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1.Èç¹ûûÓеǼµÄʱºòÑ¡Ôñ¹ºÂò£¬ÄǸöÌáʾ¡¾ÇëÏȵǼ¡¿»á³öÀ´£¬µ«ÊǺóÃæÍøÒ³»áÏÔʾUndefined index:admin in.....line 8£¬¾ÍÊÇif(!isset($_SESSION['admin']))ÄǸö
2.²»¹ÜÎÒ¹ºÂò¶àÉÙÖÖÊ飬ÄǸö¼Ç¼ÊéÖÖÀàµÄ±äÁ¿$_SESSION['itemNum']×ÜÊÇΪ1
3.ÎÒÔÚ¹ºÎï³µÒ³ÃæÏÔʾ¹ºÎïÐÅϢʱ£¬×ܼ۸ñÏÔʾµÄÊǵ¥¼Û£¬Ã»ÓÐ³ËÆðÀ´¡£¡£¡£¡£¡£¡£
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PHP code:

<?php
include ("include/setting.inc.php");
include ("include/conn.php");
//var $_SESSION['admin'];
session_start();
mysql_query("SET NAMES 'UTF8'");

if(!isset($_SESSION['admin'])&&$_SESSION['admin']==false){
echo '<SCRIPT LANGUAGE="javascript">';
echo "alert('ÇëÏȵǼ');";
echo "location.href='login.php'";
echo '</SCRIPT>';
}
else{
$_SESSION['file']=""; //Õâ¸öÊÇÓÃÀ´¼Ç¼µ±Ç°Â·¾¶£¬µÈµÇ¼ºó·µ»Ø
}

$_SESSION['itemNum']; //¼Ç¼×ܹ²Óм¸ÖÖÊé
$bookid=$_GET['id'];
$str="select * from books where b_id=".$bookid;
$result=mysql_query($str);
$row=mysql_fetch_array($result);

if(isset($_SESSION['$bookid']['id'])){ //ÅжϹºÎï³µÊÇ·ñÓÐÕâ¸öÊ飬ÓеϰÊýÁ¿¼Ó1
$_SESSION['$bookid']['booknum']++;
}
else{
$_SESSION['$bookid']['id']=$row['b_i


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