MySQLi join and display details differently from 2 tables - php

Question

Hello I have actually asked a similar question a while ago but only just realized I did not get an answer that solves my problem.
I have 2 tables in a MySQL DB, that are connected by the same main id, the following code is just a simplified example of the original code:
table1:
+-----------------------+
| main_id | name | type |
+-----------------------+
table2:
+----------------------------------------+
| main_id | secondary_id | color | price |
+----------------------------------------+
the result I want to achieve is to get every row of table 1, and under each one list all the linked by main id rows from table2, for example:
table1 rows:
+-------------------+
| 1 | name1 | type1 |
| 2 | name2 | type2 |
| 3 | name3 | type3 |
+-------------------+
table2 rows:
+----+------+----------+------+
| 1 | 23 | red | 500 |
| 1 | 24 | blue | 600 |
| 1 | 25 | green | 700 |
| 2 | 26 | pink | 400 |
| 2 | 27 | purple | 200 |
| 3 | 28 | white | 100 |
+----+------+----------+------+
result in display:
<h1 class="1">name1, type1</h1>
<div class="23">red,500</div>
<div class="23">red,500</div>
<div class="24">green,700</div>
<h1 class="2">name2, type2</h1>
<div class="25">pink,400</div>
<div class="26">purple,200</div>
And so on...I was using a while loop inside a while loop which wasn't giving me the required result, then I was advised to use MySQL JOIN, but when I do I get all values of the matching ids and cant display the headings only once and then list the related results under it, can someone please help me?
this is a simplified query i was using:
while($rows = $headings->fetch_array(MYSQLI_BOTH))
{
$id = $rows['id'];
$conts_q = $mysqli->query("SELECT * FROM `table2` WHERE id='$id'");
$conts_numr = $conts_q->num_rows;
if($conts_numr==0)
{
//Display empty
}
else
{
while($row2 = $conts_q->fetch_array(MYSQLI_BOTH))
{
//Get details and display
}
}
}

Answer 1

In your description, you use main_id, but in the code you use just id. Not sure which you're really using here - you will have to edit the code below to match your actual column names. If the database column name is actually main_id, then for instance the line with $id = $rows['id'] would have to be $rows['main_id']. Or it won't work.
while($rows = $headings->fetch_array(MYSQLI_BOTH))
{
echo '<h1 class="'.$rows['id'].'">'.$rows['name1'].', '.$rows['type'].'</h1>';
$id = $rows['id'];
$conts_q = $mysqli->query("SELECT * FROM `table2` WHERE id='$id'");
$conts_numr = $conts_q->num_rows;
if($conts_numr==0)
{
//Display empty
}
else
{
while($row2 = $conts_q->fetch_array(MYSQLI_BOTH))
{
if ($row2['id'] == $id) {
echo '<div class="'.$row2['secondary_id'].'">'.$row2['color'].', '.$row2['price'].'</div>';
}
}//while
}//else
}//while