如何附加ID以逗号分隔？

Question

I am building an E-commerce website and for my cart.php page I want to collect all the ids of the items which is added to cart and then send these ids through URL to my success.php so that here I can retrieve these ids and update my database status to confirmed for particular user. I tried using array for collecting ids but then i dont know how to write sql query to update table using array, i also tried implode() function but then i am getting error in query. I need code for collecting ids, sending these ids through URL, retrieving the ids, and query to update. My Code:

<?php
    $result = mysqli_query($con, $query);
    $num_rows = mysqli_num_rows($result);
    $ids = array();
    while ($num_rows > 0) { 
       $row = mysqli_fetch_array($result);
       $ids[] = $row['item_id'];
       $num_rows--;
    }
    $id = implode(', ', $ids);?>
    <td><a href="success.php?id=<?php echo $id; ?>" class="btn btn- 
    primary">Confirm Order</a></td>

Answer 1

Code to send the IDs

<?php
    $result = mysqli_query($con, $query);
    $num_rows = mysqli_num_rows($result);
    $ids=array();
    while ($num_rows > 0) { 
       $row = mysqli_fetch_array($result);
       $ids[]=$row['item_id'];
       $num_rows--;
    }
    $id= implode(',', $ids);?>
    <td><a href="success.php?id=<?php echo $id; ?>" class="btn btn- 
    primary">Confirm Order</a></td>

Code to update the DB using the IDs, based on the snippet you shared in the comments

<?php 
   $item_id=$_GET['id']; 
   $user_id=$_SESSION['id']; 
   $query="UPDATE users_items SET status='Confirmed' WHERE item_id='$item_id' AND user_id IN (".$item_id.")"; 
   // Debug-Query Formation: //echo $query;
   $result= mysqli_query($con, $query); 
?>

Hope this helps