I'm trying to do a simple operation of two numbers but the operation returns a wrong result.
The number are for example 46.29
and 10
. The first one in the $a
variable and the second one in the $b
variable.
Process
echo $a * $b
returns 460
echo 10 * 46.29
print the right number (462.90)
$a * 10
and
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
I tried also to use bcmul
, and in this case it will print 0.
Here you can find my code:
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;
What's the problem with this?
EDIT: PROBLEM SOLVED with this code:
//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;
The ,
character is not valid for a floating point number.
Try to replace it with str_replace(",",".",$a);
. Even try to do it with both numbers if you wish.
The "official" decimal separator (for PHP) is a point (.
), that's why it fails doing the multiplication. In your language it might be the comma, but PHP uses a dot.
This is what PHP would say (to floatval($a)
):
Ok, I got two characters, which is a valid number (
46
), but after that there's a weird symbol, I'll just throw a warning, add a decimal point and a zero (cause I found no other decimal points), and end the conversion here.
If you use this code, it should work:
str_replace(",",".",$a);
str_replace(",",".",$b);
echo floatval($a) * floatval($b);
Explanation:
As I said, you're using a decimal comma, which is invalid. What str_replace(original, replacement, subject)
does is that it finds all occurrences of original in a string (here: subject) and replaces it with the replacement value. This results in replacing that decimal comma with a decimal point.
Example: 40,3
becomes 40.3
This still results in a String data type, which is obviously not a number. To convert it, we use the method floatval(string)
, which results in a Float data type, which is short for Floating-point number and after that, we can perform arithmetical operations.
Your locale
is using a different sign for the decimal point. I suspect when you read the numbers from a file they are in the "wrong" format - e.q. 46,29
and not 46.29
as I can see from the echo
.
Replace the ,
to .
and then the issue is fixed.
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