Table from SQL query with header - php

Question

I have created a table from a SQL query and displayed it in the same order as they appear in the table. (Table A in image).
This is working okay.
However it would be great if the data could be clubbed under the member category. As in Table B in image.
SQL Query ...
$row = mysqli_num_rows($sql);
if($row > 0) {
while ($result = mysqli_fetch_assoc($sql)){
$category[] = trim($result['category']);
$name[] = trim($result['f_name']).' '.trim($result['l_name']);
$memid[] = trim($result1['memid']);
$addr[] = trim($result['addr']);
$phone[] = trim($result['phone']);
}
} ?>
<table>
<tr>
<th>Category</th>
<th>Mem ID</th>
<th>Name</th>
<th>Address</th>
<th>Phone</th>
</tr>
<?php
if ($row>0) {
for ($i=0; $i<=$row-1; $i++){ ?>
<tr>
<td><?php echo $category[$i]; ?></td>
<td><?php echo $memid[$i]; ?></td>
<td><?php echo $name[$i]; ?> </td>
<td><?php echo $addr[$i]; ?> </td>
<td><?php echo $phone[$i]; ?> </td>
</tr>
<?php }
} ?>
</table>

Answer 1

A little update of your code souhld do it:
$categories = [];
$row = mysqli_num_rows($sql);
if($row > 0) {
while ($result = mysqli_fetch_assoc($sql)) {
$result_category = trim($result['category']);
if (!isset($categories[$result_category])) {
$categories[$result_category] = [];
}
$new = [];
$new['category'] = $result_category;
$new['name'] = trim($result['f_name']).' '.trim($result['l_name']);
$new['memid'] = trim($result['memid']);
$new['addr'] = trim($result['addr']);
$new['phone'] = trim($result['phone']);
$categories[$result_category][] = $new;
}
} ?>
<table>
<tr>
<th>Category</th>
<th>Name</th>
<th>Phone</th>
</tr>
<?php
if ($row>0) {
foreach ($categories as $category_name => $data){ ?>
<tr>
<td><?php echo $category_name; ?></td>
<td></td>
<td></td>
</tr>
<?php foreach ($data as $row) {?>
<tr>
<td><?php echo $row['memid']; ?></td>
<td><?php echo $row['name']; ?> </td>
<td><?php echo $row['phone']; ?> </td>
</tr>
<?php }
}
} ?>
</table>

Answer 2

While loop though the data mark on array with group of category name and then print the result
$row = mysqli_num_rows($sql);
if($row > 0) {
$mainArray = [];
while ($result = mysqli_fetch_assoc($sql)){
$category = $result['category'];
if(isset($mainArray[$category])){
$mainArray[$category][] = $result;
} else {
$mainArray[$category] = $result;
}
}
}
foreach($mainArray as $cateName => $data){ ?>
<tr>
<td style="text-align:left"><?php echo $cateName; ?></td>
<td></td>
<td></td>
</tr>
<?php
foreach($data as $row){ ?>
<tr>
<td><?php echo $row['memid']; ?></td>
<td><?php echo $row['f_name'].' '.$row['l_name']; ?></td>
<td><?php echo $row['phone']; ?></td>
</tr>
<?php } ?>
}
?>