Backend DevelopmentPHP TutorialExample 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 id="登录">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 id="大苹果购物网">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"] = $arr;
}
}
header("location:gouwuche.php");Then the main shopping cart interface is as follows
<h2 id="购物车中有以下商品">购物车中有以下商品：</h2>
<table cellpadding="0" cellspacing="0" border="1" width="100%">
<tr>
<td>商品名称</td>
<td>商品单价</td>
<td>购买数量</td>
<td></td>
</tr>
<?php
session_start();
//$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>删除</a>
</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!
The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AMWhat’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.
PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AMPHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.
PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AMPHP 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: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AMPHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.
Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AMPHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AMPHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.
PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AMPHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AMPHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.
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
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
WebStorm Mac version
Useful JavaScript development tools
Atom editor mac version download
The most popular open source editor
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
