database - How to get $id to delete in list item? -

i create function list_product show list product.

i want have button delete on each product on list products.

but can't $id delete.

have method delete rows on list database?

my function like:

<?php  function product_list() {     ?>     <div class="wrap">         <?php         global $wpdb;         $table_name = $wpdb->prefix . "product";         if (isset($_post['delete'])) {             $wpdb->query($wpdb->prepare("delete $table_name id = %s", $id));         } else {             $rows = $wpdb->get_results("select id,name $table_name");         }         ?>         <table>             <tr>                 <th>id</th>                 <th>name</th>             </tr>             <?php foreach ($rows $row) { ?>                 <tr>                     <td><?php echo $row->id; ?></td>                     <td><?php echo $row->name; ?></td>                     <td><a href="<?php echo admin_url('admin.php?page=product_update&id=' . $row->id); ?>">cập nhật</a></td>                     <td><input type='submit' name="delete" value='delete' class='button' onclick="return confirm('&iquest; confirm delete?')"></td>                 </tr>             <?php } ?>         </table>     </div>     <?php } 

thanks.

i not php expert think here going on.
not sending $id variable anywhere. also, there isn't form in code. since aren't using js submission, there isn't submission.

try following code.

<?php  function product_list() {     ?>     <div class="wrap">         <?php         global $wpdb;         $table_name = $wpdb->prefix . "product";         if(isset($_post['row_id'])){             $id = $_post['row_id'];             $id = $id[0];         }else{             $id = '';         }         if (isset($_post['delete'])) {             $wpdb->query($wpdb->prepare("delete $table_name id = %s", $id));         } else {             $rows = $wpdb->get_results("select id,name $table_name");         }         ?> <form method="post">         <table>             <tr>                 <th>id</th>                 <th>name</th>             </tr>             <?php foreach ($rows $row) { ?>                 <tr>                     <td><?php echo $row->id; ?></td>                     <td><?php echo $row->name; ?></td>                     <td><a href="<?php echo admin_url('admin.php?page=product_update&id=' . $row->id); ?>">cập nhật</a></td>                     <td>                         <input type="hidden" name="row_id[]" value="<?php echo $row->id; ?>">                         <input type='submit' name="delete" value='delete' class='button' onclick="return confirm('&iquest; confirm delete?')">                     </td>                 </tr>             <?php } ?>         </table> </form>     </div>     <?php }