PHP implements the function of adding products to the shopping cart (1)

PHP implements the function of adding products to the shopping cart (1)_php example

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Release： 2023-03-23 10:50:01

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This article mainly introduces the function of adding products to the shopping cart in PHP in detail. It has a certain reference value. Interested friends can refer to it.

Today I am practicing the shopping cart and submitting orders. I’m a little dizzy writing this, so let’s organize it by the way. This shopping cart is relatively simple. It is used for short-term storage and is not stored in the database. The shopping cart is simply familiar to people who love online shopping. I am writing this. Before entering the shopping cart, we must first conceive. We need to call up a table from the database. Here I use the fruit table, followed by the login table. I use the login table to adjust the user name and password. After everything is ready, there are three situations when you should consider putting it in the shopping cart:

The first situation: There is nothing in the shopping cart

Second case: There is already this product in the shopping cart. When adding it again, the quantity to be considered is 1

Third case: Shopping There is a product in the car, but there is no such product

The following picture is the database table used:

The following is the code for the login page:

<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>

Copy after login

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();

$sql="select password from login where username=&#39;{$uid}&#39;";
$arr=$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";
}

Copy after login

The login page is as shown in the figure:

Now we are going to enter the main page, and pull out all the fruit information from the database, and then we Next, 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>{$v[5]}</td>
  <td><a href=&#39;add.php?ids={$v[0]}&#39;>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)
 {
  $sql1="select price from fruit where ids=&#39;{$v[0]}&#39;";

  $danjia=$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" rel="external nofollow" rel="external nofollow" >查看购物车</a>
<a href="main.php" rel="external nofollow" rel="external nofollow" >浏览商品</a>
<a href="zhanghu.php" rel="external nofollow" rel="external nofollow" >查看账户</a> </p>

</body>

Copy after login

The main page is as shown in the picture:

The most important thing is the add 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");

Copy after login

This will display the shopping cart page. The shopping cart page code 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;
  $sql="select * from fruit where ids=&#39;{$v[0]}&#39;";
  $att=$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=&#39;shanchu.php?ids={$v[0]}&#39;>删除</a></td>
 </tr>";}

 }
 ?>

</table>
<p>
<a href="gouwuche.php" rel="external nofollow" rel="external nofollow" >查看购物车</a> 
<a href="main.php" rel="external nofollow" rel="external nofollow" >浏览商品</a> 
<a href="zhanghu.php" rel="external nofollow" rel="external nofollow" >查看账户</a> </p> 14 15 </body>

Copy after login

Enter the shopping cart page like this, as shown in the picture:

This is just a relatively simple way to add to the shopping cart, but there are still many links in the middle that are not perfect. , for example, after adding to the shopping cart, the number of products in the database is reduced, and operations such as deleting products in the shopping cart have not yet been performed. These operations will be completed later.

Related recommendations:

Detailed tutorial on making a shopping cart with Ajax PHP

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