购物车练习

<!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="../jquery-1.11.2.min.js"></script>
<style type="text/css">
#tou{ font-family:"微软雅黑"; font-size:36px; margin-top:20px; margin-left:600px}
#main{ 100%; background-color:#6CC}
#right{ 60%;background-color:#F93; float:left;}
#left{ 20%; font-family:"微软雅黑"; font-size:18px; float:left; margin-left:100px}
#dd{ font-family:"微软雅黑"; font-size:18px; margin-left:1000px;}
</style>
</head>

<body>
<?php
session_start();
if(empty($_SESSION["uid"]))
{
	header("location:login.php");	
	exit;
}
include("../DBDA.class.php");
$db=new DBDA();
$sql="select * from fruit";
$attr=$db->Query($sql);
$gouwuche=array();
if(!empty($_SESSION["gwc"]))
{
	$gouwuche=$_SESSION["gwc"];
}
$shuliang=count($gouwuche);//商品数量
//总价
$zongjia=0;
foreach($gouwuche as $v)
{
	$sprice="select Price from fruit where Ids='{$v[0]}'";
	$price=$db->StrQuery($sprice);
	$zongjia=$zongjia+$price*$v[1];	
}
?>
<div id="tou">购物网</div>
<div id="dd"><a href="login.php">登录</a></div>
<div id="main">
	<div id="left">
    	<div><a href="index.php">浏览商品</a></div>
    	<div><a href="gouwuche.php">查看购物车</a></div>
        <div><a href="zhanghu.php">查看账户</a></div>
    </div>
    <div id="right">
    <div>
    购物车中有<?php echo $shuliang ?>件商品，总价<?php echo $zongjia ?>元
    </div>
    <table width="100%" border="1" cellpadding="0" cellspacing="0" id="zhuti">
	<tr>
    	<td>代号</td>
        <td>水果名称</td>
        <td>价格</td>
        <td>产地</td>
        <td>库存</td>
        <td></td>
    </tr>
<?php
foreach($attr 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='dingdanchuli.php?code={$v[0]}'>购买</a></td>
    </tr>";
}
?>
	</table>
	</div>
</div>
</body>
</html>

　　

<!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>
<style type="text/css">
*{ margin:0px auto}
#tou{ font-family:"微软雅黑"; font-size:36px; margin-top:20px; margin-left:600px}
#dd{ margin-left:530px; margin-top:50px}
#mima{ margin-top:10px}
#ddd{ margin-left:120px; margin-top:10px}
</style>
</head>

<body>
<div id="tou">登录页面</div>
<div id="dd">
<form action="loginchuli.php" method="post">
<div>用户名：<input type="text" name="uid" /></div>
<div id="mima">密码： <input type="password" name="pwd" /></div>
<div id="ddd"><input type="submit" value="登录" /></div>
</form>
</div>
</body>
</html>

　　

<?php
session_start();
include("../DBDA.class.php");
$db=new DBDA();
$uid=$_POST["uid"];
$pwd=$_POST["pwd"];
$sql="select PassWord from login where UserName='{$uid}'";
$mima=$db->StrQuery($sql);
if($pwd==$mima && $pwd !="")
{
	$_SESSION["uid"]=$uid;
	header("location:index.php");	
}
else
{
	echo "用户名或密码错误";
}

　　

<!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="../jquery-1.11.2.min.js"></script>
<style type="text/css">
#tou{ font-family:"微软雅黑"; font-size:36px; margin-top:20px; margin-left:600px}
#main{ 100%; background-color:#6CC}
#right{ 60%;background-color:#F93; float:left;}
#left{ 20%; font-family:"微软雅黑"; font-size:18px; float:left; margin-left:100px}
#dd{ font-family:"微软雅黑"; font-size:18px; margin-left:1000px;}
</style>
</head>

<body>
<?php
session_start();
if(empty($_SESSION["uid"]))
{
	header("location:login.php");	
	exit;
}
include("../DBDA.class.php");
$db=new DBDA();
$attr=array();
if(!empty($_SESSION["gwc"]))
{
		$attr=$_SESSION["gwc"];
}
?>
<div id="tou">购物车</div>
<div id="dd"><a href="login.php">登录</a></div>
<div id="main">
	<div id="left">
    	<div><a href="index.php">浏览商品</a></div>
    	<div><a href="gouwuche.php">查看购物车</a></div>
        <div><a href="zhanghu.php">查看账户</a></div>
    </div>
    <div id="right">
    <table width="100%" border="1" cellpadding="0" cellspacing="0" id="zhuti">
	<tr>
        <td>水果名称</td>
        <td>单价</td>
        <td>数量</td>
        <td></td>
    </tr>
<?php
foreach($attr as $v)
{
	$smcdj="select * from fruit where Ids='{$v[0]}'";
	$sginfo=$db->Query($smcdj);
	echo "<tr>
        <td>{$sginfo[0][1]}</td>
        <td>{$sginfo[0][2]}</td>
        <td>{$v[1]}</td>
        <td><a href='delete.php?code={$v[0]}'>删除</a></td>
    </tr>";
}
?>
	</table>
    	<div>
        <a id="tj" href="tijiao.php">提交订单</a> <span id="xinxi"></span>
        </div>
	</div>
</div>
</body>
<script type="text/javascript">
$(document).ready(function(e) {
    $("#tj").click(function(){
			var bs=false;
			 $.ajax({
				 async:false,
				 url:"check.php",
				 dataType:"TEXT",
				 success: function(data){
					 	if(data.trim()=="ok")
						{
							bs=true;
						}
						else
						{
							$("#xinxi").html(data);
							$("#xinxi").css("color","#F00");	
						}
					 }
				 });
			return bs;
		})
});
</script>
</html>

　　

<?php
session_start();
include("../DBDA.class.php");
$db=new DBDA();
//取出购物车信息
$attr=$_SESSION["gwc"];
//取出登录者用户名
$uid=$_SESSION["uid"];
//总价
$zongjia=0;
foreach($attr as $v)
{
	$sprice="select Price from fruit where Ids='{$v[0]}'";
	$price=$db->StrQuery($sprice);
	$zongjia=$zongjia+$price*$v[1];	
}
//余额
$sql="select Account from login where UserName='{$uid}'";
$yue=$db->StrQuery($sql);
if($yue>=$zongjia)
{
	//判断库存
	$daihao="";
	foreach($attr as $v)
	{
		//取库存
		$skucun="select Numbers from fruit where Ids='{$v[0]}'";
		$kucun=$db->StrQuery($skucun);	
		//如果库存小于数量
		if($kucun<$v[1])
		{
			$daihao=$v[0];
			break;	
		}
	}
	if($daihao=="")
	{
		echo "ok";	
	}	
	else
	{
		$sname="select Name from fruit where Ids='{$daihao}'";
		$name=$db->StrQuery($sname);
		echo "{$name}库存不足";
	}
}
else
{
	echo "余额不足";	
}

　　

<?php
session_start();
//$_SESSION["gwc"];
$code=$_GET["code"];
/*$attr=array(
	array("f001",1)
);*/
//第一次点击购买
if(empty($_SESSION["gwc"]))
{
	/*$attr=array();//造二维数组外层数组
	$anei=array();//造二维数组里层数组
	$anei[]=$code;
	$anei=1;
	$attr[]=$anei;*/
	$attr=array(
		array($code,1)
	);	
	$_SESSION["gwc"]=$attr;
}
else
{
	//已经点击过购买
	$attr=$_SESSION["gwc"];	
	//判断该水果是否购买过
	$count=0;
	foreach($attr as $v)
	{
		if($v[0]==$code)
		{
			$count++;
		}	
	}
	//该水果在购物车中存在
	if($count>0)
	{
		foreach($attr as $k=>$v)
		{
			if($v[0]==$code)
			{
				$attr[$k][1]=$v[1]+1;
			}	
		}	
	}
	else
	{
		//该水果在购物车没有出现过
		$anei=array($code,1);
		$attr[]=$anei;	
	}
	//将修改的数组添加到session里
	$_SESSION["gwc"]=$attr;
	
}
header("location:index.php");

　　

<!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="../jquery-1.11.2.min.js"></script>
<style type="text/css">
#tou{ font-family:"微软雅黑"; font-size:36px; margin-top:20px; margin-left:600px}
#main{ 100%; background-color:#6CC}
#right{ 60%;background-color:#F93; float:left;}
#left{ 20%; font-family:"微软雅黑"; font-size:18px; float:left; margin-left:100px}
#dd{ font-family:"微软雅黑"; font-size:18px; margin-left:1000px;}
</style>
</head>

<body>
<?php
session_start();
if(empty($_SESSION["uid"]))
{
	header("location:login.php");	
	exit;
}
include("../DBDA.class.php");
$db=new DBDA();
$uid=$_SESSION["uid"];
$sql="select Account from login where UserName='{$uid}'";
$yue=$db->StrQuery($sql);
?>
<div id="tou">购物车</div>
<div id="dd"><a href="login.php">登录</a></div>
<div id="main">
	<div id="left">
    	<div><a href="index.php">浏览商品</a></div>
    	<div><a href="gouwuche.php">查看购物车</a></div>
        <div><a href="zhanghu.php">查看账户</a></div>
    </div>
    <div id="right">
    您的账户余额为<?php echo $yue ?>元
    </div>

	</table>
	</div>
</div>
</body>
</script>
</html>

　　

<?php
session_start();
include("../DBDA.class.php");
$db=new DBDA();
//购物车信息
$attr=$_SESSION["gwc"];
//取登陆者用户名
$uid=$_SESSION["uid"];
//总价
$zongjia = 0;
foreach($attr as $v)
{
	$sprice = "select price from fruit where ids='{$v[0]}'";
	$price = $db->StrQuery($sprice);
	$zongjia = $zongjia + $price*$v[1];
}
//1.减余额
$sjian="update login set Account=Account-{$zongjia} where UserName='{$uid}'";
$db->Query($sjian,0);
//2.减库存
foreach($attr as $v)
{
	$skjian="update fruit set Numbers=Numbers-{$v[1]} where Ids='{$v[0]}'";	
	$db->Query($skjian,0);
}
//3.添加订单信息
$ordercode=date("YmdHis");
$time=date("Y-m-d H:i:s");
$sdingdan="insert into orders values('{$ordercode}','{$uid}','{$time}')";
$db->Query($sdingdan,0);
//添加订单详情
foreach($attr as $v)
{
	$sxiangqing="insert into orderdetails values('','{$ordercode}','{$v[0]}','{$v[1]}')";
	$db->Query($sxiangqing,0);	
}
header("location:index.php");

　　

<?php
session_start();
$attr=$_SESSION["gwc"];
$code=$_GET["code"];
foreach($attr as $k=>$v)
{
	if($v[0]==$code)
	{
		//判断数量是否大于一
		if($v[1]>1)
		{
			$attr[$k][1]=$attr[$k][1]-1;	
		}
		else
		{
			unset($attr[$k]);	//unset删除
		}	
	}	
}
$_SESSION["gwc"]=$attr;
header("location:gouwuche.php");

　　

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原文地址：https://www.cnblogs.com/hamilton/p/5631201.html