is_int and GET or POST

Question

Why does is_int always return false in the following situation?

echo $_GET[\'id\']; //3
if(is_int($_GET[\'id\']))
    echo \'int\'; //not execut         


        

Answer 1

The dirty solution I'm using is this:

$val = trim($_GET['id']);
$cnd = ($val == (int)$val);
echo $cnd ? "It's an int" : "Not an int";

Apart from the obvious (ugly code that hides its workings behind specifics of the php engine), does anybody know cases where this goes wrong?