PHP MYSQL CONCAT

Question

I'm doing some voluntary work for a group of local businesses delivering food to vulnerable people during COVID.

An example of an order:

Order No |  Customer Name | Address | Quantity | Item Name | Notes
===================================================
 #1234     |     Freda Smith      |3 High St   |      1     |   Loaf Bread  | Wholemeal 
 #1234     |     Freda Smith      |3 High St   |      2     |   500ml Milk  | Skimmed
 #1234     |     Freda Smith      |3 High St   |      1     |   Tea         | Eng. Breakfast

I need to print all the details of order No #1234 onto one ticket, like this:

#1234, Freda Smith, 3 High St
     
1 X Loaf Bread, Wholemeal   
2 X 500ml Milk, skimmed  
1 X Tea, Eng. Breakfast

I have toyed with CONCAT and CONCAT_GROUP and have tried to figure out by separating the SELECT from the HTML formatting but can't get what I need. I'm close but no cigar!

EDIT:

SELECT IS:             $sql =    "SELECT id,
                       Order_Number, 
                       Full_Name,
                       Address,
                       Time_To_Deliver,
                CONCAT(Quantity, Item_Name, Notes)
                FROM orders
                CONCAT_GROUP BY Order_Number";
                    
            $users = $mysqli->query($sql);
            while($user = $users->fetch_assoc()){

Answer 1

Your current design has redundant data you should normalize your database structure by maintaining separate table for order & order items further more you can add a customer table also.

As per your current design you can loop through all of the rows and conditionally showing each order no. only once.

select id,
    order_number,
    full_name,
    address,
    time_to_deliver,
    quantity,
    item_name,
    notes
from orders
order by order_number asc

Here order by clause is important so that you will get an ordered list of items for each order. Once you have all the results from query you can loop through your data as

$currentParent = false;
while ($orderItem = $result->fetch_assoc()) {
   if ($currentParent != $orderItem['order_number']) {
        // display common detail of each order here
        echo '<h1>' . $orderItem['order_number'] .' '. $orderItem['full_name'] .' '. $orderItem['address']'</h1>';
        $currentParent = $orderItem['order_number'];
    }
    echo '<p>' . $orderItem['quantity'] .' '. $orderItem['item_name'] . ' '. $orderItem['notes'] .'</p>'; // here list rest of the information of order iterms 
    ...     
}

Generated markup will be like

<h1>#1234, Freda Smith, 3 High St</h1>
    <p>1 X Loaf Bread, Wholemeal</p>
    <p>2 X 500ml Milk, skimmed </p>
<h1>#1235, Freda Smith, 3 High St</h1>
    <p>1 X Tea, Eng. Breakfast</p>
//....

Although you can use aggregation with group_concat (see Query for post and tags in same query ) directly on database level but it has limitations of character limit which can be adjusted but not a good approach to follow when you can handle this type of situation at application layer