How to find if a string is an integer?

I would like to test wether a $_POST var is an integer or not. What is the best way? I ahve tried is_int() but that fails b/c $_POST vars are always strings. is_numeric() doesn't help because it doesn't differentiate bewteen numbers (1.0) and integers (1). The best I have been able to come up with is: if (is_numeric($var) && is_int((int)$var)) But I ma hoping there is something simpler ... Any ideas? thansk, Jean-Christian Imbeault