Re: How to find if a string is an integer?

Felipe Desiderati wrote:

try this: if (ereg("^[0-9]+$", $_POST["var_int"))

    echo "is int";

That's not the best regexp. It doesn' take into account negative integers and isn't there a [[:numeric:]] or something like regexp that would work better. I'm looking for the simplest method and the one that takes the less processing power :) Calling up the regular expression engine dounds pretty processing intensive ...