Adding INT Variables

David03

I am sending two items of data (INT data) from a form to a new .php page. I want to simply manipulate them in ways such as add, multiply, etc. This code doesn't work and I'm not sure why. If you have any tips on manipulating int data, please also post it! Thanks!

$resHP = $lvl * $hp;
echo("Your HP is: $resHP");

planetsim

Where is $lvl amd $hp getting defined? Are they straight from the Form ? If so you want to use $_POST['lvl'] etc.

For more things you can do you may want to view the Operators section of the Manual.

David03

They are coming directly from the form yes. Thanks for the link, I'm gonna check it out.

[edit added below content]

I tried using the $_POST method like this

$resHP = $_POST['lvl'] * $_POST['hp'];

echo("Your HP is: $resHP");

And I get a zero for the HP value. (both lvl and hp were set to 5 in the form, so it should give me 25 not 0.

kburger

Let's see the form.

dotnotwhat

If your form was submitted using GET method, change POST to GET.

For example:-

$resHP = $_GET['lvl'] * $_GET['hp'];

echo("Your HP is: $resHP");

halojoy

Can it be that form input are strings?
in that case try
$res = (int)$var1 * (int)$var2;

php is usually good at convert to other types automatically = 'type juggling'

dotnotwhat

If they are strings, you may wish to check for this for validation purposes before processing.

The (int) type casting will work fine on it's own but bear in mind that strings will be forced to integers whatever the string. So:-

$a = 'some ball of string';
$b = (int) $a;
echo $b;

This would output 0 (zero). If this could cause a problem in your script, test the user input first to check it is valid. You could do this with is_numeric(), is_int(), etc.

ysu

umm...may sound too simple, but have you tried simply echoing the variables if they are set at all?
echo $_REQUEST['lvl'];
should work on post or get data all the same