首先写登陆页面，代码如下：
<body><h1>登入页面</h1><form action="dengrucl.php" method="post"> ???<div>帐号：<input type="text" name="zhang"/></div> ???<div>密码：<input type="text" name="mi"/></div> ???<input type="submit" value="登入"/></form></body>
处理页面代码：
<?phpsession_start();include ("../DBDA.class.php");$db = new DBDA();$zhang = $_POST["zhang"];$pwd= $_POST["pwd"];$sql = "select mi from yonghu WHERE zhang = ‘{$zhang}‘";$arr = $db->Query($sql);if(!empty($zhang)&&!empty($mi)&&$mi = $arr){ ???$_SESSION["zhang"] = $zhang; ???header("location:zym.php");}else{ ???echo "登入失败";}?>接下来是主页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> ???<head> ???????<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> ???????<title>无标题文档</title> ???????<script src="../bootstrap/js/jquery-1.11.2.min.js"></script> ???????<script src="../bootstrap/js/bootstrap.min.js"></script> ???????<link href="../bootstrap/css/bootstrap.min.css" /> ???</head> ???<body> ???????<h1>水果列表</h1> ???????<?php ???????session_start(); ????????> ???????<table width="50%" border="1" cellpadding="0" cellspacing="0"> ???????????<tr> ???????????????<td>代号</td> ???????????????<td>名称</td> ???????????????<td>单价</td> ???????????????<td>产地</td> ???????????????<td>库存</td> ???????????????<td>操作</td> ???????????</tr>
???????</table> ???</body></html>
处理代码： ???????????<?php ???????????require "../DBDA.class.php"; ???????????$db = new DBDA(); ???????????$sql = "select * from fruit"; ???????????$arr = $db -> query($sql); ???????????foreach ($arr as $v) { ???????????????echo "<tr> ???????????????<td>{$v[0]}</td> ???????????????<td>{$v[1]}</td> ???????????????<td>{$v[2]}</td> ???????????????<td>{$v[3]}</td> ???????????????<td>{$v[4]}</td> ???????????????<td><a href=‘gwc_chuli.php?ids={$v[0]}‘>加入购物车</a></td> ???????????????</tr>"; ???????????} ????????????>购物车
if(empty($_SESSION["gwc"])) { ????//如果是第一次添加购物车,造一个二维数组存到SESSION里面 ????$arr = array( ????????array($ids,1) ????); ?????????$_SESSION["gwc"] = $arr; } else { ????$arr = $_SESSION["gwc"]; ????$bs = false; //是否出现 ????foreach($arr as $v) ????{ ????????if($v[0]==$ids) ????????{ ????????????$bs = true; ????????} ????} ?????????if($bs) ????{ ??????//2.如果该商品在购物车存在，让数量加1 ????????foreach($arr as $k=>$v) ????????{ ????????????if($v[0] == $ids) ???????????{ ????????????????$arr[$k][1]++; ?//这里我们用一个变量K来取值和赋值，因为只是取到的值给了$v来代表数组的值,其实数组的值并不会因为$v改变二改变 ????????????} ????????} ????????$_SESSION["gwc"] = $arr; ???????????} ????else ????{ ???????//1.如果该商品购物车里面不存在，造一个一维数组扔到二维里面 ????????$attr = array($ids,1); ????????$arr[] = $attr; ????????$_SESSION["gwc"] = $arr; ????} } ?header("location:gwc_list.php");//回到列表的界面查看购物车
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> ???<head> ???????<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> ???????<title>无标题文档</title> ???????<script src="../bootstrap/js/jquery-1.11.2.min.js"></script> ???????<script src="../bootstrap/js/bootstrap.min.js"></script> ???????<link href="../bootstrap/css/bootstrap.min.css" /> ???</head> ???<body> ???????<h1>查看购物车</h1> ???????<table width="100%" border="1" cellpadding="0" cellspacing="0"> ???????????<tr> ???????????????<td>代号</td> ???????????????<td>名称</td> ???????????????<td>单价</td> ???????????????<td>数量</td> ???????????????<td>操作</td> ???????????</tr> ???????????<?php ???????????session_start(); ???????????$arr = $_SESSION["gwc"]; ???????????require "DataBase.class.php"; ???????????$db = new DateBase(); ???????????$sum = 0; ???????????foreach ($arr as $k => $v) { ???????????????$v[0]; ???????????????$v[1]; ???????????????$sql = "select * from fruit where ids=‘{$v[0]}‘"; ???????????????$af = $db -> query($sql); ???????????????echo "<tr> ???????????????<td>{$v[0]}</td> ???????????????<td>{$af[0][1]}</td> ???????????????<td>{$af[0][2]}</td> ???????????????<td>{$v[1]}</td> ???????????????<td><a href=‘gwc_del.php?sy={$k}‘>删除</a></td> ???????????????</tr>"; ???????????????$sum = $sum + $v[1] * $af[0][2]; ???????????} ????????></table><div><?php$gs = count($arr);//购物车里面有几个商品echo "该购物车里面总共有{$gs}种商品，商品的总价为：{$sum}元"; ????????????> ???????????</div> ???</body></html>删除物品
<?phpsession_start();$sy = $_GET["sy"];//如果该水果数量大于1,减1//如果该水果数量等于1 移除$arr = $_SESSION["gwc"];if ($arr[$sy][1] > 1) { ???//如果该水果数量大于1,减1 ???$arr[$sy][1]--;} else { ???unset($arr[$sy]); ???$arr = array_values($arr);}$_SESSION["gwc"] = $arr;header("location:gwc_chakan.php");PHP写购物车
原文地址：http://www.cnblogs.com/sglq/p/7526601.html