Form Loop Error - php

Question

I have a form which loops if the value indicated is less than or equal the number of 'enrollee's needed. The while loop works perfectly with one exception, I use DOB fields which ALSO use FOR loops to display their values. If I remove the DOB fields, the form loop works fine, when left in, it errors out. Any ideas?
<form id="Enroll_Form" action="<?php $_SERVER['PHP_SELF']; ?>" method="post" name="Enroll_Form" >
<?php
$i=1;
while ($i <= ($_SESSION['Num_Members'])): {?>
<table class="demoTable">
<tr>
<td>First Name: </td>
<td><input type="text" name="F1FirstName" value="<?php echo $fields['F1FirstName']; ?>" /></td>
</tr>
<tr>
<td>Middle Initial: </td>
<td><input type="text" name="F1MI" size="2" maxlength="1" value="<?php echo $fields['F1MI']; ?>" /></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input type="text" name="F1LastName" value="<?php echo $fields['F1LastName']; ?>" /></td>
</tr>
<tr>
<td>Federation No: </td>
<td><input type="text" name="F1FedNum" maxlength="10" value="<?php echo $fields['F1FedNum']; ?>" /></td>
</tr>
<tr>
<td>SSN: </td>
<td><input type="text" name="F1SSN1" size="3" maxlength="3" value="<?php echo $fields['F1SSN1']; ?>" /> -
<input type="text" name="F1SSN2" size="2" maxlength="2" value="<?php echo $fields['F1SSN2']; ?>" /> -
<input type="text" name="F1SSN3" size="4" maxlength="4" value="<?php echo $fields['F1SSN3']; ?>" />
</td>
</tr>
<tr>
<td>Date of Birth</td>
<td>
<select name="F1DOB1">
<option value="">Month</option>
<?php
for ($i=1; $i<=12; $i++)
{
echo "<option value='$i'";
if ($fields["F1DOB1"] == $i)
echo " selected";
echo ">$i</option>";
}
?>
</select> /
<select name="F1DOB2">
<option value="">Day</option>
<?php
for ($i=1; $i<=31; $i++)
{
echo "<option value='$i'";
if ($fields["F1DOB2"] == $i)
echo " selected";
echo ">$i</option>";
}
?>
</select> /
<select name="F1DOB3">
<option value="">Year</option>
<?php
for ($i=date('Y'); $i>=1900; $i--)
{
echo "<option value='$i'";
if ($fields["F1DOB3"] == $i)
echo " selected";
echo ">$i</option>";
}
?>
</select>
</td>
</tr>
<tr>
<td>Address: </td>
<td><input type="text" name="F1Address" value="<?php echo $fields['F1Address']; ?>" /></td>
</tr>
<tr>
<td>City: </td>
<td><input type="text" name="F1City" value="<?php echo $fields['F1City']; ?>" /></td>
</tr>
<tr>
<td>State: </td>
<td><select name="F1State"><option value="">Choose a State</option><?php showOptionsDrop($states_arr, null, true); ?></select></td>
</tr>
<tr>
<td>Zip Code: </td>
<td><input type="text" name="F1Zip" size="6" maxlength="5" value="<?php echo $fields['F1Zip']; ?>" /></td>
</tr>
<tr>
<td>Contact Telephone No: </td>
<td>( <input type="text" name="F1Phone1" size="3" maxlength="3" value="<?php echo $fields['F1Phone1']; ?>" /> )
<input type="text" name="F1Phone2" size="3" maxlength="3" value="<?php echo $fields['F1Phone2']; ?>" /> -
<input type="text" name="F1Phone3" size="4" maxlength="4" value="<?php echo $fields['F1Phone3']; ?>" />
</td>
</tr>
<tr>
<td>Email:</td>
<td><input type="text" name="F1Email" value="<?php echo $fields['F1Email']; ?>" /></td>
</tr>
</table>
<br />
<?php } $i++; endwhile; ?>
<div align="right"><input class="enrbutton" type="submit" name="submit" value="Continue" /></div>
</form>

Answer 1

You are using $i in your while loop, and in all of your for loops. You need to change it to something else.
That is probably causing you some problems (not to mention it being terribly hard to understand)