Getting a value from a table

[Michael Smith]

I have a table whereby I can show the first row with the code below:


$sql = "SELECT delseq, serno from delseq01 order by delseq DESC limit 1 ";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "
<tr >
<td >" . $row['delseq']."</td>
<td >" . $row['serno']." </td>
</tr>
";

I want to extract "serno" as a value such as $val1 so I can use it in another part of the program.

I have used W3SCHOOLS and other references and I can't find an answer for this.