type value in $_GET['something']

[absynthe]

I want to check if ID is an integer. It works if I do it that way :
if (preg_match("/^[0-9]+$/", $_GET['id'])) {
// do something...
}

But howcome it ain't working with :
if (is_int($_GET['id'])) {
// do something...
}

does it mean that value from $_GET are always set to same type (I suppose it's string type)?

[RedDragon]

is_int does only check if the var type is an integer:

example:

$var1 = 1;
$var2 = "2";

if(is_int($var1)) {
echo "var1 is";
}
if(is_int($var2)) {
echo "var2 is";
}

this will only echo var 1 is

better is if you use is_numeric