[nycphp-talk] Form not working as expected

Rolan Yang rolan at
Fri Mar 14 01:02:21 EDT 2008

mikesz at wrote:
> Hello and Warm Greetings,
> I have a form that I have been asked to modify and thought it was a
> straight forward and simple MOD but it seems to have some a condition
> that I didn't count on when I agreed to make the change and I need
> some advice.
> =instructions for formatting most of the time, even with an example
> provided. The form does a lookup to see if the birthdate matches the
> one that is stored in the database. In the lookup, it compares the
> value in $_POST['birthdate'] with the value in the database. The text
> box works fine if you enter the correct yyyy-mm-dd format.
> The replacement dropdown has three $_POST values very creatively
> assigned, $_POST['year'],$_POST['month'],$_POST['day']. To compensate
> for the replacement of $_POST['birthdate'] and try to make the change
> transparent to the rest of the script I generated it manually in a
> hidden field (I actually thought this one WAS creative until I
> discovered that it didn't work as I expected, lol),
> <input type="hidden"  value="<?=$_POST['year'] . "-" . $_POST['month'] . "-" . $_POST['day'];?>" name="birthdate">
> The problem, as you may have already guessed is that
> $_POST['birthdate'] gets no date values until AFTER the submit button
> and that is too late for it to do its database compare so it fails. If
> you rerun the form entry a second time the script works, no problem
> but the first time through nada.
> ...
> I have tried replacing the $_POST['birthdate'] with a variable
> $birthdate that I generate manually with the correct data and pass it
> to the diff function but that breaks the script so that it doesn't work

Try adding this to the top of your script:

if ($POST['year']) {

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