一个可分页的基于文本的PHP留言板

  •   2009-08-01/08:15
  •     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);
      $data=str_replace(" ","&nbsp;",$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".$size."条留言&nbsp;&nbsp;&nbsp;&nbsp;第".$page."页/共".$pages."页<br>";
      if($page>1){
        $prev=$page-1;
        echo "<a href="guest.php?".$prev."">&lt;&lt;</a>&nbsp;";
      }
      for($i=1;$i<=$pages;$i++){
        echo "&nbsp;<a href="guest.php?".$i."">".$i."</a>&nbsp;";
      }
      if($page<$pages){
        $next=$page+1;
        echo "<a href="guest.php?".$next."">&nbsp;&gt;&gt;</a>";
      }
      echo "</p></font><table width="650" border="0" cellspacing="0" cellpadding="0">";
      for($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>&nbsp;</td>";
        echo "<td colspan="5" width="575">".$buffer[4]."</td></tr><tr><td>&nbsp;</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。  

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