benjie php

foreach($sql as $row){
                  $variable[] = $row["ReservedQTY"];
                  echo "
                    <tr>
                      <td>".$row['brand_name']."</td>
                      <td>".$row['model_name']."</td>
                      <td>".$row['ReservedQTY']." /
                                <input type='number' max='100' min='0' name='quantity".$row['model_id']."'
                                  id='quantity".$row['model_id']."' class='".$row['model_id']."' value='0'
                                style='width: 60px; height: 30px;'>
                      </td>
                      <td>
                              <button type='button' id='add".$row['model_id']."' class='btn btn-default label-success'
                                onclick=\"addQty(".$row['model_id'].")\"><i class='fa fa-plus'></i>
                              </button>

                              <button type='button' id='minus".$row['model_id']."' class='btn btn-default label-danger'
                                onclick=\"minusQty(".$row['model_id'].")\"><i class='fa fa-minus'></i>
                              </button>
                      </td>
                    </tr>
                  ";
                }
                  // $sum = array_sum($variable);
                  // echo $sum;
              } catch (PDOException $e) {
                echo $e->getMessage();
              }
              echo "</tbody></table>";
              echo "<div class='modal-footer'><button class='btn btn-primary btn-sm edit btn-flat'
              data-sales_id='".$row['sales_id']."'><i class='fa fa-check'></i> Confirm</button></div>";
            }