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"> 
  
      <div align="center"><b>供电9901网上
空间留言板</b></div> 
  
    </td> 
  
  </tr> 
  
<tr><td><div align="right"><a href="<? echo $home; ?>">[返回首页]</a></div></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> 
  
  <div 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> 
  
  </div> 
  
  </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> 
  
<div align="center">本网站由<a href="mailto:gdgzljx@163.net">疯狂电脑工作室</a>制作   2000</div></td></tr></table> 
  
</body></html>   
  
    大家可到gd9901.oso.com.cn看看效果,有什么问题请E_Mail至jaayee@21cn.com。