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Undefined Variable


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Hey, I'm trying to code a code a user has to input before continuing the registering to my site, for example what I'm trying to do is this: 1 + 3 = 5. So it will randomly give 2 numbers which then the user has to submit the right answer to carry on although its saying I have a undefined variable, which the variable I'm using is defined.


My code:

if ($Code){$NumberOne = 1;$NumberTwo = 50;$RandomNum = rand($NumberOne, $NumberTwo);$RandomNum1 = rand($NumberTwo, $NumberOne);$Output = $RandomNum;$Output1 = $RandomNum1; // Doing the sum..if ($Output >= 1 || $Output1 >= 1){$Sumfin = $Output + $Output1;$Eq = $SumFin; if ($Sumfin != $Eq){$Message = "Incorrect number adding";$Succ = "no";}elseif ($Sumfin == $Eq){$Succ = "yes";} }elseif ($Output > 50 || $Output1 > 50){$Message = "Something went wrong.";$Succ = "no";}}

How I'm out putting it:
<td width="50%">Secruity Code:</td><td width="50%"><?php echo $Output;?> + <?php echo $Output1; ?>: <input type="text" name="Code" id="Scode" class="TextInput" maxlength="3"></td>
So what can I do here differently to remove the error?
Thanks for your help :)
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Just posting snippets won't help. The only reason that we can assume from that is $Code is not set and you are echoing it out of that conditional.

There the only errors its getting, but with $Code I'm doing: 


if (strip_tags($_POST['Code'])){
$Code = safe($_POST['Code']);
// Then that code.

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Maybe you should rethink your logic.


The variables $Output and $Output1 are only defined when the variable $_POST['Code'] exists, In other words when the form has been submitted. Obviously you want these variables defined when the form has not not been submitted so the user can give an answer to your sum.


However that is only one part of the problem. The next issue you'll face is how are you going to know the user gave the correct answer to the sum? The variables $Output and $Output1 will not be remembered. You'll need to pass on the answer to the sum (either as a hidden form field or as a session/cookie value), so when form has been submitted your code can validate that the user gave the correct answer.

Edited by Ch0cu3r
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