> if ($cardID=''||is_int($cardID))
Two problems with that statement:
First of all, this statement _sets_ cardID to '', and then (I think)
returns a false value since '' doesn't evaluate to true. You probably
wanted ==.
Second of all, now that $cardID is '', it certainly isn't an int. It
isn't an int, and it wouldn't be an int if you fixed that statement
because is_int only tests if it is, actually, an integer.
$HTTP_GET_VARS['cardID'] could be '123', but it can't be 123 and so
that will be false. From the PHP manual:
Note: To test if a variable is a number or a numeric string (such
as form input, which is always a string), you must use is_numeric().
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