Modifier une table

<section class="section section-lg section-inset-1 d-flex justify-content-center">

            <!-- afficher le dessert selectionner -->
            <?php
            
            if(isset($_GET['id_dessert']) AND !empty($_GET['id_dessert'])) {
                
                $getid = $_GET['id_dessert'];
                $recupProd = $bdd->prepare('SELECT * FROM desserts WHERE id_dessert = ? ');
                $recupProd->execute(array($getid));

                if($recupProd->rowCount() > 0){

                    $alldata = $recupProd->fetch();
                    $oldCarouDessert = $alldata['img_dessert'];

                } else {
                    ?> <style> .dessertmodife {display: none;} </style> <?php
                }
            } else {
                ?> <style> .dessertmodife {display: none;} </style> <?php
            }

            ?>

            <div class="dessertmodife mr-5">
                <form method="POST">
                    <h4>Desserts</h4>
                    <p>image carou : <img src="<?= $oldCarouDessert; ?>"></p>
                    <p name="imgprod"><?= $oldCarouDessert; ?></p>
                </form>
            </div>

            <!-- carousel -->
            <div>
                <h3>BDD : Carousel</h3>
                <br>
                <?php
                    /* carousel */
                $recupProd = $bdd->query('SELECT * FROM carousel');
                
                while ($valeurs = $recupProd->fetch())
                {
                ?>
                <div class="box-event-modern">
                    <div class="event-item-modern  overflow-auto">
                        <h4 style="margin: 1vh;"><?= $valeurs['id_carousel']; ?> : id du produit</h4>
                        <img src="<?= $valeurs['img_carou']; ?>" alt="">
                        <p class="event-time" style="overflow: auto;"><?= $valeurs['img_carou']; ?></p>
                        <div class="event-item-modern-text">
                            <p>Description : </p>
                            <form method="POST">
                                <p name="idCarou"><?= $valeurs['id_carousel']; ?></p>
                                <p class="h3 bg-green">Remplacer</p>
                                <input type="submit" name="modife_carou">
                            </form>
                        </div>
                    </div>
                </div>
                <?php
                }
                ?>
            </div>

            <?php
                if(isset($_POST['modife_carou'])) {

                    $updateprod = $bddeux->prepare('UPDATE carousel SET img_carou = '.$valeurs['img_carou'].' WHERE id_carousel = '.$valeurs['id_carousel'].'');
                    $updateprod->execute( $oldCarouDessert );

                    header('Location: produits.php');
                    exit;
                }
            ?>

        </section>