Bootstrap卡 - PHP

I want to show my orders with Bootstrap Card, but I actually can't put all orders in separated card. I got for every row in mysql table new card. For example if I have 1 A 2 A 1 B 2 B 3 C

It will show me (1 A) (2 A) (1 B) (2 B) (3 C) but i want (1 A B) (2 A B) (3 C)

For demonstration i made screenshot from dummy values.

My code is:

<?php
        $sql = 'SELECT DISTINCT(tbl_orders.uid), article from tbl_orders ';
        $stmt = $conn -> prepare($sql);
        $stmt->execute();

        $sql1 = 'SELECT tbl_orders.article from tbl_orders GROUP BY tbl_orders.uid';
        $stmt1 = $conn -> prepare($sql1);
        $stmt1->execute();
        ?>


    <?php while ($row = $stmt -> fetch ()) {
        $red = $row['uid'];?>
    <div class="card">
        <h1><?php echo $row['uid']; ?></h1>
            <h2><?php echo $row['article'];?></h2>
        <h3><?php

            ?></h3>
    </div>
    <?php  }?>