How to fetch data in table group by other column in PHP - php

Question

I have a record like this in database:
section_id description level_id
1 Amethyst 1
2 Betelguise 1
3 Daisy 2
4 Rose 2
I want it to display in my php table just like this:
Level 1
Amethyst
Betelguise
Level 2
Daisy
Rose
Can anyone please help me? I am new at this.
Here's my code:
<table>
<thead>
<tr>
<th>Descriptions</th>
<th>Level</th>
</tr>
</thead>
<?php $sql = "SELECT * FROM tbl_sectiontaken"; ?>
<?php $result = $db->query($sql); ?>
<?php if ($result->num_rows > 0) { ?>
<?php while($row = $result->fetch_assoc()) { ?>
<?php $id = $row['section_id'];
$desc = $row['description'];
$gr = $row['level_id']; ?>
<tbody>
<tr>
<td style="text-transform:capitalized;">
<?php echo $desc; ?>
</td>
<td style="text-transform:capitalized;">
<?php echo $gr; ?>
</td>
</tr>
<?php } ?>
<?php } ?>
</tbody>
</table>
But it gives me this result in table:
Descriptions Level
Amethyst 1
Betelguise 1
Daisy 2
Rose 2

Answer 1

You can use group_concat function for this. Use below code if suits your requirements
<?php $sql = "SELECT level_id,GROUP_CONCAT(description) AS description FROM series group by level_id"; ?>
<?php $result = $db->query($sql); ?>
<?php if ($result->num_rows > 0) { ?>
<?php while ($row = $result->fetch_assoc()) { ?>
<?php
$id = $row['section_id'];
$desc = $row['description'];
$gr = $row['level_id'];
$leveArr[$gr][] = $desc;// Create an array with level and description
} } ?>
</tbody>
<table>
<tr><!-- header-->
<?php foreach ($leveArr as $key => $value) { ?>
<td><?php echo "LEVEL " . $key ?></td>
<?php } ?>
</tr>
<tr>
<?php foreach ($leveArr as $key => $value) {
foreach ($value as $key_1 => $data) { ?>
<td><?php
$data = explode(",", $data);
foreach ($data as $key_2 => $final) {
echo $final . "<br>";
}
?></td>
<?php }
} ?>
</tr>
</table>

Answer 2

Updated
Check the sandbox example
Change query with GROUP_CONCAT
SELECT GROUP_CONCAT(if (description ='', null, description)) as description,count(description) as heigher,level_id FROM yourtablename WHERE 1 GROUP BY level_id
And After.They return array like this
$arr=[['description'=>'a,b,c,d','level_id'=>'1','heigher'=>'4'],['description'=>'a,b,c,d','level_id'=>'2','heigher'=>'4']]; ?>
Then Finally Create Table as like this
$sql="SELECT GROUP_CONCAT(if (description ='', null, description)) as description,count(description) as heigher,level_id FROM yourtablename WHERE 1 GROUP BY level_id";
$result = $conn->query($sql);
$arr =[];
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()){
$arr[]=$row;
}
}
<table>
<thead>
<tr>
<?php foreach ($arr as $key => $value): ?>
<th><?='level'.$value['level_id']?></th>
<?php endforeach; ?>
</tr>
</thead>
<tbody>
<?php
$arr = array_filter($arr,function($a=[]){
return $a['level_id'] != 0
}) //filter level not a zero
$h = max(array_map(function($a=[]){
return $a['heigher']; //filter array['heigher only']
},$arr)); // its get the heighest length of description value like [10,15,100]=>100
foreach ($arr as $key => $value){
$value['description'] = !empty($value['description']) ?explode(',',$value['description']):'';
$arr[$key]=$value;
}
?>
<?php for ($i=0; $i < $h[0]; $i++) {?>
<tr>
<?php foreach ($arr as $key => $value): ?>
<th><?=isset($value['description'][$i])? $value['description'][$i] :''?></th>
<?php endforeach; ?>
</tr>
<?php }?>
</tbody>
</table>