php分页问题 系统提示未定义变量Undefined variable: php_self
这个页面是一个可以正常显示列表的页面，单击“下一页”时，页数会发生变化，但是页面内容还是显示的第一页。系统提示第72和79行未定义变量Undefined variable: php_self 我应该怎样修改下？
<?php<br>/*error_reporting(E_ALL ^ E_NOTICE);*/<br>//######################课题列表##########################<br> include "config.php";<br> include "header.php";<br>?> <br><meta http-equiv="Content-Type" content="text/html; charset=GB2312"><br><br><link href="style.css" rel="stylesheet" type="text/css"><br><title>课题列表</title><br><style type="text/css"><br><!--<br>.STYLE1 {font-size: 14px}<br>--><br></style><br><table width="740" border="0" cellspacing="1" cellpadding="0" bgcolor="#333333" align="center"><br> <tr> <br> <td width="60" height="30" bgcolor="#FFFFFF"> <div align="center" class="text"> <p class="STYLE1">课题编号</p></div> </td><br> <td width="300" height="30" bgcolor="#FFFFFF"> <div align="center" class="title STYLE1">课题名称</div> </td><br> <td width="85" height="30" bgcolor="#FFFFFF"> <div align="center" class="STYLE1">指导教师</div></td><br> <td width="60" height="30" bgcolor="#FFFFFF"> <div align="center" class="STYLE1">职称</div> </td><br> <td width="60" height="30" bgcolor="#FFFFFF"> <div align="center" class="title STYLE1">可选人数</div> </td><br> <td width="80" height="30" bgcolor="#FFFFFF" class="title"><div align="center" class="STYLE1">选题情况</div> </td> <br> <td width="60" height="30" bgcolor="#FFFFFF" class="title"><div align="center" class="STYLE1">状态</div> </td><br> <td width="60" height="30" bgcolor="#FFFFFF" class="title"><div align="center" class="STYLE1">详细资料</div> </td><br> </tr><br><?php<br> $n=0; <br> $query=mysql_query("select count(*) as sm from jiaoshi");<br> mysql_query("set names 'GB2312'");<br> $row=mysql_fetch_array($query);<br> $count=$row['sm'];<br> if(empty($offset))<br> {$offset=0;}<br> echo $offset;<br> $query=mysql_query("select * from jiaoshi order by id asc limit $offset,$list_num") or die ("fail");<br> mysql_query("set names 'GB2312'");<br> while($row=mysql_fetch_array($query)){<br> if(($n%2)!='0'){<br> echo "<tr bgcolor=#ffffff>";}<br> else{<br> echo "<tr bgcolor=#E4E4E4>";<br> }<br> if($row['surplus']==0)<br> $ss="不可选";<br> else $ss="可选"; <br> echo"<br> <td height='22' class='STYLE1'> <div align='center'>".$row['id']."</div></td><br> <td height='22' class='STYLE1'> <div align='center'>".$row['subject']."</div></td><div class="clear">
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