Question

我从XMl获得一些奖励并想要计算总和。为什么不是$M_commission 166.63的输出？

$i = 0;
$commission_trans = 0;
foreach($responseXml->lead as $lead)
{
    if ($i == 0) {
        $last_trans = $lead->leadTime;
    }
    $commission_trans = $commission_trans + $lead->reward; 
    echo $lead->reward;
    echo "\n";
    $i++;
}

$M_lastclick = $last_trans;
$M_commission = number_format($commission_trans, 2);

echo $M_commission;
echo "\n";
echo $M_lastclick;

输出： 100.0 0.63 3.0 30.0 3.0 30.0 166.00 2013-05-10T13：42：01.058 + 02:00

我试过

    $commission_trans = number_format($commission_trans + $lead->reward, 2);

但输出相同。

Tnx很多！

Answer 1

“XML”表示，这来自某些XML流（simple_xml？）：

foreach($responseXml->lead as $lead)

因此，对象成员（$lead->reward）是字符串，而不是浮点数。

$commission_trans初始化为普通零，因此它是一个整数。

这一行$commission_trans = $commission_trans + $lead->reward;给出了：

(int) = (int) + (string);

我会尝试将XML字符串显式转换为float：

$i = 0;
$commission_trans = 0.0;
foreach($responseXml->lead as $lead)
{
    if ($i == 0) {
        $last_trans = $lead->leadTime;
    }
    $commission_trans += floatval($lead->reward); 
                         // or (float)$lead->reward;
    echo $lead->reward;
    echo "\n";
    $i++;
}

Answer 2

我认为标记$first优于$i++。

$first = true;
$commission_trans = 0.0;
foreach($responseXml->lead as $lead) {
    if ($first) {
        $last_trans = (float)$lead->leadTime;
        $first = false;   
    }
    $commission_trans += (float)$lead->reward; 
    echo $lead->reward.PHP_EOL;
}

$M_lastclick = $last_trans;
$M_commission = number_format($commission_trans, 2);

echo $M_commission.PHP_EOL;
echo $M_lastclick;

对Ideone进行测试：http://ideone.com/1pi7mQ

PHP用小数计算

2 个答案: