How to implement shopping cart in php

How to implement the shopping cart in php: 1. Lay out the front-end page; 2. Put the purchased item into a one-dimensional array; 3. Put all the one-dimensional arrays into a In a two-dimensional array; 4. Put the corresponding data into the session.

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

php realizes the shopping cart function

First lay out the front-end page layout as follows:

<?php
 $conn=mysql_connect("localhost","root","");
 mysql_select_db("shop",$conn);
 mysql_query("set names gb2312");
 $sql="select * from produce"; //查询所有商品
 $rs=mysql_query($sql,$conn); //执行sql语句，得到一个结果集
 while($row=mysql_fetch_array($rs)) //遍历结果集
{
?>
<table width="343" height="152" border="1" style="float:left">
  <tr>
    <td width="124" rowspan="3"><img  src="/static/imghw/default1.png"  data-src="images/<?php echo $row["  class="lazy"pimg"]? alt="How to implement shopping cart in php" >" width="123"    style="max-width:90%" border="0" /></td>
    <td width="203" height="35">货物名称：<?php echo $row["pname"] ?></td>
  </tr>
  <tr>
    <td height="28">货物价格：<?php echo $row["price"] ?></td>
  </tr>
  <tr>
    <td height="27" align="center"><a href="buy.php?id=<?php echo $row["pid"] ?>&pname=<?php
echo $row["pname"] ?>">购买</a></td>
  </tr>  
</table>
<?php
}
?>

View page effect:

We can Put the purchased item into a one-dimensional array, then put all the one-dimensional arrays into a two-dimensional array, and finally put the two-dimensional array into the session. No matter how you modify the purchased items in the future, you can take them out of the session and modify them.

<?php
session_start();//使用session之前一定要将session开启
ob_start();//要清空缓存就必须ob_start()
$pid=$_GET["id"];//得到购买物品的id
$name=$_GET["pname"];//得到购买物品的名字
$arr=$_SESSION["mycar"];//将session中的变量取出来
//下面先判断这个变量是否是数组,可以得到以前是否买过东西
if(is_array($arr)){
      //如果是数组，说明以前买过东西
      //如果买过东西又分两种情况：
      if(array_key_exists($pid,$arr)){
           //1、array_key_exists($pid,$arr)判断$arr中是否存在键值为$pid的一个一维数组，如果存在的话，就说明此商品以前购买过，只需要把数量加1
           $uu=$arr[$pid]; //从二维数组里拿出对应的一维数组，该一维数组包括id name num 三个值
           $uu["num"]=$uu["num"]+1;  //改变数量，将数量加1
           $arr[$pid]=$uu; //改完后再将此一维数组放回二维数组中
      }else{    
           //2.此商品第一次购买，就将得到的id和name值组成一个一维数组
           $arr[$pid]=array("pid"=>$pid,"name"=>$name,"num"=>1);
      }
}else{
      $arr[$pid]=array("pid"=>$pid,"name"=>$name,"num"=>1);
}
$_SESSION["mycar"]=$arr; //购买完后，将此数组重新放入session中，便可以在各个页面看到此session
ob_clean();//清空缓存
header("location:car.php");//跳转到购物车界面(car.php)
?>

Shopping cart code:

<?php
session_start();//启用session
$arr=$_SESSION["mycar"];//从session中拿出二维数组
?>
<form>
//下面将数组里的数据即客户所购买的物品展示出来
<table width="600" height="37" border="1">
  <tr>
    <td width="96">商品ID</td>
    <td width="158">商品名称</td>
    <td width="154">商品数量</td>
    <td width="177">删除</td>
  </tr>
<?php
//遍历这个二维数组
foreach($arr as $a){
?>
   <tr>
    <td width="96"><?php echo $a["pid"] ?></td>//物品的id
    <td width="158"><?php echo $a["name"] ?></td>//物品的名称
    <td width="154"><?php echo $a["num"] ?></td>//物品的数量
    <td width="177"><a href="delete.php?id=<?php echo $a[pid] ?>">删除</a></td>//点击删除超链接到”delete.php”，将物品的id传过去
   </tr>
<?php } ?>
</table>
</form>
<a href="index.php">返回继续购物</a>//返回到首页

Page effect:

When deleting a product, first get the id of the product to be deleted. After getting the id, take out the one-dimensional array corresponding to the obtained id in the two-dimensional array, clear the one-dimensional array (unset()), and then put the two-dimensional array back into session(),

<?php
session_start();//启动session
ob_start();//清空缓存必须启动的项
$pid=$_GET["id"];//得到通过get方式传过来的id
$arr=$_SESSION["mycar"];//拿出session里的二维数组
foreach($arr as $key=>$proId)//遍历该二维数组中的键值，这里也就是商品的id
{
      if($key==$pid)//判断键值等于传过来的商品id
      {
           unset($arr[$key]);//清除该一维数组
      }
}
$_SESSION["mycar"]=$arr;//将清除之后的二维数组重新放到session里
ob_clean();//清除缓存
header("location:car.php");//跳转到购物车
?>

The effect of deleting an item:

The function of the shopping cart is implemented as follows: purchase the product to get the id and name of the product, and add these two values The previous quantity (1) is put into a one-dimensional array. One product is a one-dimensional array, so it is natural to use a two-dimensional array for so many products. Before that, check whether the product has been purchased before. If so, add one to the previous quantity. Otherwise, re-create a one-dimensional array and put the one-dimensional array into a two-dimensional array. Finally put it into the session. When deleting, get the ID of the product to be deleted, then find the one-dimensional array that stores the product from the two-dimensional array, clear the one-dimensional array, and then put the two-dimensional array into the session. In this way, a simple shopping cart function similar to the one above is implemented.

This is just a simple implementation of the shopping cart function

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