Question

我在购物车中添加总额时遇到了一些麻烦。我需要购物车能够添加物品总数，然后在订单中添加总计，然后最后单击“下订单”按钮，以便能够在购物车内订购所有物品。

目前我可以更改数量，但我必须选择产品ID，然后选择一个数量，而不是这个，在购物车中的每个项目附近应该有一个小盒子，我可以输入数量。

然后我需要在底部添加所有项目的总计，并且在点击购物车中的所有商品时，可以一次性订购“下订单”按钮。

目前我必须点击每个项目的下订单才能下订单，所以我必须前后退，这不是正确的做法。

请帮助我，我仍然是学习者。

提前致谢我会提供代码。

<?php
//Start session
session_start();

 $totalAll = 0;

//Include session details
require_once('auth.php');

//Include database connection details
require_once('connection/config.php');

//Connect to mysql server
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link) {
    die('Failed to connect to server: ' . mysql_error());
}

//Select database
$db = mysql_select_db(DB_DATABASE);
if(!$db) {
    die("Unable to select database");
}

//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
    $str = @trim($str);
    if(get_magic_quotes_gpc()) {
        $str = stripslashes($str);
    }
    return mysql_real_escape_string($str);
}

//checks if id is set in the url
if(isset($_GET['id'])){
    //retrive the first quantity from the quantities table
    $quantities=mysql_query("SELECT * FROM quantities")
    or die("Something is wrong ... \n" . mysql_error()); 
    $row=mysql_fetch_assoc($quantities);
    $quantity_value = $row['quantity_value'];

    //get id value
    $food_id = $_GET['id'];

    //retrive food_price from food_details based on $food_id
    $result=mysql_query("SELECT * FROM food_details WHERE food_id='$food_id'") or die("A problem has occured ... \n" . "Our team is working on it at the moment ... \n" . "Please check back after few hours.");
    $food_row=mysql_fetch_assoc($result);
    $food_price=$food_row['food_price'];

    //get member_id from session
    $member_id = $_SESSION['SESS_MEMBER_ID'];

    //define default values for quantity(got from $row), total($food_price*$quantity_value), and flag_0
    $quantity_id = $row['quantity_id'];
    $total = $food_price*$quantity_value;
    $flag_0 = 0;


    //Create INSERT query
    $qry = "INSERT INTO cart_details(member_id, food_id, quantity_id, total, flag) VALUES('$member_id','$food_id','$quantity_id','$total','$flag_0')";
    $result = @mysql_query($qry);

    //Check whether the query was successful or not
    if($result) {
        header("location: cart.php");
        exit();
    }else {
        die("A problem has occured with the system " . mysql_error());
    }
}
 ?>

Answer 1

您的代码目前只能从网址获取一个ID，但为了计算整个购物车的总数，您需要购物车中的所有ID。通常他们会被保存到$ _SESSION。您可以使用以下代码查看会话内部：var_dump（$ _ SESSION）;也可能将ID保存到数据库中某种类型的购物车表。在您的代码中，我不明白为什么您只是从数量表中获取第一个项目。我很确定桌子以某种方式连接到食物桌上（我想通过food_id）。

如果您从会话中获取了ID，那么您的代码看起来应该是这样的（因为sql语句而不是testet）：

<?php 
$member_id = $_SESSION['SESS_MEMBER_ID']; //get member_id from session before the loop

$food_ids = array($id1, $id2, $id3); //you need all $food_id added to cart instead of just 1 from url, usally saved to $_SESSION

$grandTotal = 0;
foreach ($food_ids as $food_id) { //LOOP THROUGH IDs
    //retrive quantity of food in cart from the quantities table
    $quantities=mysql_query("SELECT * FROM quantities WHERE food_id='$food_id'") //there must be a connection between quantities and food so I added food_id="xxx"
    or die("Something is wrong ... \n" . mysql_error()); 
    $row=mysql_fetch_assoc($quantities);
    $quantity_value = $row['quantity_value'];

    //retrive food_price from food_details based on $food_id
    $result=mysql_query("SELECT * FROM food_details WHERE food_id='$food_id'") 
    or die("A problem has occured ... \n" . "Our team is working on it at the moment ... \n" . "Please check back after few hours.");
    $food_row=mysql_fetch_assoc($result);
    $food_price=$food_row['food_price'];


    //define default values for quantity(got from $row), total($food_price*$quantity_value), and flag_0
    $quantity_id = $row['quantity_id'];
    $total = $food_price*$quantity_value;
    $grandTotal = $grandTotal + $total; //add total of this product to the $grandTotal from last time inside this loop
    $flag_0 = 0;


    //Create INSERT query
    $qry = "INSERT INTO cart_details(member_id, food_id, quantity_id, total, flag) VALUES('$member_id','$food_id','$quantity_id','$total','$flag_0')";
    $result = @mysql_query($qry);

    //Check whether the query was successful or not
    if($result) {
        header("location: cart.php");
        exit();
    }else {
        die("A problem has occured with the system " . mysql_error());
    }
} /*Now you have $grandTotal calculated*/?>

如何通过一次点击在购物车中添加总数并在购物车中下订单？

1 个答案: