Question

我试图从存储在从mysql数据库返回的数组中的一系列值中计算小计和总数。

这就是我所拥有的如此

    while($row = mysql_fetch_array($cart)){ 
    foreach($row AS $key => $value) { $row[$key] = stripslashes($value); } 
    $id = $row['id'];
    $contents = unserialize($row['contents']);
        foreach( $contents as $key => $value){
            if($key == "price"){$subtotal = $subtotal+$value;}
            echo "$key : $value <br />";
        }
    echo "<br><br><br>";
    } 
echo "<font color=red>SubTotal $subtotal</font>";

$ contents包含数组[name] => super [price] => 65.87 [quantity] => 25

所以我需要将价格乘以数量，然后取出小计（每个项目）并在循环后将其加总

Answer 1

foreach( $contents as $key => $value)
{
   if($key == "price") $total = $total+$value;

   if($key == "name")
   { 
       if(!isset($subtotal[$key])) $subtotal[$key] = 0;
       $subtotal[$key] = $subtotal[$key] + $value;
   }
}

然后，总计价格为$ total和$ subtotal数组中的每个项目

Answer 2

我不确定你对总数和小计的意思。我假设小计是一个项目的价格乘以他的数量。

总计我假设您打算以红色打印小计。

您的代码变为：

$total=0;
while($row = mysql_fetch_array($cart)){ 
    foreach($row AS $key => $value) { $row[$key] = stripslashes($value); } 
    $id = $row['id'];
    foreach($row AS $key => $value) { $row[$key] = stripslashes($value); } 
    $id = $row['id'];
    $contents = unserialize($row['contents']);
    $contents['subtotal'] = $contents['price']*$contents['quantity'];
    foreach($contents as $key => $value){echo "$key : $value <br />"; }
    $total +=$content['subtotal'];
} 
echo "<font color=red>Total: $total</font>";

如果格式不是强制性的，我会使用略有不同的解决方案用于格式化输出。（你应该查看printf format string placeholder syntax）

$billLine = "%s (%0.2f x %d): %0.2f<br /><br /><br />";
$total=0;
while($row = mysql_fetch_array($cart)){ 
    foreach($row AS $key => $value) { $row[$key] = stripslashes($value); } 
    $id = $row['id'];
    foreach($row AS $key => $value) { $row[$key] = stripslashes($value); } 
    $id = $row['id'];
    $contents = unserialize($row['contents']);
    $subtotal = $contents['price']*$contents['quantity'];
    printf($billLine, $contents['name'],
                      $contents['quantity'],
                      $contents['price'],
                      $subtotal);
    $total +=$subtotal;
} 
echo "<font color=red>Total: $total</font>";

从基本购物车脚本计算小计和总计

2 个答案: