PHP code is not submitting data from POST - php

Question

It was working until I tried adding this statement
<?php echo "<input type=\"hidden\" name=\"hidden1\" value=\"$id\">" ?>
I was able to get the indexnum from my form before but when I added that line nothing seems to load in the fields.
Here is the full form:
<form name="approveform" method="POST" action="">
<?php echo "<input type=\"hidden\" name=\"hidden1\" value=\"$id\">" ?>
Index Number*: <input type="text" name="IndexNum">
<input type="submit" value="Approve" action="">
</form>
Its getting late and I probably need to just go to sleep but IM SO CLOSE!!! Here is the full code that processes the POST.
if($user_data['permissions'] >= 1)
{
// If users permission is 1 or 2 they get a field for inputting the index # and a button to change the approve field from 0 to 1 may need to make a new field to record who approved it....
//Determine if the order is already approved. If not approved show index field and allow user to approve it with index number
if($data2[0]['Approved'] == 1)
{
echo " <font color=\"green\"> Approved";
}
if($data2[0]['Approved'] == 0)
{
echo " Not Approved. Supply an index number and click approve to authorize this order to be completed.";
if (empty ($_POST) === false)
{
$required_fields = array('IndexNum');
foreach ($_POST as $key=>$value)
{
if (empty($value) && in_array($key, $required_fields) === true)
{
$errors[] = 'Fields marked with an asterisk are required';
break 1;
}
}
if (isset($_POST['success']) === true && empty($_POST['success']) === true)
{
echo 'Index has been updated and Order is now set to Approved';
}
else
{
if (empty($errors) === true)
{
$indexnum=$_POST['IndexNum'];
$approvedby=$user_data['lname'];
$vendorid1= $_POST['hidden1'];
echo $indexnum;
echo $approvedby;
echo $vendorid1;
//update_approved($indexnum, $approvedby, $vendorid1);
//header('Location: index.php');
//exit();
}
else if(empty($errors) === false)
{
echo output_errors($errors);
}
}
}
?>
<form name="approveform" method="POST" action="">
<?php echo "<input type=\"hidden\" name=\"hidden1\" value=\"$id\">" ?>
Index Number*: <input type="text" name="IndexNum">
<input type="submit" value="Approve" action="">
</form>
<?php }
}
Thank you all for looking into this. I get that $id value from a previous POST. I use it elsewhere in the code without issue.
Thank you all so much!

Answer 1

Try like
<input type="hidden" name="hidden1" value="<?php echo $id;?>">
Also try like
<?php echo '<input type="hidden" name="hidden1" value=".$id.">' ?>