Group output of MySql Query - php

Question

I have the following PHP/MySql:
$sql = "SELECT * from tblDigest";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
echo "<table><tr>
<th>Diagram</th>
<th>Headcode</th>
<th>Date</th>
<th>Dep Time</th>
<th>Origin</th>
<th>Destination</th>
<th>Arr Time</th>
<th>Booked Traction</th>
<th>Actual Traction</th>
<th>Type</th>
</tr>";
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<tr>";
echo "<td>" . $row["diagram"] . "</td>";
echo "<td>" . $row["headcode"] . "</td>";
echo "<td>" . $row["depDate"] . "</td>";
echo "<td>" . $row["depTime"] . "</td>";
echo "<td>" . $row["origin"] . "</td>";
echo "<td>" . $row["destination"] . "</td>";
echo "<td>" . $row["arrTime"] . "</td>";
echo "<td>" . $row["bookedTraction"] . "</td>";
echo "<td>" . $row["actualTraction"] . "</td>";
echo "<td>" . $row["type"] . "</td>";
echo "</tr>";
}
echo "</table>";
}
I would like to group the results by 'diagram', so that I can display them as an accordion. Is there any easy way to do this?
Failing that, how can I get the value for the first row of the table (so I can have a $diagNo variable and compare $row["diagram"] against that to find out when it has changed.

Answer 1

Sort your results by diagram and watch when its value changes:
$sql = "SELECT * from tblDigest ORDER BY diagram";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
echo "<table><tr>
<th>Diagram</th>
<th>Headcode</th>
<th>Date</th>
<th>Dep Time</th>
<th>Origin</th>
<th>Destination</th>
<th>Arr Time</th>
<th>Booked Traction</th>
<th>Actual Traction</th>
<th>Type</th>
</tr>";
// output data of each row
$oldDiagram = '';
while($row = $result->fetch_assoc()) {
if($oldDiagram == '')
{
// this is the first diagram - create the first accordeon
$oldDiagram = $row['diagram'];
}
elseif($oldDiagram != $row['diagram'])
{
// a new group starts right now - create new accordeon
$oldDiagram = $row['diagram'];
}
echo "<tr>";
echo "<td>" . $row["diagram"] . "</td>";
echo "<td>" . $row["headcode"] . "</td>";
echo "<td>" . $row["depDate"] . "</td>";
echo "<td>" . $row["depTime"] . "</td>";
echo "<td>" . $row["origin"] . "</td>";
echo "<td>" . $row["destination"] . "</td>";
echo "<td>" . $row["arrTime"] . "</td>";
echo "<td>" . $row["bookedTraction"] . "</td>";
echo "<td>" . $row["actualTraction"] . "</td>";
echo "<td>" . $row["type"] . "</td>";
echo "</tr>";
}
echo "</table>";
}