请问php4.30怎么访问通过联接传过来的变量？

Question

echo $_GET['isbn_id'];
http://expert.csdn.net/Expert/TopicView1.asp?id=1312288

Answer 1

以后就要用$_COOKIE[],$_SESSION[],$_POST[],$_GET[]了

Answer 2

还是不行呀，这是我的实际应用的文件！
index.php
<?
 <tr>
 <td width="346" height="25">&nbsp;书&nbsp;&nbsp;&nbsp; 名：<b><a href="viewbook.php?isbn_id=<?=$isbn_id?>"><?=$db->get('bookname')?></b></a></td>
 </tr>
......
?><?
include ("include/global.php");
include ("include/config.php");
include ("include/functions.php");
head();
template();
navigation("在线借阅系统","查看书的详细信息"); 
echo $_GET['isbn_id'];//不显示呀
$sql = "select * from book_info where isbn_id='".$_GET['isbn_id']."'";
$db->query($sql);
$db->records();
?>
......