Question

我正在尝试创建一个购物车。我试图得到的总数输出，但返回为0输出应该是价格*数量，但结果是0，这些是我已经尝试过的东西。我正在尝试创建一个购物车。我试图得到的总数输出，但返回为0，输出应该是价格*数量，但结果是0，这些是我已经尝试过的东西。

    <?php

include 'config.php';

{
    if (isset($_POST["cart"])){

        $field0 = $_POST["field0"];
        $field1 = $_POST["field1"];
        //$field2 = $_POST["field2"];
        $field3 = $_POST["field3"];
        $field4 = $_POST["field4"];
        $field5 = $_POST["field5"];
        $or_qty = $_POST["or_qty"];
        $price = $_POST["price"];

    if (empty($field0)||empty($field1)||empty($field3)||empty($field4)||empty($field5)){
        //echo '<script>alert("Please Complete all the data")</script>';
    }else{
        $insert = mysqli_query($conn, "INSERT INTO `template` (`field0`,`field1`,`field3`,`field4`,`field5`,`or_qty`) VALUES ('$field0','$field1','$field3','$field4','$field5','$or_qty')");
        //echo '<script>alert("Order is added to cart")</script>';
    }
}
?>

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Cart</title>
</head>

<body>
    <?php
    $total = 0;
if ($field0 == 1){
    $total = $total + ($or_qty);
}
    elseif($field0 == 2){
        $total = $total + ($or_qty*$price);
    }
    elseif($field0 == 3){
        $total = $total + ($or_qty*$price);
    }
    elseif($field0 == 4){
        $total = $total + ($or_qty*$price);
    }
    echo number_format($total);
        $insert = mysqli_query($conn, "INSERT INTO `product_order` (`total`,`or_Qty`,`price`) VALUES ('$total','$or_qty','$price')");
    ?>
    <!--$total = $total + ($values["item_quantity"] * $values["item_price"]);-->

    <?php } ?>
</body>
</html>

Answer 1

通过给$ _POST [“ cart”]一个值并手动设置$ field0，$ or_qty和$ price，我能够使$ total等于0以外的值。如果我删除$ _POST [“ cart”] = 3 ;，则总数始终为0。

我还添加了一些逻辑以确保只有在设置了$ _POST [“ cart”]并稍微清理代码的情况下才显示总数。

我认为您的问题是未设置$ _POST [“ cart”]，因此也从未设置其余变量。

通常$ _POST值是通过表单或其他网页设置的。

Finally, you should consider using prepared statements to prevent mysql injections.


<?php
include 'config.php';
$_POST["cart"]=3;
    if (isset($_POST["cart"])){

        $field0 = 3;
        $field1 = $_POST["field1"];
        //$field2 = $_POST["field2"];
        $field3 = $_POST["field3"];
        $field4 = $_POST["field4"];
        $field5 = $_POST["field5"];
        $or_qty = 4;
        $price = 0.50;

    if (empty($field0)||empty($field1)||empty($field3)||empty($field4)||empty($field5)){
        //echo '<script>alert("Please Complete all the data")</script>';
    }else{
        $insert = mysqli_query($conn, "INSERT INTO `template` (`field0`,`field1`,`field3`,`field4`,`field5`,`or_qty`) VALUES ('$field0','$field1','$field3','$field4','$field5','$or_qty')");
        //echo '<script>alert("Order is added to cart")</script>';
    }
}
?>

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Cart</title>
</head>

<body>
    <?php
    if (isset($_POST["cart"])){
        $total = 0;
        if ($field0 == 1){
            $total = $total + ($or_qty);
        }
        elseif($field0 == 2){
            $total = $total + ($or_qty*$price);
        }
        elseif($field0 == 3){
            $total = $total + ($or_qty*$price);
        }
        elseif($field0 == 4){
            $total = $total + ($or_qty*$price);
        }
        echo number_format($total);
        $insert = mysqli_query($conn, "INSERT INTO `product_order` (`total`,`or_Qty`,`price`) VALUES ('$total','$or_qty','$price')");
    }
    ?>
    <!--$total = $total + ($values["item_quantity"] * $values["item_price"]);-->
</body>
</html>

显示总计为0

1 个答案: