Backend Development
PHP Tutorial
Example explanation of how to implement shopping cart function in PHP
Example explanation of how to implement shopping cart function in PHP
The first is a few simple login pages
<body>
<form action="chuli.php" method="post">
<p style="margin-left: 500px; margin-top: 200px;
height: 250px; width: 250px; border: 1px dashed black">
<p style="margin-left: 100px; "><h3>登录</h3></p>
<p style="margin-top: 20px">用户名：<input type="text" name="uid"/></p><br/>
<p>密 码：<input type="password" name="pwd"/></p><br/>
<p style="margin-left: 180px"><input type="submit" value="登录"/></p>
</p>
</form>
</body>After the login page is written, you need to enter the processing page and retrieve the user name and password from the database:
<?php
session_start(); //开启session 必须要写到第一行
header("Content-type:text/html;charset=utf-8");
$uid=$_POST["uid"]; //从登录页面获取到用户名和密码
$pwd=$_POST["pwd"];
include("DADB.class.php");
$db=new DADB();
$sql="select password from login where username='{$uid}'";
$arr=$db->Query($sql);
if($arr[0][0]==$pwd && !empty($pwd)) //判断所填写的密码和取到的密码是一样的，而且密码不能为空
{
$_SESSION["uid"]=$uid;
header("location:main.php");
}
else
{
echo"登录失败";
} This shows the login Page 
Now we are going to the main page. We will retrieve all the fruit information from the database, and then we will implement the function of adding to the shopping cart.
<h2>大苹果购物网</h2>
<?php
session_start();
include("DADB.class.php");
$db=new DADB();
?>
<table border="1" width="100%" cellpadding="0" cellspacing="0">
<tr>
<td>代号</td>
<td>水果名称</td>
<td>水果价格</td>
<td>原产地</td>
<td>货架</td>
<td>库存量</td>
<td></td>
</tr>
<?php
$uid=$_SESSION["uid"];
$sql="select * from fruit";
$arr=$db->Query($sql);
foreach($arr as $v)
{
echo"<tr>
<td>{$v[0]}</td> // 从数据库调出我们所需要的内容
<td>{$v[1]}</td>
<td>{$v[2]}</td>
<td>{$v[3]}</td>
<td>{$v[4]}</td>
<td>{$v[5]}</td>
<td><a href='add.php?ids={$v[0]}'>购买</a></td> //这里的购买相当于添加购物车的功能
</tr>";
}
?>
<?php
//这里显示的是 购物车有多少产品，和产品的总价格
$ann=array();
if(!empty($_SESSION["gwc"]))
{
$ann=$_SESSION["gwc"];
}
$zhonglei = count($ann);
$sum=0;
foreach($ann as $k)
{
$sql1="select price from fruit where ids='{$v[0]}'";
$danjia=$db->Query($sql1);
foreach($danjia as $n)
{
$sum=$sum + $n[0]*$k[1];
}
}
echo"购物车有<mark>{$zhonglei}</mark>种商品，总价格为<mark>{$sum}</mark>元";
?>
</table>
<p>
<a href="gouwuche.php">查看购物车</a>
<a href="main.php">浏览商品</a>
<a href="zhanghu.php">查看账户</a> </p>
</body> Main page display picture 
The next step is to add the shopping cart page
<?php
session_start();
$ids = $_GET["ids"];
if(empty($_SESSION["gwc"]))
{
//1.购物车是空的，第一次点击添加购物车
$arr = array(
array($ids,1)
);
$_SESSION["gwc"]=$arr;
}
else
{
//不是第一次点击
//判断购物车中是否存在该商品
$arr = $_SESSION["gwc"]; //先存一下
$chuxian = false;
foreach($arr as $v)
{
if($v[0]==$ids)
{
$chuxian = true;
}
}
if($chuxian)
{
//3.如果购物车中有该商品
for($i=0;$i<count($arr);$i++)
{
if($arr[$i][0]==$ids)
{
$arr[$i][1]+=1;
}
}
$_SESSION["gwc"] = $arr;
}
else
{
//2.如果购物车中没有该商品
$asg = array($ids,1);
$arr[] = $asg;
$_SESSION["gwc"] = $arr;
}
}
header("location:gouwuche.php");Then the main shopping cart interface is as follows
<h2>购物车中有以下商品：</h2>
<table cellpadding="0" cellspacing="0" border="1" width="100%">
<tr>
<td>商品名称</td>
<td>商品单价</td>
<td>购买数量</td>
<td></td>
</tr>
<?php
session_start();
//$uid=$_SESSION["uid"];
$arr=array();
if(!empty($_SESSION["gwc"]))
{
$arr=$_SESSION["gwc"];
}
include("DADB.class.php");
$db=new DADB();
foreach($arr as $v)
{
global $db;
$sql="select * from fruit where ids='{$v[0]}'";
$att=$db -> Query($sql,1);
foreach($att as $n)
{
echo"<tr>
<td>{$n[1]}</td>
<td>{$n[2]}</td>
<td>{$v[1]}</td>
<td><a href='shanchu.php?sy={$k}'>删除</a></td></tr>";} } ?> </table> <p> <a href="gouwuche.php">查看购物车</a> <a href="main.php">浏览商品</a> <a href="zhanghu.php">查看账户</a> </p> 14 15 </body>
Then we will When we get to the deletion page, we need to process when there is only one item in the shopping cart or when there is more than one item.
