php字符串=>浮动铸造不起作用

Question

I have 2 numbers in strings

$xml = "13.52";
$value = "2";

and i want to multiply them.

i have tried:

$subtotal = $xml * $value;

Based on the manual, this should work. I've already tried

$subtotal = (float)$xml * (float)$value;

and

$xml = floatval($xml);
$value = floatval($value);
$subtotal = $xml * $value;

I have no idea what i have broken. There is no other help in the manual.

EDIT: looking at the html-source for the variables, it seems there was part of the xml () attached to the variable. Thanks for the help clearing my mind.

Answer 1

Are you sure your problem is where you think it is?

Based on the follow code, I get:

<?php
    $xml = "13.52";
    $value = "2";

    $subtotal = $xml * $value;
    echo $subtotal."<br>";

    $subtotal = (float)$xml * (float)$value;
    echo $subtotal."<br>";

    $xml = floatval($xml);
    $value = floatval($value);
    $subtotal = $xml * $value;
    echo $subtotal."<br>";
?>

27.04
27.04
27.04

For the most part, PHP is exceptionally forgiving when it comes to typecasting/juggling.