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Carrying hidden fields in a form.


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I've got a form that users enter an identification pin in for their first question  as well as clicking a radio button(Q1.php) . They click submit and the answers are put through a couple of multiplication function and then placed in a table (alongside the pin)  via Q2.php.


On the Q2 page I want to place the 2nd question that the user needs to answer. 


Rather than making them retype the pin I was hoping to process it as a hidden field - being picked up from their Q1.php entry.

This 'hidden pin echo ' process will continue throughout Q2- Q10 pages.


However - I can't seem to include any php in the page after the Q1 form has been processed.  Have I got my php tags messed up?

$con = mysql_connect("localhost","ca","d");
if (!$con)
  die('Could not connect: ' . mysql_error());
mysql_select_db("candango", $con);

$q1 =$_POST['q1'];
$pin =$_POST['pin'];

$ans1 = $q1 * 3;
$ans2 = $q1 * 5;
$ans3 = $q1 * 2;

$enter_sql= "INSERT INTO aapcm2 (pin,ans1, ans2, ans3)
VALUES ('$pin','$ans1','$ans2','$ans3')";
$enter_query =mysql_query($enter_sql) or die (mysql_error());


<p>Thank you - You have successfully entered your answers.</p><form action="q2.php" method="post">
  <p>What do you think the answer to this one is? 
    <input type="radio" name="q2" id="q2" value="-3">
    <label for="q2"></label>
  <input name="Hidden" type="hidden" id="Hidden" value="$pin" /></p>
    <input type="submit" name="button" id="button" value="Submit">


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