inside while loop data not displaying in php - php

Question

Hi in the below i want to show Consultation Charges values for that i took the td.But in that td not displying anything even td also not showing.
After executing this query i want to find the no. of rows based on the rows i want to display the data.
My expected output:
Bill Particular Bill Sub Particular Doctor Date Dis. Amt.
Consultation Charges:
all the values based on no of rows.
php
<table width="100%">
<th>Bill Particular</th>
<th>Bill Sub Particular</th>
<th>Doctor</th>
<th>Date</th>
<th>Dis. Amt.</th>
<th>Charge</th>
<th>No. of Times</th>
<th>Amount</th>
</table>
<tr><th colspan=2>Consultation Charges:</th>
<?php
$div_options = array();
$sql = "SELECT ibp.ipd_bp_id, ibp.bp_id, bp.bp_name, ibp.bsp_id, bsp.bsp_name, ibp.doctor_id, ab.employee_name doctor, ibp.date date, ibp.amount charge, ibp.discount_amount discount, ibp.no_of_time, (ibp.no_of_time * ibp.amount) total_amount
FROM bill_particular_master bp
INNER JOIN ipd_bill_particular ibp ON ibp.bp_id = bp.bp_id
LEFT OUTER JOIN bill_sub_particular bsp ON bsp.bsp_id = ibp.bsp_id
LEFT OUTER JOIN address_book ab ON ab.employee_id = ibp.doctor_id
WHERE ibp.ipd_reg_no = '$ipd_no'
AND bsp.consultant =1
AND bsp.package = 0
AND bsp.admission = 0
AND bp.bp_name != 'Scan Charges'
AND bp.bp_name !='Procedure'";
$sth = $dbh->query($sql);
//$row=$dbh->fetch();
$i=1;
while($row=$sth->fetch(PDO::FETCH_ASSOC)){
$sub_arr['bp_name'] = $row['bp_name'];
$sub_arr['bsp_name'] = $row['bsp_name'];
echo "<tr>
<td>Here is the text - " . $sub_arr['bp_name'] . "</td>
<td>The ID of the text is - " .$sub_arr['bsp_name'] . "</td>";
if($i !== 0) {
echo "<td>The ID of the previous entry is - " .$sub_arr['bp_name'] . "</td>";
}
else {
echo "<td> </td>";
}
echo "</tr>";
$i = $row['bp_name'];
}
?>
</tr>

Answer 1

echo "<td>The ID of the previous entry is - " . $row['bp_name'] . "</td>";
You have there variable thats not even defined in your code.