If statements when submitting form

[Jack]

I'm setting up a form and want to check if some conditions are met when
the form submits. If they aren't, the form displays a missing field
message and the user has to go back to fill in the missing data. If it
is met, the form continues processing. I have the $state variable coming
from a drop down SELECT option with "" being the SELECTED default.

The if statements are included inside the form tags on the form page,
not on the processing page.

<?php
if (isset($state)) { //if state is set, require the following fields
?>
<input type="hidden" name="require"
value="name,add ress,city,state ,zipcode,phone, email,question" >
<?php
}
if (!isset($state) ) { //if state is not set, require the following fields
?>
<input type="hidden" name="require"
value="name,add ress,city,count ry,zipcode,phon e,email,questio n">
<?php
}

These both work properly. But where I'm running into trouble is when I
want to further define the if statement to contain like:

if ((!isset($state )) && ($country == "USA")) {
?>
<input type="hidden" name="require"
value="name,add ress,city,state ,zipcode,phone, email,question" >
<?php
}

This doesn't work. It will allow the empty $state and the value "USA" in
$country to submit. How can I prevent this?

[Pedro Graca]

Re: If statements when submitting form

Jack wrote:
....[color=blue]
> This doesn't work. It will allow the empty $state and the value "USA" in
> $country to submit. How can I prevent this?[/color]

Put this inside the second if()

if (isset($state)) { /* whatever */ }
if (!isset($state) ) {
if ($country == "USA") {
/* whatever */
} else {
/* whatever */
}
}


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[Pjotr Wedersteers]

Re: If statements when submitting form

Pedro Graca wrote:[color=blue]
> Jack wrote:
> ...[color=green]
>> This doesn't work. It will allow the empty $state and the value
>> "USA" in $country to submit. How can I prevent this?[/color]
>
> Put this inside the second if()
>
> if (isset($state)) { /* whatever */ }
> if (!isset($state) ) {
> if ($country == "USA") {
> /* whatever */
> } else {
> /* whatever */
> }
> }[/color]

I agree the solution you give is simpler, but can't see _why_ the original
won't work. Can you point it out?
Always having a hard time with boolean logic...

[Pedro Graca]

Re: If statements when submitting form

Pjotr Wedersteers wrote:[color=blue]
> Pedro Graca wrote:[color=green]
>> Put this inside the second if()
>>
>> if (isset($state)) { /* whatever */ }
>> if (!isset($state) ) {
>> if ($country == "USA") {
>> /* whatever */
>> } else {
>> /* whatever */
>> }
>> }[/color]
>
> I agree the solution you give is simpler, but can't see _why_ the original
> won't work. Can you point it out?
> Always having a hard time with boolean logic...
>
>[/color]

Original code simplified, reformatted, and numbered:
1 <?php
2 if (isset($state)) { echo 'a'; }
3 if (!isset($state) ) { echo 'b'; }
4 if ((!isset($state )) && ($country == "USA")) { echo 'c'; }
5 ?>


When isset($state) is false this script will echo 'b' (line 3) no matter
what is the value of $country.

If, $country is 'USA' and $state is not set, the script will echo 'c'
(line 4), right after having echoed 'b';

The tests for
isset($state)
and
$country == 'USA'
are independent, but should be tested together.


--
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[For example John Smith]

Re: If statements when submitting form

Pedro Graca wrote:[color=blue]
> Pjotr Wedersteers wrote:[color=green]
>> Pedro Graca wrote:[color=darkred]
>>> Put this inside the second if()
>>>
>>> if (isset($state)) { /* whatever */ }
>>> if (!isset($state) ) {
>>> if ($country == "USA") {
>>> /* whatever */
>>> } else {
>>> /* whatever */
>>> }
>>> }[/color]
>>
>> I agree the solution you give is simpler, but can't see _why_ the
>> original won't work. Can you point it out?
>> Always having a hard time with boolean logic...
>>
>>[/color]
>
> Original code simplified, reformatted, and numbered:
> 1 <?php
> 2 if (isset($state)) { echo 'a'; }
> 3 if (!isset($state) ) { echo 'b'; }
> 4 if ((!isset($state )) && ($country == "USA")) { echo 'c'; }
> 5 ?>
>
>
> When isset($state) is false this script will echo 'b' (line 3) no
> matter what is the value of $country.
>
> If, $country is 'USA' and $state is not set, the script will echo 'c'
> (line 4), right after having echoed 'b';
>
> The tests for
> isset($state)
> and
> $country == 'USA'
> are independent, but should be tested together.[/color]
Of course! It must have been a bad day, I missed this... Tsss. Thanks Pedro!

[Jack]

Re: If statements when submitting form

Pedro Graca wrote:[color=blue]
> Pjotr Wedersteers wrote:
>[color=green]
>>Pedro Graca wrote:
>>[color=darkred]
>>>Put this inside the second if()
>>>
>>>if (isset($state)) { /* whatever */ }
>>>if (!isset($state) ) {
>>> if ($country == "USA") {
>>> /* whatever */
>>> } else {
>>> /* whatever */
>>> }
>>>}[/color]
>>
>>I agree the solution you give is simpler, but can't see _why_ the original
>>won't work. Can you point it out?
>>Always having a hard time with boolean logic...
>>
>>[/color]
>
>
> Original code simplified, reformatted, and numbered:
> 1 <?php
> 2 if (isset($state)) { echo 'a'; }
> 3 if (!isset($state) ) { echo 'b'; }
> 4 if ((!isset($state )) && ($country == "USA")) { echo 'c'; }
> 5 ?>
>
>
> When isset($state) is false this script will echo 'b' (line 3) no matter
> what is the value of $country.
>
> If, $country is 'USA' and $state is not set, the script will echo 'c'
> (line 4), right after having echoed 'b';
>
> The tests for
> isset($state)
> and
> $country == 'USA'
> are independent, but should be tested together.[/color]

Thank you Pedro. While it's great to have someone write a working code
to correct my mistake, it's always nice to see an explanation of why
something I wrote did or didn't work. Seeing this was a big help in
understanding where I went wrong.

Jack