Number will not Multiply Because of JS use? Please help!!

I’ve got this problem where I’m using JS to grab today’s currency rates and I’m trying to multiply that currency rate with a value that the user enters.

I’ve created another page called currency.php just to try and troubleshoot the problem, but I can’t seem to get it.

If I echo $var1, it will give the conversion perfectly fine.

[code=php]
$var1 = “<script>currency_show_conversion(100,’USD’,’CAD’);</script>”;
[/code]

Now if I try to multiply $var1 * $var2, the result will be 0. Does anyone know why this is happening or how I can fix it?

[code=php]
$var1 = “<script>currency_show_conversion(100,’USD’,’CAD’);</script> CAD<br>”;
$var2 = 20;
$calculation = $var1 * $var2;

echo $calculation;
[/code]

EDIT:
I should also note that I’ve tried this and it does not work.

[code=php]
$var1 = “<script>currency_show_conversion(100,’USD’,’CAD’)</script>”;
$var_int = $var1;
$var2 = 20;
$var = $var_int * $var2;

echo $var;
[/code]

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