>主题</font></div></th>";
echo "<th width='15%'><div align='center'><font color='#FFFFFF'>创建人</font></div></th>";
echo "<th width='20%'><div align='center'><font color='#FFFFFF'>创建时间</font></div></th>";
echo "<th width='10%'><div align='center'><font color='#FFFFFF'>帖子数</font></div></th>";
echo "</tr>";
for($i = 0; $i < count($themeid); $i ++)
{
if($i % 2 == 0)
$bgcolor = '#CCFF99';
else
$bgcolor = '#A9FFA9';
echo "<tr bgcolor= $bgcolor>";
echo "<td width='10%'><div align='center'>$themeid[$i]</div></td>";
echo "<td width='45%'><div align='center'><a href = 'forum.php?action=read&id=$themeid[$i]&title=$theme[$i]¬es=$notes[$i]' title = '进入"$theme[$i]"主题'>$theme[$i]</a></div></td>";
echo "<td width='15%'><div align='center'>$maker[$i]</div></td>";
echo "<td width='20%'><div align='center'>$maketime[$i]</div></td>";
echo "<td width='15%'><div align='center'>$notes[$i]</div></td>";
echo "</tr>";
}
echo "</table><br>";
//下面就是分页实现代码
$total_theme = get_total_theme();
$total_page = intval($total_theme / THEMES_IN_PAGE);
$current_page = intval($listfrom / THEMES_IN_PAGE + 1);
if($total_theme % THEMES_IN_PAGE)
$total_page ++;
echo "<table width=100% border=0><tr><td width=50%>";
if($listfrom <= THEMES_IN_PAGE)
{
echo "[首页][前页] ";
}
else
{
echo "[<a href='forum.php?action=themelist&listfrom=1'>首页</a>]";
echo "[<a href='forum.php?action=themelist&listfrom=".($listfrom - THEMES_IN_PAGE)."'>前页</a>] ";
}
echo "第".$current_page."/".$total_page."页 ";
if($total_theme - $listfrom < THEMES_IN_PAGE)
echo "[后页][末页]</td>";
else
{
echo "[<a href='forum.php?action=themelist&listfrom=".($listfrom + THEMES_IN_PAGE)."'>后页</a>]";
echo "[<a href='forum.php?action=themelist&listfrom=".($total_theme - $total_theme % THEMES_IN_PAGE + 1)."'>末页</a>] </td>";
}
echo "<form name=sortsel>";
$htmlstr = "<td width=20%>转到<select name='gopage' onChange="MM_jumpMenu('parent',this,0)"><option selected>---</option>";
for($i = 1; $i <= $total_page; $i ++)
{
if($i != $current_page)
{
$go = ($i - 1) * THEMES_IN_PAGE + 1;
$htmlstr = $htmlstr."<option value='forum.php?action=themelist&listfrom=$go'>$i</option>";
}
}
echo $htmlstr."</select>页</td></form>";
echo "<form name='searchform' method='post' action='forum.php?action=search'><td>搜索：<input type='text' name='keyword' size=10><input type='Submit' name='submit' value='搜索'><td></form>";
echo "</table></tr>";
?>
前面有一段Javascript代码是定义转跳页面下拉菜单的响应函数MM_jumpMenu()的。其中的get_theme()函数是这段代码的重点所在，它是把所要求的主题的相关信息读入五个数组内，然后才把五个数组的内容分别显示出来。在funcdef.php文件中，get_theme()函数的定义如下：
<?
//将主题列表中指定范围的主题ID、主题内容、创建人、创建时间、帖子数目列入五个数组中
function get_theme($themefrom, &$themeid, &$theme, &$maker, &$maketime, &$notes, $themenum = THEMES_IN_PAGE)
{
if(!file_exists("rec/themelist"))
{
$fp = fopen("rec/themelist", "w+");
fwrite($fp, "0n0n");
fclose($fp);
}
$fp = fopen("rec/themelist", "r");
fgets($fp, MAX_READ_BYTES);
fgets($fp, MAX_READ_BYTES);
$begin = ftell($fp);
$curpos = filesize("rec/themelist") - 1;
fseek($fp, $curpos);
for($i = 0; $i < $themefrom; $i ++)
{
while(fgetc($fp) != "n" && $curpos >= $begin)
{
fseek($fp, --$curpos);
}
$curpos -= 2;
fseek($fp, $curpos);
}
//连续倒序读入文件
for($i = 0; $i < $themenum && $curpos >= $begin; $i ++)
{
while(fgetc($fp) != "n" && $curpos >= $begin)
{
fseek($fp, --$curpos);
}
$rows = fgets($fp, MAX_READ_BYTES);
$themeid[$i] = strtok($rows, "t");
$theme[$i] = strtok("t");
$maker[$i] = strtok("t");
$maketime[$i] = strtok("t");
$notes[$i] = strtok("t");
$curpos -= 2;
fseek($fp, $curpos);
}
fclose($fp);
}
?>
注意到它是倒序读入themelist文件的，$themefrom是指从倒数第几个主题开始读入，$themenum是读入的主题个数，一般就等于每页显示的个数。
而分页代码中的get_total_theme()函数是取得该论坛现有的总主题数目。在funcdef.php文件中定义如下：
<?
//获得主题总数
function get_total_theme()
{
if(!file_exists("rec/themelist"))
{
$fp = fopen("rec/themelist", "w+");
fwrite($fp, "0n0n");
fclose($fp);
}
$fp = fopen("rec/themelist", "r");
$rows = fgets($fp, MAX_READ_BYTES);
fclose($fp);
return trim($rows);
}
?>
下次将介绍主题显示部分，这是该论坛的特色，主题中的帖子具有树状结构。(未完待续)
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