Question

我使用PHP制作了一个订单，为每个订购的商品制作小计。如何创建一个函数/代码来显示页面底部的订单总数。我试着在PHP.net上阅读，但无法弄明白。

以下是我的代码示例：

$bread = $_POST["bread"];
$cheese = $_POST["cheese"];
$eggs = $_POST["eggs"];

$priceBread = 5;
$priceCheese = 5;
$priceEggs = 3.6;

function subtotal($incomingQuantity, $incomingPrice){
  return $incomingQuantity * $incomingPrice;
}

<div id="breadSubtotal">$<?php echo subtotal($bread, $priceBread); ?>
<div id="cheeseSubtotal">$<?php echo subtotal($cheese, $priceCheese); ?></div>
<div id="eggsSubtotal">$<?php echo subtotal($eggs, $priceEggs); ?></div>

我希望所有项目的小计中的总数

Answer 1

这样的事情？

$total = 0;

function subtotal($incomingQuantity, $incomingPrice){
  global $total;
  $sub = $incomingQuantity * $incomingPrice;
  $total += $sub;
  return $sub;
}

然后在HTML

中

<div id="total">$<?php echo $total; ?></div>

另外，不要忘记使用类似

之类的东西来保护你收到的$ _POST变量

$bread = htmlspecialchars($_POST["bread"]);

Answer 2

我希望所有项目的小计中的总数

计算起来非常简单。试试这个

$bread = 2;
$cheese = 3;
$eggs = 4;

$priceBread = 5;
$priceCheese = 5;
$priceEggs = 3.6;
$total = 0;
function subtotal($incomingQuantity, $incomingPrice){
  return $incomingQuantity * $incomingPrice;
}

$total += subtotal($bread, $priceBread) ;
$total += subtotal($bread, $priceBread);
$total += subtotal($cheese, $priceCheese);
echo "order total : " + $total;

Answer 3

如果没有错，您想要计算每件商品的数量和商品的价格。基于这一点，我就是这样做的。

public function getTotal()
{
    $total = 0;
    $subTotal = func_get_args();
    for($a = 0; $a < sizeof($subTotal); $a++)
    {
        $total += $subTotal[$a];
    }

    return $total;
 }

测试功能

getTotal(subtotal($bread, $priceBread), subtotal($cheese, $priceCheese), subtotal($eggs, $priceEggs));

Answer 4

我就是这样做的，给你更多的灵活性

<?php
$bread = $_POST["bread"];
$cheese = $_POST["cheese"];
$eggs = $_POST["eggs"];

//prices
$prices = array('bread'=>5,'cheese'=>5,'eggs'=>3.6);

function calculateOrderTotals($items, $prices){

    //result
    $result = array('total'=>0, 'subTotal'=>array());

    //total
    $total = 0;

    //calculate subtotal and total
    foreach ($items as $item => $nPurchased){
        $subTotal = $nPurchased* $prices[$item];
        $result['subTotal'][$item] = $subTotal; 
        $total += $subTotal;
    }

    //set total
    $result['total'] = $total;

    //return
    return $result;
}

//call function to calculate    
$totals = calculateOrderTotals(array('bread'=>$bread,'cheese'=>$cheese,'eggs'=>$eggs), $prices);

?>

<div id="breadSubtotal"><?php echo $totals['subTotal']['bread'];?>
<div id="cheeseSubtotal"><?php echo $totals['subTotal']['cheese']; ?></div>
<div id="eggsSubtotal"><?php echo $totals['subTotal']['eggs']; ?></div>
<div id="total"><?php echo $totals['total']; ?></div>

PHP订单提交总计算

4 个答案: