Quick is_numeric() Question

[Spunge]

I'm working on a small calculator script for personal use, and I'm having problems with limiting the input to only numbers. This is what I have:

[code]elseif ((! is_numeric($a)) || (! is_numeric($b)) || (! is_numeric($c))) {
echo " Please enter only numbers.";}[/code]

It will filter out letters, but it also filters out 0s, which is not what I'm after. Anyone know a potential solution to make this treat 0s as a normal number?

[Ninjakreborn]

regular expressions

[Ninjakreborn]

http://forums.invisionpower.com/lofiversion/index.php/t183068.html

[Spunge]

Thanks, but I'm still having problems. I've got to be missing something... No matter what I do, it's thinking zero is either not a number, or that the form is empty.

[Unknown User]

Can't you just embed an if in the elseif statement you have, checking that its not equal to 0?

[code]elseif ((! is_numeric($a)) || (! is_numeric($b)) || (! is_numeric($c)))
  {
    if( $a != '0' && $B != '0' && $c != '0')
      {
        echo " Please enter only numbers.";
      }
  }[/code]
sorry if i'm completly wrong, new to php