<?php
session_start();
$sy = $_GET["sy"];
//根据索引找到该数据
$arr = $_SESSION["gwc"];
$arr[$sy]; //要删除的数据
//如果数量不为1，数量减1
if($arr[$sy][1]>1)
{
$arr[$sy][1] = $arr[$sy][1]-1;
}
else //如果数量为1，移除
{
unset($arr[$sy]);
}
$_SESSION["gwc"] = $arr; //最后存一下购物车的内容
header("location:gouwuche.php");As for the submission page, we have to think about balance, inventory and other factors, so it is more cumbersome,
No I'm afraid, code it.
<?php
session_start();
header("Content-type:text/html;charset=utf-8"); //防止出现乱码
$uid=$_SESSION["uid"];
//先查一下账户余额
include("DADB.class.php");
$db=new DADB();
$ysql="select account from login where username='{$uid}'";
$yarr=$db->Query($ysql);
$yarr[0][0];//总额
//购物车的总价格，前面有写过
$arr=array();
if (!empty($_SESSION["gwc"]))
{
$arr=$_SESSION["gwc"];
}
$sum=0;
foreach($arr as $v)
{
$v[1];//购物车中产品的数量
$psql="select price from fruit WHERE ids='{$v[0]}'";
$parr=$db->Query($psql);
foreach($parr as $k)
{
$k[0];//产品的单价
$sum+=$k[0]*$v[1];
}
}
//判断余额是否满足购买
if($yarr[0][0]>=$sum)
{//余额满足，要判断库存
foreach($arr as $v)
{
$ksql="select number from fruit where ids='{$v[0]}'";
$karr=$db->Query($ksql);
$karr[0][0];//这是库存
if($karr[0][0]<$v[1]) //表示库存不足，这时要给顾客提示库存不足
{
echo"库存不足";
exit;
}
}
//判断之后需要提交订单了
//账户扣除余额
$kcsql="update login set account=account-{$sum} where username='{$uid}'";
$db->Query($kcsql,0);//这里是修改语句，所以要加上0
//扣除库存
foreach($arr as $v)
{
$kcksql="update fruit set number=number-$v[1] where ids='{$v[0]}'";
$db->Query($kcksql,0);
}
//所有的工作都做完了，这时我们就该提交订单了
// 这里我在数据库中做了两张表，把提交的订单添加到表中就可以保存了
//添加订单
$ddh = date("YmdHis");
$time = date("Y-m-d H:i:s");
$sdd = "insert into orders values('{$ddh}','{$uid}','{$time}')";
$db->Query($sdd,0);
//添加订单详情
foreach($arr as $v)
{
$sddxq = "insert into orderdetails values('','{$ddh}','{$v[0]}','{$v[1]}')";
$db->Query($sddxq,0);
}
}
else
{
echo "余额不足";
exit;
}
?> 
The above is the detailed content of Example explanation of how to implement shopping cart function in PHP. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1667
14
1426
52
1328
25
1273
29
1255
24
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
