这部分功能只有管理员和该帖子作者可以使用，能随时修改该帖子，也能把它删除。不过要注意，删除某个帖子会把它的子帖子也删除，如果是主题的根帖子被删除了，则整个主题都被删除。
编辑/删除帖子的实现文件是edit.php，其代码如下：
<?
echo "<div align=center><h2>编辑/删除帖子</h2></div><br>";
if(!session_is_registered("username"))
{
echo "<div align=center><h2><font color=red>您还没注册，不能管理帖子</font></h2></div>";
echo "<script langue='javascript'>history.go(-1)</script>";
}
else if(($username != $master)&&($username != get_author($titleid, $noteid)))
{
echo "<div align=center><h2><font color=red>只有管理员和发帖人才能编辑或删除帖子</font></h2></div>";
echo "<script langue='javascript'>history.go(-1)</script>";
}
else //身份验证通过，可以修改/删除帖子
{
if($submit == '返回')
{
echo "<script langue='javascript'>history.go(-2)</script>";
}
else if($submit == '删除该帖子')
{
delete_note($titleid, $noteid);
if($noteid == '0.')
echo "<meta http-equiv='Refresh' content='0; url=forum.php?action=themelist'>";
else
{
$theme = get_title($titleid);
$notes = get_notes($titleid);
echo "<meta http-equiv='Refresh' content='0; url=forum.php?action=read&id=$titleid&title=$theme¬es=$notes'>";
}
}
else if($submit == '确定修改')
{
edit_note($titleid, $noteid, $theme, ascii2html($content));
$notes = get_notes($titleid);
$theme = get_title($titleid);
echo "<meta http-equiv='Refresh' content='0; url=forum.php?action=read&id=$titleid&title=$theme¬es=$notes'>";
}
else
{
echo "<div align=center><h3><font color=green>身份验证......通过！</font></h3></div>";
$content = get_content($titleid, $noteid);
echo "<div align=center><form name='edit' method='post' action='forum.php?action=edit'>";
echo "<input type='hidden' name='titleid' value=$titleid>";
echo "<input type='hidden' name='noteid' value=$noteid>";
echo "标题：<input type='text' name='theme' size='80' value=$theme>";
$content = html2ascii($content);
$content = str_replace("<br>", "n", $content);
echo "<textarea name='content' cols=95 rows=12>$content</textarea>";
echo "<input type='submit' name='submit' value='确定修改'> ";
echo "<input type='reset' name='reset' value='恢复原状'> ";
echo "<input type='submit' name='submit' value='返回'> ";
echo "<input type='submit' name='submit' value='删除该帖子'>";
echo "</form></div>";
if($noteid == '0.')
echo "<div align=center><font color=red>请注意，该帖子是该主题的首帖子，删除该帖会删除整个主题</font></div>";
else
echo "<div align=center><font color=red>请注意，如果删除该帖，其子帖也会被删除</font></div>";
}
}
?>
它需要用到不少的记录文件访问函数，下面一并列出：
<?
//节选自funcdef.php
//获取某帖子的发帖人名字
function get_author($titleid, $noteid)
{
$fp = fopen("rec/$titleid", "r");
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = strtok($rows, "t");
if($noteid == $recid)
{
strtok("t");
strtok("t");
$author = strtok("t");
break;
}
}
fclose($fp);
return $author;
}
//根据ID获取某主题的大标题
function get_title($titleid)
{
$fp = fopen("rec/$titleid", "r");
$rows = fgets($fp, MAX_READ_BYTES);
fclose($fp);
strtok($rows, "t");
return strtok("t");
}
//获取某帖子的内容
function get_content($titleid, $noteid)
{
$fp = fopen("rec/$titleid", "r");
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = strtok($rows, "t");
if($noteid == $recid)
{
$content = substr($rows, strrpos($rows, "t") + 1);
break;
}
}
fclose($fp);
return $content;
}
//将字符串中的换行、空格替换成html代码
function ascii2html($content)
{
$content = str_replace("n", "<br>", $content);
$content = str_replace(" ", " ", $content);
$content = str_replace("r", "", $content);
$content = str_replace("t", "", $content);
$content = str_replace("<", "<", $content);
$content = str_replace(">", ">", $content);
$content = stripslashes($content);
return $content;
}
//将html代码中的换行空格替换成普通ASCII字符
function html2ascii($content)
{
$content = str_replace("<br>", "n", $content);
$content = str_replace(" ", " ", $content);
$content = str_replace("<", "<", $content);
$content = str_replace(">", ">", $content);
return $content;
}
//修改某一帖子
function edit_note($titleid, $noteid, $theme, $content)
{
//修改?主题文件内容
$fp = fopen("rec/".$titleid, "r");
$newfp = fopen("rec/".$titleid.".bak", "w");
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = strtok($rows, "t");
if($noteid == $recid) //要修改的帖子
{
strtok("t"); //title
$face = strtok("t"); //face
$maker = strtok("t"); //maker
$thmestr = strtok("t"); //timestr
$ip = strtok("t"); //ip
$oicq = strtok("t"); //oicq
$email = strtok("t"); //email
$homepage = strtok("t"); //homepage
fwrite($newfp, "$recidt");
fwrite($newfp, "$themet");
fwrite($newfp, "$facet");
fwrite($newfp, "$makert");
fwrite($newfp, "$timestrt");
fwrite($newfp, "$ipt");
fwrite($newfp, "$oicqt");
fwrite($newfp, "$emailt");
fwrite($newfp, "$homepaget");
fwrite($newfp, "$contentn");
}
else
{
fwrite($newfp, $rows);
}
}
fclose($newfp);
fclose($fp);
copy("rec/".$titleid.".bak", "rec/".$titleid);
unlink("rec/".$titleid.".bak");
//如果是根帖子，则要修改themelist文件内容
if($noteid == '0.')
{
$fp = fopen("rec/themelist", "r");
$newfp = fopen("rec/themelist.bak", "w");
$rows = fgets($fp, MAX_READ_BYTES);
fwrite($newfp, $rows);
$rows = fgets($fp, MAX_READ_BYTES);
fwrite($newfp, $rows);
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = intval(strtok($rows, "t"));
if($recid != $titleid)
{
fwrite($newfp, $rows);
}
else //如果是要修改的行
{
strtok("t");
$recmaker = strtok("t");
$rectime = strtok("t");
$newnum = intval(strtok("t"));
fwrite($newfp, $recid."t");
fwrite($newfp, $theme."t");
fwrite($newfp, $recmaker."t");
fwrite($newfp, $rectime."t");
fwrite($newfp, "$newnumn");
}
}
fclose($newfp);
fclose($fp);
copy("rec/themelist.bak", "rec/themelist");
unlink("rec/themelist.bak");
}
}
//删除某帖子的函数
function delete_note($titleid, $noteid)
{
if($noteid == '0.')
{
unlink("rec/$titleid");
$delnum = get_notes($titleid);
}
else
{
//修改?主题文件内容
$fp = fopen("rec/".$titleid, "r");
$newfp = fopen("rec/".$titleid.".bak", "w");
$delnum = 0;
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = strtok($rows, "t");
if(substr($recid, 0, strlen($noteid)) == $noteid)
{
$delnum ++;
continue;
}
else
fwrite($newfp, $rows);
}
fclose($newfp);
fclose($fp);
copy("rec/".$titleid.".bak", "rec/".$titleid);
unlink("rec/".$titleid.".bak");
}
//修改themelist文件
$fp = fopen("rec/themelist", "r");
$newfp = fopen("rec/themelist.bak", "w");
$rows = fgets($fp, MAX_READ_BYTES);
if($noteid != '0.')
fwrite($newfp, $rows);
else
fwrite($newfp, strval(intval($rows) - 1)."n");
$rows = fgets($fp, MAX_READ_BYTES);
fwrite($newfp, strval(intval($rows) - $delnum)."n");
while(!feof($fp))
{
$rows = fgets($fp, MAX_READ_BYTES);
$recid = intval(strtok($rows, "t"));
if($recid != $titleid)
{
fwrite($newfp, $rows);
}
else //如果是要修改的行
{
if($noteid == '0.')
continue;
else
{
$theme = strtok("t");
$recmaker = strtok("t");
$rectime = strtok("t");
$newnum = intval(strtok("t")) - $delnum;
fwrite($newfp, $recid."t");
fwrite($newfp, $theme."t");
fwrite($newfp, $recmaker."t");
fwrite($newfp, $rectime."t");
fwrite($newfp, "$newnumn");
}
}
}
fclose($newfp);
fclose($fp);
copy("rec/themelist.bak", "rec/themelist");
unlink("rec/themelist.bak");
}
?>
自此，这个论坛的原代码基本上都给出来了，欢迎大家就它的设计结构以及实现算法提出宝贵意见。
感兴趣的朋友可以到下面的地址看看该论坛的演示：http://youziyun.oso.com.cn/forum/forum.php
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