testing number?

[nikko50]

Hello all.
What's the best way to test if a value is a whole number greater than 0? If $quantity=2 is there a built in function or something test $quantity.

[sfullman]

if(is_int($number) && $number>0){
   //this is a positive integer
}

[nikko50]

Won't evaluate true. Why not? Thanks
$quantity=3;
if(is_int($quantity) && $quantity>0){
echo "YES";
}

[nikko50]

Came up with this.
function is_whole_number($var){
return (is_numeric($var)&&(intval($var)==floatval($var)));
}

IF(isset($_GET['Process'])){
foreach($itemid as $key=>$value){
if($value!="" && is_whole_number($quantity[$key])&& $quantity[$key]>0){
SetStatus($orderid,$value,$link,$realname,$quantity[$key]);
}