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 ...
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