[PHP] Frustation with data validation

[Robert E. Harvey, M.D.]

First, thanks to all who offered suggestions with my "simple ereg 
question".  I have been unable to get anything to work "properly" in 
spite of many good suggestions.  The problem I want to solve is to 
ensure that input fields have either an integer number or are blank 
before the program proceeds.  I am approaching the problem thusly:

for ($i=1;$i<=3;$i++)
{
 echo $_POST["grass_$i"]; // Pollen name 
 echo $_POST["gamt_$i"]; // Pollen amount
 if (is_int($_POST["gamt_$i"]))
 {
   continue;
 }
  else
    {
      die("Non-numeric data entered in grass entry field(s).");
    }
}

The two echo statements accurately return what data is in the two input 
fields.  The program dies when there is integer data returned in the 
echo $POST["gamt_$i"] statement.

If I negate the expression in the if statement like so :  if 
(!is_int($_POST["gamt_$i"]))
the program runs.  Isn't that a bit weird?

It gets weirder.  If I enter an alpha character with if 
(!is_int($_POST["gamt_$i"])), the program still runs but treats the 
alpha character as a 0.

How should I construct that if statement so that the program will only 
run with integer data or no data entered into the input fields?

TIA

Bob Harvey

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