Highlighting table rows based on conditional formatting of sql query - php

Question

EDITED
I have an sql query and I want to highlight the table row with a red highlight so that if the transaction_date = 0000-00-00 that whole row is highlighted with red. Here is the snippet of the code. The transaction_date shows the date that a specific training course was taken and if the course wasn't taken then the date that will be returned will be 0000-00-00. Any help would be greatly appreciated. Thank you.
$sql = "SELECT DATE_FORMAT(date_fluids, '%m/%d/%Y ') AS transaction_date, first_name, last_name, supervisor_group, trade, t_id, c_id, department_number, date_fluids, fluids_refresh, fluid_period, employee_type
FROM peopleinfo WHERE
(last_name LIKE '%$value1%' )
and
(trade LIKE '%$value2%')
and
(t_id LIKE '%$value3%')
and
(c_id LIKE '%$value4%')
and
(department_number LIKE '%$value5%')
and
(date_fluids LIKE '%$value6%')
and
(date_lock LIKE '%$value7%')
and
(date_confine LIKE '%$value8%')
and
(date_fall LIKE '%$value9%')
and
(supervisor_group LIKE '%$value10%')
AND
(employee_type='1')
ORDER BY last_name ASC";
$query = mysqli_query($conn, $sql);
$row = (mysqli_fetch_array($query));
if (!$query) {
die ('SQL Error: ' . mysqli_error($conn));
}
while ($row = mysqli_fetch_array($query))
{
if ($row['transaction_date'] == 0000-00-00){
echo '<tr class="highlight">';
echo '<td >' . $row['first_name']. '</td>';
echo '<td >' . $row['last_name']. '</td>';
echo '<td >' . $row['supervisor_group']. '</td>';
echo '<td >' . $row['trade']. '</td>';
echo '<td >' . $row['t_id']. '</td>';
echo '<td >' . $row['c_id']. '</td>';
echo '<td >' . $row['department_number']. '</td>';
echo '<td >' . $row['transaction_date']. '</td>';
echo '<td >'. $row['fluid_period']. '</td>';
echo '</tr>';
} else {
echo '<tr >';
echo '<td >' . $row['first_name']. '</td>';
echo '<td >' . $row['last_name']. '</td>';
echo '<td >' . $row['supervisor_group']. '</td>';
echo '<td >' . $row['trade']. '</td>';
echo '<td >' . $row['t_id']. '</td>';
echo '<td >' . $row['c_id']. '</td>';
echo '<td >' . $row['department_number']. '</td>';
echo '<td >' . $row['transaction_date']. '</td>';
echo '<td >'. $row['fluid_period']. '</td>';
echo '</tr>';
}
}
mysqli_free_result($query);
mysqli_close($conn);
?>
</tbody>
</table>

Answer 1

I would just do:
echo '<tr' . ($row['transaction_date'] === '0000-00-00' ? 'class="highlight"' : '') . '>
and then use css to highlight it however you want.