รบกวนสอบถามการแปลงค่าตัวแปรจาก Java ไป PHP ด้วยครับ

<form action="" class="form" data-cesta-feira-form>     
                                        <input type="hidden" value="1" class="form-control" name="quantity" data-cesta-feira-attribute placeholder="Quantity"/>
                                        <input type="hidden" value="1" name="observations" data-cesta-feira-attribute placeholder="Observations"/>
                                        <input type="hidden" value="<?=$rowNew['name']; ?>" name="product_name" data-cesta-feira-attribute=""/>
                                        <input type="hidden" value="<?=$rowPriceN['dealer_price']; ?>" name="unity_price" data-cesta-feira-attribute/>
                                        <input type="hidden" value="<?=$rowNew['id']; ?>" data-cesta-feira-item-id />
                                        <input type="hidden" value="shoe" name="item_type" data-cesta-feira-attribute/>   
                                        
                                        <button type="submit" class="btn btn-primary" data-toggle="modal" data-target="#exampleModalCenter" data-id="<?php echo $rowNew["id"];?>"><span class="fa fa-shopping-basket"></span> สั่งซื้อ </button>
                                        
                                        <div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
                                            
                                            <div class="modal-dialog modal-dialog-centered" role="document">
                                                <div class="modal-content">
                                                    <div class="modal-header">
                                                        <input type="text" name="idp" id="idp"/>
                                              <?php
                                               $idGet = $_POST['idp'];

                                                $sqlP = "SELECT * FROM product WHERE id=$idGet";
                                                $resultP = $db->query($sqlP);
                                                $rowP = mysqli_fetch_array($resultP);
                                                
                                                $sqlI = "SELECT * FROM product_image_dealer WHERE product_id=#idp";
                                                $resultI = $db->query($sqlI);
                                                $rowI = mysqli_fetch_array($resultI);
                                                
                                                 //ข้อมูลราคา
                                                $sqlR = "SELECT * FROM product_price WHERE product_id=id";
                                                $resultR = $db->query($sqlR);
                                                $rowR = mysqli_fetch_array($resultR);
                                            ?>
                                                        <h6 class="modal-title text-primary" id="exampleModalLongTitle"><b>ระบบได้เพิ่มสินค้าลงในรถเข็นของท่านแล้ว!!!</b></h6>
                                                        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                                                            <span aria-hidden="true">&times;</span>
                                                        </button>
                                                    </div>
                                                    <div class="modal-body">
                                                        <div class="row">
                                                            <div class="col-4 col-sm-4 my-3" align="right"><img src="../productDealer/<?= $rowI['image']; ?>" alt="<?= $rowP['name']; ?>" class='img-thumbnail' width="95%"/></div>
                                                            <div class="col-8 col-sm-8" align="left">รายการสินค้าที่เพิ่มคือ
                                                                <hr/>
                                                                
                                                                - <b><?= $rowP['name'] ?></b><br/>
                                                                &nbsp;&nbsp;&nbsp;<b>ราคา &nbsp;<font class="text-danger"><?= $rowR['dealer_price']; ?></font>&nbsp;บาท</b>
                                                                <hr/>
                                                            </div>
                                                        </div>
                                                    </div>
                                                    <div class="modal-footer">
                                                        <button type="button" class="btn btn-secondary" data-dismiss="modal">สั่งซื้อสินค้าต่อ</button>
                                                        <button type="button" class="btn btn-primary">ดูรายการสั่งซื้อ</button>
                                                    </div>
                                                </div>
                                            </div>
                                        </div>
                                    </form>
<script type="application/javascript">
 $('#exampleModalCenter').on('show.bs.modal', function (event) {
                    var button = $(event.relatedTarget)
                    var id= button.data('id')
                    var modal = $(this)
                    modal.find('#idp').val(id)
                    })
                </script>