PHP中的错误乘法

例如,数字为46.29和10. $a变量中的第一个变量和$b变量中的第二个变量.

处理

echo $a * $b

returns 460

echo 10 * 46.29

print the right number (462.90)

$a * 10

和

46.29 * $b

result is always the same: 460!

echo $a

print 46,29

echo $b

print 10

echo floatval($a) * floatval($b)

print 460

echo intval($a)

print 46

我也尝试使用bcmul,在这种情况下它将打印0.

在这里你可以找到我的代码：

include 'simple_html_dom.php';

     $anno = $_POST['Anno'];
     $punti = $_POST['Punti'];
     $eta = $_POST['Eta'];
     $ggAss = $_POST['GgAss'];
     $ggParz1 = $_POST['GgParz1'];
     $ggParz2 = $_POST['GgParz2'];
     $ggParz3 = $_POST['GgParz3'];
     $pctDM = $_POST['PctDM'];
     $calcoloDM = $_POST['CalcoloDannoMorale'];
     $speseMediche = $_POST['SpeseMediche'];
     $spese = $_POST['Spese'];

    $html = file_get_html('..tabella'.$anno.'.php');

    $rows = $html->find('tr');

    // This variable is use to make sure that the correct number will be display. (there is a kind of offset in the output table).
    $const = 2;


    $i = 0;
    $cond = false;
    foreach ($rows as $row) {
        $j = 0;
        foreach ($row->children() as $cell) {
            if($cond)
                break;
            //This condition is used to get punto base e indennità giornaliera
            if($i == 1) {
                $var1 = explode(" ",$cell->plaintext);
                $indennitaGG = $var1[10]; // here we can get indennità giornaliera
            }
            if($i == ($eta + $const) && $j == $punti) {
                $dannoBP = $cell->plaintext;
                $cond = true;
                break;
            }
            $j++;
        }
        $i++;
    }

    $calcIndGG = $indennitaGG * $ggAss;
    $newVar = $indennittaGG;
    echo 46.29 * 10;
    $calcIndParz1 = ($indennitaGG * 75 / 100) * $ggParz1;
    $calcIndParz2 = ($indennitaGG * 50 / 100) * $ggParz2;
    $calcIndParz3 = ($indennitaGG * 25 / 100) * $ggParz3;
    $dm = ($calcIndGG + $calcIndParz1 + $calcIndParz2 + $calcIndParz3) * $pctDM / 100;

    $totale = $dannoBP + $calcIndGG + $calcIndParz1 + $calcIndParz2 + $calcIndParz3 + $dm + $speseMediche + $spese;

这有什么问题？

编辑：
问题已解决此代码：

//This change is used to transform the variable $indennitaGG in the right form. (with the . and not with the,). Then we can make the cast to float.


    $temp = str_replace(",",".",$indennitaGG);
        $indennitaGG = (float)$temp;