小弟初学php，编了一个留言板程序，自我感觉良好，故厚着脸皮放了上来，请各位大哥指正。源程序如下：
<?php
//文件名：guest.php
//设定部分
$guestfile="guest";//纪录留言的文本文件
$home="index.html";//返回的主页
$imagedir="image"; //图像文件的目录
$backimage=$imagedir."/bk.gif";//背景图像
$backcolor="#ceffff";//背景颜色,在$backimage=""时起作用
?>
<html>
<head>
<?php
if($query_string!="") {
$page = $query_string;
} else {
$page = 1;
}
if($mode=="add"){
$name=htmlspecialchars(trim($name));
$title=htmlspecialchars(trim($title));
$data=nl2br(htmlspecialchars($data));
$data=str_replace("r","",$data);
$data=str_replace("x0a","",$data);
$data=str_replace(" "," ",$data);
if($data=="") $data=" ";
$e_mail=trim($e_mail);
if($e_mail=="") $e_mail=0;
$url=trim($url);
if($url=="http://" || $url=="") $url=0;
$time=date("y")."年".date("m")."月".date("d")."日[".date("h").":".date("i").":".date("s")."]";
if($name=="" || $title==""){
echo "<script language="javascript">n";
echo " alert("请至少输入姓名与留言标题。");n";
echo "history.back();";
echo "</script></head></html>n";
exit;
}
$adddata=$name."t".$e_mail."t".$url."t".$title."t".$data."t".$icon."t".$time."n";
if(file_exists($guestfile)){
$filebuffer=file($guestfile);
if(sizeof($filebuffer)>100){
for($i=0;$i<100;$i++)
$newbuffer[i]=$filebuffer[i];
}
else{
$newbuffer=$filebuffer;
}
$fp=fopen($guestfile,"w");
fputs($fp,$adddata);
fclose($fp);
$buffer=implode("",$newbuffer);
$fp=fopen($guestfile,"a");
fputs($fp,$buffer);
fclose($fp);
}
else{
$fp=fopen($guestfile,"w");
fwrite($fp,$adddata);
fclose($fp);
}
}
?>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>留言板</title>
<style>
a{text-decoration:none; font-size:9pt; color:blue}
a:visited {text-decoration:none; color:009999}
a:hover {color:red; text-decoration:underline}
td{font-size:9pt;line-height:14pt}
p{font-size:9pt}
</style>
</head>
<?php
if($backimage!="" && file_exists($backimage)){
echo "<body background="".$backimage."" bgproperties="fixed">n";
}
else{
echo "<body bgcolor="".$backcolor."">n";
}
?>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="#9999ff">
<td height="28">
<p align="center"><b>供电9901网上空间留言板</b></p>
</td>
</tr>
<tr><td><p align="right"><a href="<? echo $home; ?>">[返回首页]</a></p></td></tr>
</table>
<font size="2">
<form method="post" action="guest.php">
<input type="hidden" name="mode" value="add">
<p>姓名:
<input type="text" name="name" size="20">
<br>
e_mail:
<input type="text" name="e_mail" size="20">
<br>
主页:
<input type="text" name="url" value="http://" size="30">
<br>
留言标题:
<input type="text" name="title" size="50">
<br>
留言内容:(不支持html)<br>
<textarea name="data" rows="5" cols="60"></textarea>
<p id="layer1" style="position:absolute; left:460px; top:152px; width:301px; height:104px; z-index:1">
<p>表情:</p>
<p>
<input type="radio" name="icon" value="1">
<img src="<? echo $imagedir."/1.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="2">
<img src="<? echo $imagedir."/2.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="3">
<img src="<? echo $imagedir."/3.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="4" checked>
<img src="<? echo $imagedir."/4.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="5">
<img src="<? echo $imagedir."/5.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="6">
<img src="<? echo $imagedir."/6.gif"; ?>" width="15" height="15"><br>
<input type="radio" name="icon" value="7">
<img src="<? echo $imagedir."/7.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="8">
<img src="<? echo $imagedir."/8.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="9">
<img src="<? echo $imagedir."/9.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="10">
<img src="<? echo $imagedir."/10.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="11">
<img src="<? echo $imagedir."/11.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="12">
<img src="<? echo $imagedir."/12.gif"; ?>" width="15" height="15"><br>
<input type="radio" name="icon" value="13">
<img src="<? echo $imagedir."/13.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="14">
<img src="<? echo $imagedir."/14.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="15">
<img src="<? echo $imagedir."/15.gif"; ?>" width="15" height="15">
<input type="radio" name="icon" value="16">
<img src="<? echo $imagedir."/16.gif"; ?>" width="15" height="15"> </p>
</p>
</p>
<p align="center">
<input type="submit" name="b1" value="写入">
<input type="reset" name="b2" value="重写">
</p>
</form>
<hr>
<?php
if(!file_exists($guestfile)){
echo "<p align="center">没有留言</p>";
}
else{
$filebuffer=file($guestfile);
$size=sizeof($filebuffer);
$pages=ceil($size/20);
echo "<p align="center">共".$size."条留言 第".$page."页/共".$pages."页<br>";
if($page>1){
$prev=$page-1;
echo "<a href="guest.php?".$prev.""><<</a> ";
}
for($i=1;$i<=$pages;$i++){
echo " <a href="guest.php?".$i."">".$i."</a> ";
}
if($page<$pages){
$next=$page+1;
echo "<a href="guest.php?".$next.""> >></a>";
}
echo "</p></font><table width="650" border="0" cellspacing="0" cellpadding="0">";
for($i=($page-1)*20; $i<$page*20 && $i<$size; $i++){
$buffer=explode("t",$filebuffer[$i]);
echo "<tr><td valign="top" width="25"><img src="".$imagedir."/".$buffer[5].".gif"></td>";
echo "<td valign="top" width="250"><p align="left">".$buffer[3]."</p></td>";
echo "<td valign="top" width="80"><p align="left"><b>(".$buffer[0].")</b></p></td>";
echo "<td valign="top" width="35"><p align="center">";
if($buffer[2]!="0"){
echo "<a href="".$buffer[2]."">主页</a>";
}
else{
echo "主页";
}
echo "</p></td>";
echo "<td valign="top" width="35"><p align="center">";
if($buffer[1]!="0"){
echo "<a href="mailto:".$buffer[1]."">e_mail</a>";
}
else{
echo "e_mail";
}
echo "</p></td>";
echo "<td valign="top" width="175"><p align="left">".$buffer[6]."</p></td>";
echo "</tr><tr><td> </td>";
echo "<td colspan="5" width="575">".$buffer[4]."</td></tr><tr><td> </td></tr>";
}
}
?>
</table><hr><table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td>
<p align="center">本网站由<a href="mailto:gdgzljx@163.net">疯狂电脑工作室</a>制作 2000</p></td></tr></table>
</body></html>